Binary properties of subdwarfs selected in the GALEX survey

TL;DR

This study identifies and analyzes binary star systems among bright subdwarfs from the GALEX survey, revealing new binaries and pulsations through radial velocity and photometric observations.

Contribution

It presents new binary detections among subdwarfs and demonstrates the effectiveness of combined radial velocity and photometric methods.

Findings

Identified new binary systems among subdwarfs.

Detected long-period pulsations in some binaries.

Provided radial velocity data for multiple objects.

Abstract

We describe our programme to identify and analyse binary stars among the bright subdwarfs selected in the Galaxy Evolution Explorer (GALEX) survey. Radial velocity time-series helped us identify subdwarfs with low-mass or compact stellar companions: We describe work conducted on the bright binaries GALEX J0321+4727 and GALEX J2349+3844, and we present a radial velocity study of several objects that include three new likely binaries. We also carried out photometric observations that allowed us to detect long period pulsations in the subdwarf components in two of the close binaries.