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In stellar astronomy, the Algol paradox is a paradoxical situation when elements of a binary star seem to evolve in discord with the established theories of stellar evolution.[1] A fundamental feature of these theories is that the rate of evolution of stars depends on their mass: The greater the mass, the faster this evolution, and the more quickly it leaves the main sequence, entering either a subgiant or giant phase.
In the case of Algol and other binary stars, something completely different is observed: The less massive star is already a subgiant, while the star with much greater mass is still on the main sequence. Since the partner stars of the binary are thought to have formed at approximately the same time and so should have similar ages, this appears paradoxical. The more massive star, rather than the less massive one, should have left the main sequence.
The paradox is resolved by the fact that in many binary stars, there can be a flow of material between the two, disturbing the normal process of stellar evolution. As the flow progresses, their evolutionary stage advances, even as the relative masses change. Eventually, the originally more massive star reaches the next stage in its evolution despite having lost much of its mass to its companion.
^Pustylnik, I. (1998). "The Early History of Resolving the Algol Paradox". Astronomical and Astrophysical Transactions. 15 (1–4): 357–362. Bibcode:1998A&AT...15..357P. doi:10.1080/10556799808201791. Retrieved 2012-07-09.
In stellar astronomy, the Algolparadox is a paradoxical situation when elements of a binary star seem to evolve in discord with the established theories...
an Am star, but this is now considered doubtful. Studies of Algol led to the Algolparadox in the theory of stellar evolution: although components of a...
thousand grains fall they do, thus many of nothing become something. Algolparadox: In some binary star systems the partners seem to have different ages...
stragglers, and type Ia supernovae. Mass transfer leads to cases such as the Algolparadox, where the most-evolved star in a system is the least massive. The evolution...
attained by single stars. Studies of the eclipsing ternary Algol led to the Algolparadox in the theory of stellar evolution: although components of a...
"Language and metalanguage." Revised Report on the Algorithmic Language Algol 68. Springer, Berlin, Heidelberg, 1976. 17-35. Hofstadter, Douglas. 1980...
As pointed out by Peter Landin's 1965 paper "A Correspondence between ALGOL 60 and Church's Lambda-notation", sequential procedural programming languages...
in the late 1950s LISP introduced zero-based numbering for arrays while Algol 58 introduced completely flexible basing for array subscripts (allowing...
JavaScript, Perl, and PHP. "NOT" is the operator used in ALGOL 60, BASIC, and languages with an ALGOL- or BASIC-inspired syntax such as Pascal, Ada, Eiffel...
Molnar; R. L. Mutel (1997). Close Approaches of Stars to the Oort Cloud: Algol and Gliese 710. American Astronomical Society 191st meeting. American Astronomical...
the sole use of lexically scoped variables to Lisp; an inspiration from ALGOL 68. CL supports dynamically scoped variables as well, but they must be explicitly...
No. 1, pp. 136-163, 1975. Koster , Cornelis H. A., "Affix Grammars," in ALGOL 68 Implementation, North Holland Publishing Company, Amsterdam, p. 95-109...
values were found to depend greatly on the programming language used with Algol needing the smallest and Fortran and Cobol needing the largest cache sizes...
Englewood Cliffs, New Jersey. R.W. Bemer (1969). A politico-social history of Algol, Annual Review in Automatic Programming, pp 151-237. Pergamon Press, Oxford...
have let expressions. Also, block structured programming languages like ALGOL and Pascal are similar in that they too allow the local definition of a...
affine type theory to control aliasing and other forms of interference in Algol-like programming languages. O'Hearn used bunched type theory to extend Reynolds'...
inherited let expressions from LCF. Stateful imperative languages such as ALGOL and Pascal essentially implement a let expression, to implement restricted...
in the same way as his father Shiryu defeated his predecessor, Perseus Algol, in Kurumada's manga. He later turned up alive in the Sanctuary, re-swearing...
technique was used and developed in the definition of the programming language ALGOL 68. It is an example of the larger class of affix grammars. In 1968, computer...
Peacy Eric Lindsay John Foyster Susan Wood, "Women and Science Fiction", Algol 33, 1978 John Bangsund, Parergon Papers 10, ANZAPA, October 1978 John McPharlin...
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