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Class of eclipsing binary stars
Algol variables or Algol-type binaries are a class of eclipsing binary stars that are similar to the prototype member of this class, β Persei (Beta Persei
Algol_variable
Eclipsing variable star in the constellation Perseus
constellation of Perseus and one of the first non-nova variable stars to be discovered. Algol is a three-star system, consisting of Beta Persei Aa1, Aa2
Algol
Family of programming languages
ALGOL (/ˈælɡɒl, -ɡɔːl/; short for "Algorithmic Language") is a family of imperative computer programming languages originally developed in 1958. ALGOL
ALGOL
Member of the ALGOL family of computer programming languages
ALGOL 60 (short for Algorithmic Language 1960) is a member of the ALGOL family of computer programming languages. It followed on from ALGOL 58 which had
ALGOL_60
Programming language
to ALGOL 68. ALGOL 68 features include expression-based syntax, user-declared types and structures/tagged-unions, a reference model of variables and
ALGOL_68
Star whose brightness fluctuates, as seen from Earth
first documented periodic variable was the eclipsing binary Algol. The periodic variable Omicron Ceti, later named Mira, was discovered in the 17th century
Variable_star
Quintuple star system in the constellation Ursa Major
The first pair of stars, J093010A, is a detached eclipsing binary (an Algol variable). The two stars within J093010A orbit with a period of about 1.3 days
1SWASP_J093010.78+533859.5
Type of variable star
Beta Cephei variables, also known as Beta Canis Majoris stars, are variable stars that exhibit small rapid variations in their brightness due to pulsations
Beta_Cephei_variable
Programming language
ALGOL 58, originally named IAL, is a member of the ALGOL family of computer programming languages. It was an early compromise design soon superseded by
ALGOL_58
Svolopoulos, Sotirios (1988). "Spectral types of 80 early-type stars of variable radial velocity". Astronomical Society of the Pacific. 100: 828. Bibcode:1988PASP
List_of_stars_in_Cancer
−00° 17′ 56.7″ 2.20 -5.8 916 B0III+O9V component of the Mintaka system; Algol variable, Vmax = 2.20m, Vmin = 2.32m, P = 5.73 d ι Ori ι 44 37043 26241 05h 35m
List_of_stars_in_Orion
Catalogue of Variable Stars (GCVS4.2)". Retrieved 10 April 2012. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS
List_of_stars_in_Cassiopeia
Paradox in astronomy
much of its mass to its companion. Algol variable Pustylnik, I. (1998). "The Early History of Resolving the Algol Paradox". Astronomical and Astrophysical
Algol_paradox
3.31 −1.84 349 M3III Propus, Praepes, Tejat Prior; semiregular and Algol variable, Vmax = 3.15m, Vmin = 3.9m, P = 232.9 d ξ Gem ξ 31 48737 32362 06h 45m
List_of_stars_in_Gemini
Star system in the constellation Perseus
Lindemann Award from the Astronomische Gesellschaft. He classified it as an Algol variable and found a period of 13.196 days. Enebo refined the period to 13.1989
RW_Persei
2012-02-27. Retrieved 2010-07-16. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014. "Naming Stars". Retrieved 13 December
List_of_stars_in_Scorpius
Constellation in the northern celestial hemisphere
system is the prototype of a group of eclipsing binary stars named Algol variables, though it has a third member to make up what is actually a triple
Perseus_(constellation)
Topics referred to by the same term
Look up Algol or ALGOL in Wiktionary, the free dictionary. Algol is a star system. Algol or ALGOL may also refer to: Algol variable or Algol-type binaries
Algol_(disambiguation)
Algol variable in the constellation Chamaeleon
colleagues. Four years later, the system was found to be an Algol variable and was given the variable star designation RZ Chamaeleontis in 1974. J. Andersen
HD_93486
Programming variable that persists for the lifetime of the program
allocated as required at run time. Static variables date at least to ALGOL 60 (1960), where they are known as own variables: A declaration may be marked with
Static_variable
Computer programming, a variable only usable in a portion of a program (the scope)
variables. On the other hand, many ALGOL-derived languages allow any number of nested levels of visibility, with private variables, functions, constants and types
Local_variable
