V1294 Aql = HD 184279: A bad boy among Be stars or an important clue to the Be phenomenon?

0564025 - ASÚ 2023 RIV FR eng J - Journal Article
Harmanec, P. - Božić, H. - Koubský, Pavel - Yang, S. - Ruzdjak, D. - Sudar, D. - Šlechta, Miroslav - Wolf, M. - Korčáková, D. - Zasche, P. - Oplištilová, A. - Vrsnak, D. - Ak, H. - Eenens, P. - Bakis, H. - Bakis, V. - Otero, S. - Chini, R. - Demsky, T. - Barlow, B. N. - Svoboda, P. - Jonák, J. - Vitovský, K. - Harmanec, A.
V1294 Aql = HD 184279: A bad boy among Be stars or an important clue to the Be phenomenon?
Astronomy & Astrophysics. Roč. 666, October (2022), č. článku A136. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR GD205/08/H005
Grant - others:GA ČR(CZ) GAP209/10/0715; GAČR(CZ) GA205/06/0304
Institutional support: RVO:67985815
Keywords : midterm spectroscopic variations * long-term * shell stars
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access

A reliable determination of the basic physical properties and variability patterns of hot emission-line stars is important for understanding the Be phenomenon and ultimately, the evolutionary stage of Be stars. This study is devoted to one of the most remarkable Be stars, V1294 Aql = HD 184279. We collected and analysed spectroscopic and photometric observations covering a time interval of about 25 000 d (68 yr). We present evidence that the object is a single-line 192.9 d spectroscopic binary and estimate that the secondary probably is a hot compact object with a mass of about 1.1-1.2 M-circle dot. We found and documented very complicated orbital and long-term spectral, light, and colour variations, which must arise from a combination of several distinct variability patterns. Attempts at modelling them are planned for a follow-up study. We place the time behaviour of V1294 Aql into context with variations known for some other systematically studied Be stars and discuss the current ideas about the nature of the Be phenomenon.
Permanent Link: https://hdl.handle.net/11104/0337606