Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1711c&link_type=abstract
American Astronomical Society, HEAD meeting #7, #17.11; Bulletin of the American Astronomical Society, Vol. 35, p.626
Astronomy and Astrophysics
Astronomy
Scientific paper
Evolutionary models for ultracompact binaries such as 4U 1820-30 predict either a pure helium or hydrogen-poor (mass fraction of hydrogen X ˜ 0.1) secondary. For 4U 1820-30, I discuss the expected properties of Type I X-ray bursts in each case, and compare to observations. I show that the presence of hydrogen significantly affects the burst recurrence time when X>0.03, and CNO mass fraction >1/10 solar. The conclusions are sensitive to the accretion rate: the observed 2-4 hour recurrence times are reproduced for a pure helium companion if ˙ M=8-11x 10-9\ Msun\ yr-1, or a hydrogen poor companion if ˙ M=4-7x 10-9\ Msun\ yr-1. I compare this result to evolutionary models, and go on to discuss the expected carbon production and superburst properties in each case.
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