Open cluster in the Orion Nebula in the constellation Orion
37020, V1016 Orionis Algol variable B West X-ray source N/A COUP 766, MAX 97 B B1V 5 41 Orionis B, HD 37021, BM Orionis Algol variable B East X-ray source
Trapezium_Cluster
Triple star system in the constellation Scutum
astronomiques de Strasbourg. Retrieved 2025-09-04. "FR Scuti". International Variable Star Index. AAVSO. Retrieved 2025-10-07. Pantaleoni González, M.; Maíz
FR_Scuti
Multiple star system in the constellation of Auriga
Light Changes of Epsilon Aurigae), where he suggested the star was an Algol variable and an eclipsing binary. The first hypothesis, set forth in 1937 by
Epsilon_Aurigae
Triple star system in constellation Draco
HD 139319 is a ternary system composed of the binary Algol variable star known as TW Draconis, and a main-sequence companion star at a separation of 3
HD_139319
Description of an algorithm that resembles a computer program
syntax sources include Fortran, Pascal, BASIC, C, C++, Java, Lisp, and ALGOL. Variable declarations are typically omitted. Function calls and blocks of code
Pseudocode
Catalogue of Variable Stars (GCVS4.2)". Retrieved 4 April 2012. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS
List_of_stars_in_Canis_Major
Programming language dialect
The Interactive ALGOL 68 is a structured, imperative high-level computer programming language, a dialect of, and compiler for, ALGOL 68. It was made available
Interactive_ALGOL_68
Variable masking one with the same name
rules of the language. One of the first languages to introduce variable shadowing was ALGOL, which first introduced blocks to establish scopes. It was also
Variable_shadowing
Binary star in the constellation Capricornus
be from coronal activity in the secondary star. Delta Capricorni A is an Algol-type eclipsing binary star, with an orbital period of 1.022768 days and
Delta_Capricorni
Star in the constellation of Cygnus
and weaker lines of HeI and CIV. WR 134 is classified as an Algol type eclipsing variable and given the designation V1769 Cygni, but the variation is
WR_134
Programming language based on a proposal for ALGOL X
ALGOL W is a programming language. It is based on a proposal for ALGOL X by Niklaus Wirth and Tony Hoare as a successor to ALGOL 60. ALGOL W is a relatively
ALGOL_W
Binary star system in the northern constellation of Auriga
system is believed to be a stream member of the Ursa Major Moving Group. Algol Capella Alsephina van Leeuwen, F. (November 2007), "Validation of the new
Beta_Aurigae
Archived from the original on 2012-02-27. Retrieved 2010-07-16. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014.
List_of_stars_in_Monoceros
Type of variable stellar binary
regarded[by whom?] as a subtype of the Algol variables; however, their light curves differ (the eclipses of Algol variables are much more sharply defined). On
Beta_Lyrae_variable
Catalogue of Variable Stars (GCVS4.2)". Retrieved 2012-04-08. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS database
List_of_stars_in_Carina
Constellation split into two non-contiguous parts
IC 4756, is an Algol variable eclipsing binary with a 5.70 day period. The primary star in the system is also a Delta Scuti variable, undergoing multiple
Serpens
Constellation in the northern celestial hemisphere
days. Even further north is FL Lyrae, a much fainter 9th-magnitude Algol variable that drops by half a magnitude every 2.18 days during the primary eclipse
Lyra
Star system in the constellation Sagittarius
et al. (April 2011), "Mass loss out of close binaries. The formation of Algol-type systems, completed with case B RLOF", Astronomy & Astrophysics, 528
V356_Sagittarii
Star in the constellation Aquila
Strasbourg. Retrieved 2018-03-08. Heintze, J.R.W.; Hoekzema, Nico (1989). "The Algol-Type Binary QS AQL". International Astronomical Union Colloquium. 107: 344–345
QS_Aquilae
Programming variable in which memory is allocated at runtime
Garbage Collection for Algol 68." Algol 68 Implementation. 1970. Price, Ana M. de A. (February 1984). "Defining dynamic variables and abstract data types
Dynamic_variable
Star system in the constellation Perseus
velocity of about −12 km/s. In 1905 this system was found to be an Algol variable by Lidiya Tseraskaya. K. Graff determined a period of 0.84943 days.
