Spectroscopic Analysis of sdB Binaries from the SPY Project

Details Spectroscopic Analysis of sdB Binaries from the SPY Project Spectroscopic Analysis of sdB Binaries from the SPY Project

2005-12-15

arxiv.org/abs/astro-ph/0512388v1

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, to be published in Proceedings of the Second Meeting on Hot Subdwarf Stars and Related Objects, La Palma,

Scientific paper

In the course of our search for double degenerate binaries as potential progenitors of type Ia supernovae with the ESO VLT (ESO SN Ia Progenitor SurveY SPY) several new subdwarf B (sdB) binaries with sdB primary components were discovered. In this paper, we present detailed analyses of six radial velocity variable sdB stars. Radial velocity curves have been measured. From the mass functions we derive lower limits to the masses of the unseen companions and we discuss their nature. In addition, stellar parameters like effective temperatures, surface gravities and helium abundances were determined as well as metal abundances.

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