Properties of hot subdwarfs in the GALEX survey
Peter Nemeth, Adela Kawka, Stephane Vennes
TL;DR
This study analyzes hot subdwarfs from the GALEX survey, determining their physical properties and companion incidence using model atmospheres and spectral analysis, providing insights into their composition and binary nature.
Contribution
It presents a comprehensive analysis of hot subdwarfs' atmospheric parameters and companion incidence based on a large GALEX sample, with preliminary CNO abundance constraints.
Findings
Determined temperature, gravity, and helium abundance for 181 hot subdwarfs.
Estimated the incidence of companions similar to solar-type stars.
Provided preliminary CNO abundance constraints.
Abstract
We have analyzed a sample of hot subdwarfs (sdB, sdO) selected from the GALEX ultraviolet sky survey. Applying a model atmosphere analysis we determined the temperature, surface gravity, and helium-to-hydrogen abundance ratio, and obtained preliminary constraints on the CNO abundance for a sample of 181 stars. Adopting colourimetric (ultraviolet-infrared) and quantitative spectral decomposition we also investigated the incidence of solar type or earlier (A, F, G) companions.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · History and Developments in Astronomy