EDP Sciences
Free access
Volume 413, Number 1, January I 2004
Page(s) 323 - 327
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20031577

A&A 413, 323-327 (2004)
DOI: 10.1051/0004-6361:20031577

Physical parameters of helium-rich subdwarf B stars from spectral energy distributions

A. Ahmad and C. S. Jeffery

Armagh Observatory, College Hill, Armagh BT61 9DG., N. Ireland, UK
(Received 15 July 2003 / Accepted 2 October 2003)

We present effective temperatures and angular radii for eleven helium-rich subdwarf B stars. These are measured using spectral energy distributions from archival IUE spectra and existing optical and infrared photometry. The data have been analysed using a grid of high-gravity helium-rich LTE model atmospheres and a $\chi^2$-minimization procedure. The parameters derived here allow for independent verification of the parameters derived from the analysis of optical spectra.

Key words: stars: chemically peculiar -- stars: early-type -- subdwarfs -- stars: atmospheres -- stars: fundamental parameters

Offprint request: A. Ahmad, amir@star.arm.ac.uk

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