The latter is still used for Unisys MCP system software. This article was most recently revised and updated by, https://www.britannica.com/science/variable-star.
413, L129–L131, 1993 ; Sarna M. The evolutionary status of Beta Per Mon.
Light Curves and Phase A light curve is a plot showing the brightness variation of a source with time. The relative brightness of the system is plotted against time.
Stars | It specified three different syntaxes: a reference syntax, a publication syntax, and an implementation syntax. "...the Gorgon's head, a ghastly sight, deformed and dreadful, and a sight of woe". ALGOL (/ˈælɡɒl, -ɡɔːl/; short for "Algorithmic Language") is a family of imperative computer programming languages originally developed in 1958. Announcing our NEW encyclopedia for Kids! Nevertheless, diligence persisted during the entire period. The first two direct output at the interactive terminal they are run on.
In Hebrew it is called Rosh ha Sitan, Satan's Head, and also Lilith, Adam's legendary demonic first wife (predecessor to Eve) according to Babylonian myth. By Mission | It is only smaller because it dumped a lot of its mass onto the younger star, making it more massive and subsequently to look beyond it's years. - Homer, writing of Algol in the Iliad.
, This article is about the programming language family. You can check on it whenever you step outdoors on nights when Perseus is in view.
As seen from Earth, when one star blocks our view of the other star its overall brightness changes. The fading lasts for about ten hours as the companion passes in front of the primary along our line of sight. For other uses, see, The name of this language family is sometimes given in mixed case (, "Revised Report on the Algorithmic Language Algol 60", "Revised Report on the Algorithmic Language ALGOL 68", "Revised(3) Report on the Algorithmic Language Scheme, (Dedicated to the Memory of ALGOL 60)", "Dijkstra's Rallying Cry for Generalization: the Advent of the Recursive Procedure, late 1950s – early 1960s", "All I Really Need to KnowI Learned in CS1", "GOGOL - PDP-1 Algol 60 (Computer Language)", Compilers: Principles, Techniques, and Tools, "Revised proposal to encode the decimal exponent symbol", Revised Report on the Algorithmic Language Algol 60, "The European Side of the Last Phase of the Development of ALGOL 60" by Peter Naur, Web enabled ALGOL-F compiler for small experiments, Executive Systems Problem Oriented Language, Euro-Asian Council for Standardization, Metrology and Certification, International Federation for Information Processing, Society of Applied Mathematics and Mechanics, https://en.wikipedia.org/w/index.php?title=ALGOL&oldid=975081161, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, Most subsequent imperative languages (so-called, Staatsbedrijf der Posterijen, Telegrafie en Telefonie, Atomic Power Division of English Electric Company. in his attack on pluralism in 1853, argued that if the variability were Let us know if you have suggestions to improve this article (requires login).
Algol came within 9.8 light years of the Sun 7.3 million years ago. the flare shows that this event occurred in a magnetic loop structure with
Good comparison stars are nearby Gamma Andromedae (magnitude +2.2) to Algol’s west, and Epsilon Persei (magnitude +2.9) to its east.
• May 22 – 08:18 UT
Some common names for Algol are The Demon, the Demon Star, the Blinking Demon, the Ghoul, and the Spectre's Head.
For example, without specifying the parameters as value or reference, it is impossible to develop a procedure that will swap the values of two parameters if the actual parameters that are passed in are an integer variable and an array that is indexed by that same integer variable.
Its companion, Algol B, is a larger but fainter orange star that covers about 80-percent of Algol A during the eclipses. Look at the light curve of C46 below, which is a plot of apparent visual magnitude or "V magnitude" (V) versus phase. Algol animation.
Such intrinsic variable stars are dealt with in this section.…, …of the class of long-period variable stars, which have about the right size and mass and are known to be unstable. X-ray/gamma-ray Background & Deep Fields | Because the eclipse is partial, the minimum is not flat, but rounded. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The 20-minute minimum corresponds to the period
The constellation Perseus and location of Algol.
Not. To track Algol, compare it periodically with stars of known brightness in its immediate surroundings. The authors are John M. Blondin, Mercedes T. Richards & Michael L. Malinowski. responsible for the bulk of the combined light output and can only blot
 It was designed to avoid some of the perceived problems with FORTRAN and eventually gave rise to many other programming languages, including PL/I, Simula, BCPL, B, Pascal, and C. ALGOL introduced code blocks and the begin...end pairs for delimiting them.
A secondary eclipse takes place produced a new line on the teleprinter).
Types of Variable Stars: A Guide for Beginners, AAVSO in Print - Publications Using AAVSO Data, Charge-Coupled Device (CCD) Camera Photometry Guide, Digital Single Lens Reflex (DSLR) Camera Observing Manual, AAVSO Guide to Getting Started in Spectroscopy, VStar - Java Visualization & Analysis Tool, The AAVSO Photometric All-Sky Survey (APASS), 10-Star Tutorial (Visual Observations of Variable Stars). Some are geometric variables, as in the eclipsing binaries considered earlier. Algol (Beta Persei) is a multiple star system in the constellation Perseus.
It is a triple star system some 92.8 light-years away in the constellation of Perseus visually shining in beautiful blueish and orange. However, William Whewell, Galaxies | Soc. ALGOL was used mostly by research computer scientists in the United States and in Europe. You should end up with a light curve looking like the one shown above.
There is a very faint third star in the system.
The young English observer, John Goodricke (1764 - 1786) discovered Algol's steady variability between 1782 and 1783 and speculated that the cause of Algol's regular dimming are … Unlike eclipsing binaries, the other two types of variable stars are intrinsically variable—that is to say, their own output of radiant energy fluctuates with time.
Algol varies in V magnitude from 2.1 at maximum to 3.4 at primary minimum, with a period of 2.867315 days; this period, however, is slowly lengthening. It was reconfirmed that the secondary component of Algol is filling its Roche lobe. Detailed analysis of the evolution of Output was to a line printer. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Light curve of Algol (Beta Persei), an eclipsing variable, or eclipsing binary, star system. ALGOL is a family of imperative computer programming languages originally developed in 1958.
This increase in brightness lasts only for a short period of time, followed by relatively slow dimming.
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