Constraints on Evolutionary Models of the Ultracompact Binary 4U 1820-30 from Type I X-Ray Bursts

Astronomy and Astrophysics – Astronomy

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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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