Ultra-compact (X-ray) binaries

Details Ultra-compact (X-ray) binaries Ultra-compact (X-ray) binaries

2006-05-30

arxiv.org/abs/astro-ph/0605722v1

Astronomy and Astrophysics

Astrophysics

To appear in proceedings of "A life with stars" a conference in honour of Ed van den Heuvel's 60th birthday, New Ast. Rev

Scientific paper

A short review of ultra-compact binaries, focused on ultra-compact X-ray binaries, is followed by a discussion of recent results of our VLT campaign to obtain optical spectra of (candidate) ultra-compact X-ray binaries. We find evidence for carbon/oxygen as well as helium/nitrogen discs and no evidence for (traces) of hydrogen. This suggests that the donors in the observed systems are white dwarfs. However, we also find large differences between the two C/O discs of which we have good spectra, which highlights the need for a better understanding of the optical spectra.

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