Subdwarf B binaries in the Edinburgh-Cape Survey
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0509284,
title = {Subdwarf B binaries in the Edinburgh-Cape Survey},
author = {L. Morales-Rueda and P. F. L. Maxted and T. R. Marsh and D. Kilkenny and D. O'Donoghue},
journal= {arXiv preprint arXiv:astro-ph/0509284},
year = {2007}
}
Comments
To appear in Baltic Astronomy. Proceedings of the Second Meeting on Hot Subdwarf Stars, La Palma, June 2005. Four pages, three figures