RT_Persei
Triple star system in constellation Hercules
HD 165590 is a quintuple system dominated by the binary Algol variable star known as V772 Herculis. The system lies in the constellation of Hercules about
HD_165590
Main sequence star that is more luminous and bluer than expected
Blue straggler stars Star portal Algol variable – Class of eclipsing binary stars SX Phoenicis variable – Type of variable star Sandage, Allan (1953). "The
Blue_straggler
Computer programming language
S-algol (St Andrews Algol) is a computer programming language derivative of ALGOL 60 developed at the University of St Andrews in 1979 by Ron Morrison
S-algol
Sparse open cluster in the constellation of Lyra
through space, it may be associated with the Gould Belt. It includes an Algol variable star, BD+36° 3317, discovered in 2007 from Spain: this is a spectroscopic
Delta_Lyrae_cluster
Strasbourg. Retrieved 2007-01-04. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014. E.B Knobel – On a catalogue of
List_of_stars_in_Lyra
Star in the constellation Chamaeleon
observations revealed that one of the components as a δ Scuti variable. RS Cha is an Algol-type eclipsing binary ranging from 6.02 to 6.58 or 6.68 within
HD_75747
Programming language
the ALGOL 60 language. Wirth was involved in the process to improve the language as part of the ALGOL X efforts and proposed a version named ALGOL W. This
Pascal_(programming_language)
"Identification of a Constellation from a Position". Retrieved 2006-12-26. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014.
List_of_stars_in_Sagitta
Binary star in the constellation Cepheus
the large cool primary star. The timing and duration of the eclipses is variable, although the exact onset is difficult to measure because it is gradual
VV_Cephei
Programming language construct specifying an identifier's properties
see below. Declarations are particularly prominent in languages in the ALGOL tradition, including the BCPL family, most prominently C and C++, and also
Declaration (computer programming)
Declaration_(computer_programming)
Topics referred to by the same term
Gerard Kuiper, including: KUI 91AB, a variable star of Delta Cephei type KUI 93AB, an eclipsing binary of Algol variable type Kui (Chinese mythology) 夔, a
Kui
Algol-type eclipsing binary star in the constellation Corona Borealis
U Coronae Borealis (U CrB) is an Algol-type eclipsing binary star system in the constellation Corona Borealis. Its apparent magnitude varies between 7
U_Coronae_Borealis
Type of star
the given magnitudes are in the V-band. Also a Beta Cephei variable Also an Algol variable Also a shell star Huang, L.; Guo, Z.; Hao, J.; Percy, J. R
Slowly_pulsating_B-type_star
Imperative computer programming language
ALGOL 68C is an imperative computer programming language, a dialect of ALGOL 68, that was developed by Stephen R. Bourne and Michael Guy to program the
ALGOL_68C
Part of a computer program where a given name binding is valid
of ALGOL 60. Representative language specifications follow: ALGOL 60 (1960) The following kinds of quantities are distinguished: simple variables, arrays
Scope_(computer_programming)
Star system in the constellation Cassiopeia
AR Cassiopeiae (AR Cas) is a variable star in the constellation of Cassiopeia. It is thought to be a member of a septuple star system, one of only two
AR_Cassiopeiae
Binary star in the constellation Cygnus
V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally
Y_Cygni
Binary star in the constellation Aquarius
to be an Algol-type eclipsing binary based on photometric observations made with the Hipparcos space observatory. It was assigned the variable-star designation
LL_Aquarii
Demarcated group of source code statements that run in sequence
development of the first autocodes, and was formalized in the Algol 58 and Algol 60 reports. Algol 58 introduced the notion of the "compound statement", which
Block_(programming)
Catalogue of Variable Stars (GCVS4.2)". Retrieved 2012-07-12. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS database
List_of_stars_in_Cepheus
N. N.; Durlevich, O. V.; et al. (2004). "Combined General Catalogue of Variable Stars (GCVS4.2)". Retrieved 2007-01-03. Gould, B. A. "Uranometria Argentina"
List_of_stars_in_Crux
370 B3V + A Bibing, Sadr al Tauri, Pectus Tauri; eclipsing binary; Algol variable ε Tau ε 74 28305 20889 04h 28m 36.93s +19° 10′ 49.9″ 3.53 0.15 155 K0III
List_of_stars_in_Taurus
de Données astronomiques de Strasbourg. Retrieved 2007-01-02. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014.
