Spectroscopic binaries among AGB stars from HERMES/Mercator: the case of V Hya

Abstract

We report on our search for spectroscopic binaries among a sample of AGB stars. Observations were carried out in the framework of the monitoring of radial velocities of (candidate) binary stars performed at the Mercator 1.2m telescope, using the HERMES spectrograph. We found evidence for duplicity in UV Cam, TU Tau, BL Ori, VZ Per, T Dra, and V Hya. This short communication focus on V Hya, found to behave like RV Tau of the b subtype, which are binaries surrounded by a disc.

Poster presented at IAU Symp. 343 "Why Galaxies Care About AGB Stars", Vienna, august 2018