Subdwarf B Stars from the ESO Supernova Ia Progenitor Survey -- Observation versus Theory

Lisker, T., Heber, U., Napiwotzki, R., Christlieb, N., Han, Z., Homeier, D. and Reimers, D. (2005) Subdwarf B Stars from the ESO Supernova Ia Progenitor Survey -- Observation versus Theory. In: UNSPECIFIED.

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We present the analysis of a high-quality sample of optical spectra for 76 sdB stars from the ESO Supernova Ia Progenitor Survey. Effective temperature, surface gravity, and photospheric helium abundance were derived from line profile fits. We demonstrate that our subsample of 52 single-lined sdB stars is a useful tool to compare observation and theory. The predictions of population synthesis models for close binary evolution are compared to our data. We show that the simulations cover the observed parameter range of sdBs, but fail to reproduce the observed distribution in detail.

Item Type	Conference or Workshop Item (Other)
Additional information	Original paper can be found at: http://www.astrosociety.org/pubs/cs/328.html--Copyright Astronomical Society of the Pacific
Date Deposited	15 May 2025 16:18
Last Modified	04 Feb 2026 00:15