HD 161306: a radiatively interacting Be binary?

0433681 - ASÚ 2015 RIV FR eng J - Článek v odborném periodiku
Koubský, Pavel - Kotková, Lenka - Kraus, Michaela - Yang, S. - Šlechta, Miroslav - Harmanec, P. - Wolf, M. - Votruba, Viktor - Kubát, Jiří - Kubátová, Brankica - Niemczura, E. - Škoda, Petr
HD 161306: a radiatively interacting Be binary?
Astronomy & Astrophysics. Roč. 567, July (2014), A57/1-A57/4. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR(CZ) GA14-21373S; GA MŠMT LG14026
Grant ostatní: ESA(XE) ESA-PECS project no. 98058; GA ČR(CZ) GAP209/10/0715
Institucionální podpora: RVO:67985815
Klíčová slova: binaries: spectroscopic * stars: emission-line * Be: stars
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 4.378, rok: 2014

The spectrum of the Be star HD 161306 is shown to vary periodically with a period close to 100 days. The radial velocity of the He I 6678 A emission peak varying in antiphase to the radial velocity of the Halpha emission wings component suggests that the star is a binary similar to phi 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 phi 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, 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.
Trvalý link: http://hdl.handle.net/11104/0237856