Radial Velocity Variable sdO/Bs from SPY - Preliminary Orbits of Three New Short Period Binaries

TL;DR

This paper reports preliminary orbital solutions for three short-period hot subdwarf binaries from the SPY project, indicating likely white dwarf or late main-sequence companions, with further observations needed for detailed characterization.

Contribution

First presentation of preliminary orbital parameters for three short-period sdO/B binaries from the SPY survey, highlighting the need for additional follow-up observations.

Findings

All binaries have short orbital periods.

Companions are likely white dwarfs or late main-sequence stars.

Further spectroscopy and light curve analysis are planned.

Abstract

We present new results from follow-up time-resolved spectroscopy of radial velocity variable hot subdwarfs from the SPY project. Medium resolution spectra were taken at the ESO NTT. Preliminary orbital solutions are presented for three single-lined sdO/B binaries. The orbital periods of all binaries are short and the companions are most likely white dwarfs or late main-sequence stars. Follow-up time-resolved spectroscopy is necessary to measure the orbital parameters with higher accuracy. Light curves should be taken in order to search for reflection effects and or eclipses.