Algol
From LoveToKnow 1911
ALGOL, the Arabic name (signifying "the Demon") of ,6 Persei, a star of the second magnitude, noticed by G. Montanari in 1669 to fluctuate in brightness.
Algol star
A type of eclipsing binary, named after the prototype, Algol, that has periods of constant or near-constant brightness between minima, indicating that the two stars form a close binary of the detached or semidetached kind.
Algol
Related Category: Astronomy: Stars
(l´gl), famous variable star in the constellation Perseus; Bayer designation &bgr; Persei; 1992 position R.A. 3h07.7m, Dec. +40°55&minut;. Algol's variation in apparent magnitude, from 2.06 to 3.
ALGOL (short for ALGOrithmic Language) is a family of imperative computer programming languages originally developed in the mid 1950s which became the de facto standard way to report algorithms in print for almost the next 30 years.
Algol variables or Algol type binaries are a class of eclipsing binary stars.
Algol 3
Larger labelled image of Pleiades.
Algol A is a blue-white star
that is larger, brighter, and
hotter than Sirius A, like six
of the brightest stars of the
Pleiades Cluster at left.
Algol is a three star system containing an eclipsing binary pair. According to Burnham Algol is one of the most famous variable stars in the sky.
Algol
Algol is actually two stars. Star A is separated from close companion B by less than one tenth of the Earth-Sun distance, and partially eclipses every 2.9 days.
Click on image for star map
© Jens Dengler, reproduced with permission.
Algol A variable star of a class known as eclipsing variables. Algol's brightness fluctuates every 69 hours as it is eclipsed by its invisible companion.
Algol
( Per) (a) The most famous eclipsing binary, Algol was probably the first variable star discovered. It lies in the constellation Perseus and consists of two stars that orbit each other every 2.87 days.
Algol, β (beta) Persei, is 93 light years away and is known as the Demon Star (from the Arabic Al Ra's al Ghul).
Algol is known as the "demon star". It is probably the most famous star in the Perseus constellation.
Algol means "the ghoul" in Arabic. Think of Ra's Al Ghul from Batman(comics and movies).
Algol is located 93 light years from Earth and is visible to the naked eye in the constellation Perseus.
Algol is an eclipsing spectroscopic binary star, in fact a triple star system, and one of the first variables found in the sky. It is 92.8 light-years distant from Earth.
ALGOL
Algol (Beta Persei) is a star in the Perseus. Algol was the first known star. It has a magnitude that ranges from 2.1 to 3.4; the period is 2.9 days.
ALGOL
Algol (Beta Persei) is a star in the constellation Perseus. Algol was the first known eclipsing binary star. It has a magnitude that ranges from 2.1 to 3.4; the period is 2.9 days.
Algol is one of the best known eclipsing binaries, the first such star to be discovered, and also one of the first variable stars in general to be discovered. Algol's magnitude changes regularly between 2.3 and 3.
Algol variables undergo eclipses with one or two minima separated by periods of nearly constant light. The prototype of this class is Algol in the constellation Perseus.
Beta Lyrae variables ...
see Algol. [H76]
Dendrite
A branching crystal with a tree-like structure. [DC99] ...
Dartmouth ALGOL 30 was an implementation, firstly of ALGOL 58, then of ALGOL 60 for the LGP-30 at Dartmouth College, hence the name.
Beta Persei (Algol) is a notable EA type eclipsing binary, changing from 2.12 to 3.39 every 2.8673 days (2d, 20h 48m 56s) as the companion eclipses the primary. The eclipse lasts roughly ten hours.
Silver Saint Algol
Origin of the constellation: Ancient Greece (Ptolemaeus)
Named stars: Alpha Per (Algenib/Mirfak), Beta Per (Algol), ...
At 48x it showed elongated, two-lobed structure. After this catching M34 off Algol (bPer) was a snap at 8:32pm. Even 10x50 binoculars resolved this loose open cluster. So far nine Messiers found and two missed.
Perseus, the home of Algol, the Double Cluster, and the Alpha Persei cluster (which marks the Perseus OB3 Association of hot, massive O and B stars), ...
1672 - Geminiano Montanari notices that Algol's brightness varies
1686 - Gottfried Kirch notices that Chi Cygni's brightness varies ...
The eclipsing binary beta Per, called Algol is one of the most famous variable stars in the sky. The two stars revolve each other every 2 days and 21 hours. During the eclipsing phase the brightness varies from 2.2 mag to 3.5 mag.
Astronomers believe that Algol started off as a detached binary. For reference, let us label the component that is now the 0.8"solar mass subgiant as star 1 and the 3.7"solar mass main-sequence star as star 2.
Algol Beta Persei
Algorab Delta Corvi
Alhajoth Alpha Aurigae
Alhena Gamma Geminorum
Alioth Epsilon Ursae Majoris
Alkaid Eta Ursae Majoris
Al Kurud Theta Columbae
Al Kalb al Rai Rho-2 Cephei
Alkalurops Mu Bootis
Al Kaphrah Chi Ursae Majoris ...
The star Algol in the constellation Perseus is typical. Algol is a double star composed of one bright and one comparatively faint component with an orbit in a plane almost exactly in the line of sight from earth.
The star that Ptolemy called ‘the bright one in the Gorgon head' is Beta Persei, named Algol from the Arabic ra's al-ghul meaning ‘the demon's head'.
The first eclipsing binary detected was Algol, β Perseus, also known as the Demon star possibly due to its changing brightness.
Within the constellation is the star Algol, the "demon star". Algol is variable star which changes its brightness every 2.87 days. To the ancients this star was the head of Medusa, who even after death winked at them.
Algol is a common example of this kind of binary star. Binary stars which do not eclipse one another may have variable stellar spectra caused by the Doppler effect as they orbit around one another, and are called spectroscopic binaries.
At the age of eighteen, Goodricke demonstrated that Algol (known as the Winking Demon) was in fact an eclipsing variable, the first one to be discovered.
Goodricke presented his findings to the Royal Society in a paper memorably entitled: ...
In addition to taking pretty pictures of celestial and local objects, you can search for trails from moving objects (meteors, satellites, airplanes), and look for variable stars, such as the eclipsing binary Algol in Perseus.
the Rapid Burster First discovery of X-ray from an highly magnetic WD binary system, AM Her Discovery of X-ray from Algol and HZ 43. Precise location of about 60 X-ray sources Survey of the Soft X-ray background (0.1-0.28 kev) ...
Beta Per is the eclipsing binary Algol. Perseus was a hero in Greek mythology who killed the monstrous Medusa. Each year in August, the Perseid meteor shower radiates from this constellation's northern part.
Examples of binaries are Algol (an eclipsing binary), Sirius, and Cygnus X-1 (of which one member is probably a black hole).
Eclipsing binaries may therefore be detected by brightness variations of the binary system. The most famous are beta Persei (Algol), which varies from 3.4 to 2.1 over 2.87 days, and gamma Persei, which varies by three magnitudes over 14 years.
blocks the light of its companion as it passes in front of the latter, as observed from Earth. Each time this happens, the brightness of the entire system fluctuates. Such an eclipsing variable is perhaps best exemplified by the binary star Algol, ...
one star will pass in front of the other producing what we call eclipsing binary. It can be treated as a special kind of visual binary. Eclipsing binary systems are variable stars (see below). The following is a typical eclipsing binary, Algol.
 See also: Star, Light, Orbit, Magnitude, Constellation
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