Subdwarf B binaries in the Edinburgh-Cape Survey

Details Subdwarf B binaries in the Edinburgh-Cape Survey Subdwarf B binaries in the Edinburgh-Cape Survey

2005-09-12

arxiv.org/abs/astro-ph/0509284v1

Astronomy and Astrophysics

Astrophysics

To appear in Baltic Astronomy. Proceedings of the Second Meeting on Hot Subdwarf Stars, La Palma, June 2005. Four pages, three

Scientific paper

We give an update of the results of a campaign to obtain orbital solutions of subdwarf B stars from the Edinburgh-Cape survey (Stobie et al. 1997). To date we have obtained blue spectra of 40 subdwarf B stars from the Edinburgh-Cape catalogue using the grating spectrograph at the 1.9m Radcliffe telescope at the South African Astronomical Observatory. We find that 17 out of these 40 are certain binaries with a few other objects showing radial velocity variations of small amplitude. The binary fraction found in our sample, after correcting for our binary detection efficiency, is 48%. We have secured the orbital parameters for 4 of the 17 systems and narrowed down the orbits of another 7 to a small range of periods.

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