List of stars in Corona Borealis
List_of_stars_in_Corona_Borealis
3.80 0.91 123 K0III variable ο1 Cyg ο1 31 V695 192577 99675 20h 13m 37.90s +46° 44′ 28.8″ 3.80 −4.29 1353 K2II+... Algol variable η Cyg η 21 188947 98110
List_of_stars_in_Cygnus
ALGOL 68RS is the second ALGOL 68 compiler written by I. F. Currie and J. D. Morrison, at the Royal Signals and Radar Establishment (RSRE). Unlike the
ALGOL_68RS
Star in the constellation Boötes
star in the northern constellation of Boötes. It has been identified as an Algol-type eclipsing binary, although subsequent observations do not confirm this
HD_126200
B4V Slowly pulsating B variable V397 Pup 195 V397 63786 38167 07h 49m 14.65s −35° 14′ 35.9″ 5.94 0.11 478 B9V Algol variable HR 2759 76 56410 35054 07h
List_of_stars_in_Puppis
Triple star system in the constellation Taurus
broad-band linear polarimetry of early-type binaries: II. Variable, phase-locked polarization in triple Algol-type system λ Tauri" (PDF), Astronomy & Astrophysics
Lambda_Tauri
Conditional operator in computer programming
conditional expressions with two, three, or more clauses. Languages following ALGOL-like syntax often support them with the same syntax as conditional statements
Ternary_conditional_operator
Binary star in the constellation Aquarius
orbital plane of the two stars lies near the line of sight, so they form an Algol-type eclipsing binary. The first component of the system is an A-type main-sequence
29_Aquarii
Range of mainframe computers in the 1960s and 70s
in the family was the B5000 in 1961, which was optimized for compiling ALGOL 60 programs extremely well, using single-pass compilers. The B5000 evolved
Burroughs_Large_Systems
110 U 156247 84500 17h 16m 31.72s +01° 12′ 38.1″ 5.89 −0.46 606 B5Vnn Algol variable 179 G. Oph 179 162774 87491 17h 52m 35.46s +01° 18′ 18.2″ 5.91 0.75
List_of_stars_in_Ophiuchus
Variable star in the constellation Cygnus
O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep
V380_Cygni
Catalogue of Variable Stars (GCVS4.2)". Retrieved 30 July 2012. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS
List_of_stars_in_Triangulum
Variable star in the constellation Musca
GT Muscae, also known as 12 Muscae, is a variable star about 400 light years from the Earth, in the constellation Musca. It is a 5th magnitude star, so
GT_Muscae
Programming language feature
supporting functions as result types (e.g. ALGOL 60, Pascal) or omitting nested functions and thus non-local variables (e.g. C). The early functional language
First-class_function
Variable star in the constellation Ara
R Arae is an Algol-type eclipsing binary in the constellation Ara. Located approximately 298 parsecs (970 ly) distant, it normally shines at magnitude
R_Arae
Triple star system in the constellation Vela
magnitudes of 2.33 and 3.44., making this the brightest known eclipsing variable. The precise orbits allow a dynamical parallax of 39.8±0.4 mas to be derived
Delta_Velorum
2012-02-27. Retrieved 2010-07-16. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014. "Naming Stars". Retrieved 13 December
List_of_stars_in_Vela
Method in computer language design
– for example allowing a variable named if without clashing with the keyword if. Stropping is primarily associated with ALGOL and related languages in
Stropping_(syntax)
Overview of the scientific field of astronomy
Alpha² Canum Venaticorum variable SX Arietis Pulsar Eclipsing binary Algol variable Beta Lyrae variable W Ursae Majoris variable Supernova Classes Type
Outline_of_astronomy
Section of code that details a specific command
subroutines. assignment Fortran: variable = expression Pascal, Algol 60, Ada: variable := expression; C, C#, C++, PHP, Java: variable = expression; call Fortran:
Statement_(computer_science)
−0.48 248 G4III... Algol variable 48 Per c 48 MX 25940 19343 04h 08m 39.67s +47° 42′ 45.3″ 3.96 −2.19 553 B3Ve MX Per; γ Cas variable ξ Per ξ 46 24912 18614
List_of_stars_in_Perseus
Catalogue of Variable Stars (GCVS4.2)". Retrieved 2 April 2012. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS
List_of_stars_in_Ara
Star system in the constellation Taurus
ultra-compact binary system of the AM CVn type. "NLTT 11748". International Variable Star Index. AAVSO. Retrieved 2010-05-14. Vallenari, A.; et al. (Gaia collaboration)
NLTT_11748
Gravitationally-binding region around a star in a binary system
contact, but they have changed substantially by the point this happens. Algol variables are the result of such situations. AE early overtaking Similar to AS
Roche_lobe
Triple star system in the constellation Cygnus
visible companion is a 7th-magnitude B5 main sequence star. 31 Cygni A is an Algol-type eclipsing binary and ranges between magnitudes 3.73 and 3.89 over a
31_Cygni
Catalogue of Variable Stars (GCVS4.2)". Retrieved 3 April 2012. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS
List_of_stars_in_Aries
Variable star in the constellation Ursa Major
subdwarf O star, borderline white dwarf. It is classified as a detached Algol variable and ranges in brightness from an apparent visual magnitude of 14.8 down
BE_Ursae_Majoris
Binary star system in the constellation Cetus
variable star discovered, with the possible exception of Algol. It is the prototype of the Mira variables. The system lies at a distance of 300 light-years (92
Mira
"Identification of a Constellation from a Position". Retrieved 2006-12-26. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014.
