The evolution of ultrashort period binary systems

Details The evolution of ultrashort period binary systems The evolution of ultrashort period binary systems

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..231n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 1, 1986, p. 231-240.

Astronomy and Astrophysics

Astrophysics

107

Binary Stars, Stellar Evolution, Stellar Mass Ejection, Abundance, Cataclysmic Variables, Helium, Hydrogen, Mass Transfer, Radii, X Ray Binaries

Scientific paper

A discussion is presented concerning the results of detailed evolutionary calculations in which a very low mass and hydrogen-depleted semiattached binary star containing a collapsed object can reach an exceptionally short orbital period while sustaining a relatively high mass transfer rate. The observed properties of such systems can be understood under the assumption that they contain moderately to severely hydrogen-defficient secondary stars that are neither fully degenerate nor burning He. It is noted that for extremely hydrogen-depleted stars, the assumption of chemical homogeneity becomes untenable. Attention is given to the binary systems 4U 1626-67, 4U 1916-05, and G61-29.

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