| Issue |
A&A
Volume 368, Number 3, March IV 2001
|
|
|---|---|---|
| Page(s) | 994 - 1005 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010068 | |
| Published online | 15 March 2001 | |
Physical parameters of sdB stars from spectral energy distributions*
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Corresponding author: R. Aznar Cuadrado, This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
21
July
2000
Accepted:
4
January
2001
Abstract
The atmospheric parameters of 34 hot subdwarf B stars have been obtained
using a combination of 61 short and long-wave IUE spectra, together with
new and existing optical and infrared photometric data. Using a grid of
high-gravity helium-deficient model atmospheres and a 
-minimization
procedure, 15 single sdB stars and 19 composite systems, containing a hot
subdwarf B star and a cool main-sequence companion, were analyzed. From the
(
-
) diagram of our results, we conclude
that the majority of the cool companions to our sample of binary sdB
stars are main sequence stars, in the range of 4000 
6000 and mass 
/
. The lower limit on detectability
of cool stars in composite sdB of our sample is ~3600 K,
corresponding to a spectral type of M1 or later (Lang [CITE]).
Key words: stars: formation, early-type, subdwarfs, fundamental parameters (luminosities, temperatures) / binaries: spectroscopic
Based on observations made with the Jacobus Kapteyn Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, and on INES data obtained with the IUE satellite.
© ESO, 2001
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