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Monitoring evolved stars for binarity with the hermes spectrograph

Published online by Cambridge University Press:  25 February 2014

N. Gorlova ,
H. Van Winckel ,
J. Vos ,
R.H. Østensen ,
A. Jorissen ,
S. Van Eck  and
N. Ikonnikova
N. Gorlova
Affiliation:
Institute of Astronomy, KU Leuven, Belgium
H. Van Winckel
Affiliation:
Institute of Astronomy, KU Leuven, Belgium
J. Vos
Affiliation:
Institute of Astronomy, KU Leuven, Belgium
R.H. Østensen
Affiliation:
Institute of Astronomy, KU Leuven, Belgium
A. Jorissen
Affiliation:
Institute of Astronomy and Astrophysics, ULB, Belgium
S. Van Eck
Affiliation:
Institute of Astronomy and Astrophysics, ULB, Belgium
N. Ikonnikova
Affiliation:
Sternberg Astronomical Institute, Russia
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Abstract

Binarity is often invoked to explain peculiarities that can not be explained by the standard theory of stellar evolution. Detecting orbital motion via the Doppler effect is the best method to test binarity when direct imaging is not possible. However, when the orbital period exceeds length of a typical observing run, monitoring often becomes problematic. Placing a high-throughput spectrograph on a small semi-robotic telescope allowed us to carry out a radial velocity survey of various types of peculiar evolved stars. In this review we highlight some findings after the first four years of observations. Thus, we detect eccentric binaries among hot subdwarfs, barium, S stars, and post-AGB stars with disks, which are not predicted by the standard binary interaction theory. In disk objects, in addition, we find signs of the on-going mass transfer to the companion, and an intriguing line splitting, which we attribute to the scattered light of the primary.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 64: Setting a New Standard in the Analysis of Binary Stars , 2013 , pp. 163 - 170
Copyright
© EAS, EDP Sciences, 2014

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