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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
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
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
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)
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
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
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
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
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
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 It was an early compromise design soon superseded by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
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
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
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
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
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
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
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
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
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
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
−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
Programming variable that persists for the lifetime of the program
&'static lifetime annotation. Static variables date at least to ALGOL 60 (1960), where they are known as own variables: A declaration may be marked with
Static_variable
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
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
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
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
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
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 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
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
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
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
5.52 1.97 168 A3V suspected variable RR Lyn RR 44691 30651 06h 26m 25.86s +56° 17′ 06.2″ 5.53 0.93 271 A3m Algol variable, Vmax = 5.52m, Vmin = 6.03m
List_of_stars_in_Lynx
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)
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)
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
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 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
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 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
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
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
Star system in the constellation Ursa Major
to have a period of about 79 years. 65 Ursae Majoris A is a variable star with the variable star designation DN Ursae Majoris. The pair Aa1 and Aa2 form
65_Ursae_Majoris
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
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)
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
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
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
"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
Main sequence star that is more luminous and bluer than expected
List of blue straggler stars Algol variable – Class of eclipsing binary stars SX Phoenicis variable – Type of variable star Sandage, Allan (1953). "The
Blue_straggler
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
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
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
Variable star system in the constellation Ursa Major
Pulsation Spectrum of Mass-accreting Component of Algol-type system VV UMa", Information Bulletin on Variable Stars, 6148: 1, Bibcode:2015IBVS.6148....1G.
VV_Ursae_Majoris
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
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
Eclipsing binary star in the constellation Andromeda
drop to a magnitude of 13.07. This leads to its classification as an Algol variable star. The optical spectrum of QR Andromedae is not of a typical stellar
QR_Andromedae
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)
Variable star system in constellation Andromeda
to the naked eye under good conditions. The primary pair consists of an Algol type eclipsing binary system of two B-type main-sequence stars. Both components
V348_Andromedae
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
Triple star system in the constellation Hercules
orbital plane oriented near the line of sight to the Earth, making it an Algol-type eclipsing binary. They have an orbital period of just over two days
68_Herculis
Eclipsing binary in the constellation of Leo Minor
Coronae Borealis variable star, although its fading was unusually slow for an R Coronae Borealis variable. Because R Coronae Borealis variables fade repeatedly
AS_Leonis_Minoris
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
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
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)
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
Eclipsing binary star in the constellation Virgo
HW Virginis, abbreviated HW Vir, is an eclipsing binary system (of the Algol type), approximately 563 light-years away based on the parallax measured
HW_Virginis
"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
Set of rules for naming entities in source code and documentation
FORTRAN (1955) and ALGOL (1958), allowed spaces within identifiers, determining the end of identifiers by context. Keywords in ALGOL used stropping thus
Naming convention (programming)
Naming_convention_(programming)
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
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
Star in the constellation Andromeda
Andromedae (TW And) is an eclipsing binary star, classified also as an Algol variable star, in the constellation Andromeda. Its brightness varies with a period
TW_Andromedae
repeatedly. Various keywords are used to specify this statement: descendants of ALGOL use "for", while descendants of Fortran use "do". There are also other possibilities
Glossary_of_computer_science
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
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
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
Star in the constellation Orion
DN Orionis is an Algol variable located in the constellation of Orion. The primary star is a spectral type A0 star and the secondary is an evolved giant
DN_Orionis
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
Multiple star system in the constellation Sagittarius
of Dipper.) Mu Sagittarii A varies in brightness and is classified as a variable star. The two spectroscopic components eclipse each other with an orbital
Mu_Sagittarii
Catalogue of Variable Stars (GCVS4.2)". Retrieved 2012-04-03. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS database
List_of_stars_in_Auriga
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_Volans
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
"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
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
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
Star in the constellation Telescopium
BL Telescopii is a multiple star in the constellation Telescopium. An Algol-like eclipsing binary, the star system varies between apparent magnitudes
BL_Telescopii
de Données astronomiques de Strasbourg. Retrieved 2007-01-03. "AAVSO Website". American Association of Variable Star Observers. Retrieved 9 March 2014.
List_of_stars_in_Lacerta
System of two stars orbiting each other
Algol, a triple star system in the constellation Perseus, contains the best-known example of an eclipsing binary. Eclipsing binaries are variable stars
Binary_star
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)
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
Binary star in the constellation Libra
moving closer to the Sun with a radial velocity of −39 km/s. This is an Algol-like eclipsing binary star system, with a period of 2.3274 days and an eccentricity
Delta_Librae
Binary star in the constellation Puppis
showed this is an eclipsing binary system of the Algol type and an Alpha2 Canum Venaticorum variable. The period of both variations is the same, 4.74922 days
HD_66051
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
379 A4IV VX Psc; δ Sct variable 35 Psc 35 70 1061 1196 00h 14m 58.78s +08° 49′ 15.7″ 6.02 1.50 261 F0IV UU Psc; Algol variable 73 Psc 73 105 6386 5074
List_of_stars_in_Pisces
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_Scutum
Setting or re-setting the value associated with a variable name
and C). The second most commonly used notation is x := expr (originally ALGOL 1958, popularised by Pascal). Many other notations are also in use. In some
Assignment_(computer_science)
Triple star system in the constellation Tucana
unusual primary has a Wolf–Rayet spectrum and has produced a luminous blue variable (LBV) outburst; the secondary, also a Wolf–Rayet star, forms an eclipsing
HD_5980
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
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ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
ALGOL VARIABLE
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