Epsiodic mass transfer in binaries with X-ray heating

Details Epsiodic mass transfer in binaries with X-ray heating Epsiodic mass transfer in binaries with X-ray heating

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..283h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 1, p. 283-287

Astronomy and Astrophysics

Astrophysics

21

Mass Transfer, Periodic Variations, Radiant Heating, Stellar Evolution, X Ray Binaries, X Ray Spectra, Accretion Disks, Computerized Simulation, Eddington Approximation

Scientific paper

The evolution of low-mass X-ray binary (LMXB) systems is investigated with X-ray heating of the secondary star included in the calculations. We take into account shielding of the secondary star from X-radiation by the accretion disk via an ad hoc prescription. The effects of X-ray heating and the removal of mass from the secondary are calculated in detail. The evolution of the secondary exhibits a quasi-periodic behavior, where a cycle starts with an interval of a few hundred years with a very high rate of mass loss (approximately 10-6 - 10-5 solar mass/yr), during which approximately 10-4 - 4 x 10-3(solar mass is removed from the secondary. Each large mass transfer event is followed by a longer quiescent interval (approximately 3 x 105/yr), during which the secondary underfills its Roche lobe. This is in turn followed by an even longer interval (approximately 1.5 x 106 yr) with a moderate average rate of mass transfer (approximately 10-9 solar mass/yr) which actually consists of a series of short episodes (1-1000 yr) of mass transfer at rates of 10-7 - 10-5 solar mass/yr. During these latter episodes, 3 x 10-6 - 10-4 solar mass are lost from the secondary. The length of this third part of the cycle, with lower average mass transfer rates, increases systematically as the evolution progresses. To help validate our findings, the stellar evolution code was tested by varying the length of the integration time step; the results were found to be qualitatively unchanged by such variations.

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