| Issue |
A&A
Volume 567, July 2014
|
|
|---|---|---|
| Article Number | A57 | |
| Number of page(s) | 4 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/201424022 | |
| Published online | 10 July 2014 | |
Research Note
HD 161306: a radiatively interacting Be binary?⋆,⋆⋆
1
Astronomical Institute, Academy of Sciences of the Czech
Republic,
Fričova 298,
251 65
Ondřejov,
Czech Republic
e-mail:
koubsky@sunstel.asu.cas.cz
2
Department of Physics and Astronomy, University of
Victoria, Victoria BC
V8W 3P6,
Canada
3
Department of Theoretical Physics and Astrophysics, Masaryk
University, Kotlářská
2, 611 37
Brno, Czech
Republic
4 Astronomical Institute of the Charles University, Faculty of
Mathemathics and Physics, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
5
University of Wrocław, Astronomical Institute,
Kopernika 11, 51-622
Wrocław,
Poland
Received: 17 April 2014
Accepted: 29 May 2014
The spectrum of the Be star HD 161306 is shown to vary periodically with a period of ~100 days. The radial velocity of the He i 6678 Å emission peak varying in antiphase to the radial velocity of the Hα emission wings component suggests that the star is a binary similar to φ Per, 59 Cyg, or FY CMa, i.e. a radiatively interacting Be binary – a rare case among Be stars. This type of object is also called a φ Per-type binary or Be + sdO binaries. The range of radial-velocity variations of the strong emission peak in the helium line observed in HD 161306 is about 180 km s-1, similar to what is observed for these systems. We therefore conclude that HD 161306 may represent another case of a Be star with a hot subdwarf companion.
Key words: binaries: spectroscopic / stars: emission-line, Be / stars: individual: HD 161306
Based on observations obtained with the Perek 2-m Telescope at Ondřejov Observatory, Czech Republic, and with the 1.22-m Telescope of the Dominion Astrophysical Observatory, Canada. This work made use of the BeSS database, operated at LESIA, Observatoire de Meudon, France.
The spectra taken in Ondřejov (Hα and helium regions) are only available in electronic form (FITS format) at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/567/A57
© ESO, 2014
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