List_of_stars_in_Ursa_Minor
Star in the constellation Perseus
RY Persei is a variable star in the northern constellation of Perseus, abbreviated RY Per. It is an Algol variable with a period of 6.8635663 days, which
RY_Persei
Catalogue of Variable Stars (GCVS4.2)". Retrieved 8 April 2012. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS
List_of_stars_in_Capricornus
Triple star system in the constellation Auriga
components of this pair form an eclipsing binary system. This make AR Aurigae a variable star, with its brightness varying from magnitude +6.15 to +6.82 with a
AR_Aurigae
"General Catalog of Variable Stars (GCVS database, version 2012Apr)". Retrieved 2013-03-24. "AAVSO Website". American Association of Variable Star Observers
List_of_stars_in_Chamaeleon
"Identification of a Constellation from a Position". Retrieved 2006-12-26. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014.
List_of_stars_in_Vulpecula
Eclipsing binary star in the constellation Aquila
14256825, also known as V1828 Aquilae, is an eclipsing binary system (of the Algol type) in the constellation of Aquila. The system comprises a subdwarf O
NSVS_14256825
Eclipsing binary star of Algol type in the constellation Auriga
EO Aurigae is an eclipsing binary of Algol type in the northern constellation of Auriga. With a combined apparent magnitude of 7.71, it is too faint to
EO_Aurigae
ALGOL VARIABLE
ALGOL VARIABLE
Girl/Female
Biblical
According to variable songs or tunes.
Surname or Lastname
English
English : from the Middle English personal name Algod, Alegod, Halgod, of Scandinavian origin. Compare Old Danish Algot, from an unattested Alf-gautr ‘elf Goth’ or A{dh}al-gautr ‘noble Goth’.
Surname or Lastname
English
English : topographic name for someone living on (and farming) a hide of land, Old English hī(gi)d. This was a variable measure of land, differing from place to place and time to time, and seems from the etymology to have been originally fixed as the amount necessary to support one (extended) family (Old English hīgan, hīwan ‘household’). In some cases the surname is habitational, from any of the many minor places named with this word, as for example Hyde in Greater Manchester, Bedfordshire, and Hampshire.English : variant of Ide, with inorganic initial H-. Compare Herrick.Jewish (American) : Americanized spelling of Haid.
Boy/Male
Scandinavian
Surname.
Girl/Female
Swedish
Pearl.
Boy/Male
Anglo, Australian, British, English, French, Swedish
Variable; Brave with the Spear; Spear Rule
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : habitational name from Saint-Hilaire-du-Harcouët in La Manche, which gets its name from the dedication of its church to St. Hilary, or alternatively from either of the places, in La Manche and Somme, called Saint-Lô. Both of the latter are named from a 6th-century St. Lauto, bishop of Coutances; his name is of variable form in the sources and uncertain etymology.North German : habitational name for someone from Sandel.Jewish (eastern Ashkenazic) : occupational name for a cobbler or shoemaker, Yiddish sandler (from Hebrew sandelar, from Late Latin sandalarius, an agent derivative of sandalium ‘shoe’).
Boy/Male
Anglo, British, English
Variable
Biblical
according to variable songs or tunes,
Surname or Lastname
English
English : from a medieval male personal name (from Latin Hilarius, a derivative of hilaris ‘cheerful’, ‘glad’, from Greek hilaros ‘propitious’, ‘joyful’). The Latin name was chosen by many early Christians to express their joy and hope of salvation, and was borne by several saints, including a 4th-century bishop of Poitiers noted for his vigorous resistance to the Arian heresy, and a 5th-century bishop of Arles. Largely due to veneration of the first of these, the name became popular in France in the forms Hilari and Hilaire, and was brought to England by the Norman conquerors.English : from the much rarer female personal name Eulalie (from Latin Eulalia, from Greek eulalos ‘eloquent’, literally well-speaking, chosen by early Christians as a reference to the gift of tongues), likewise introduced into England by the Normans. A St. Eulalia was crucified at Barcelona in the reign of the Emperor Diocletian and became the patron of that city. In England the name underwent dissimilation of the sequence -l-l- to -l-r- and the unfamiliar initial vowel was also mutilated, so that eventually the name was considered as no more than a feminine form of Hilary (of which the initial aspirate was in any case variable).
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE