Long-term, orbital, and rapid variations of the Be star V923 Aql = HD 183656

0550189 - ASÚ 2022 RIV FR eng J - Journal Article
Wolf, M. - Harmanec, P. - Božić, H. - Koubský, Pavel - Yang, S. - Ruždjak, D. - Šlechta, Miroslav - Ak, H. - Bakış, H. - Bakış, V. - Oplištilová, A. - Vitovský, K.
Long-term, orbital, and rapid variations of the Be star V923 Aql = HD 183656.
Astronomy & Astrophysics. Roč. 647, March (2021), č. článku A97. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : spectroscopic binaries * emission-line * early-type stars
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.240, year: 2021
Method of publishing: Open access with time embargo
https://doi.org/10.1051/0004-6361/202039740

We present the latest results of a long-term observational project aimed at observing, collecting from the literature, and homogenising the light, colour, and spectral variations of the well-known emission-line Be star V923 Aql. Our analysis of these parameters confirms that all of the observables exhibit cyclic changes with variable cycle length between about 1800 and 3000 days, so far documented for seven consecutive cycles. We show that these variations can be qualitatively understood within the framework of the model of one-armed oscillation of the circumstellar disk, with a wave of increased density and prograde revolution in space. We confirm the binary nature of the object with a 214.716 day period and estimate the probable system properties. We also confirm the presence of rapid light, and likely also spectral changes. However, we cannot provide any firm conclusions regarding their nature. A quantitative modelling study of long-term changes is planned as a follow-up to this work.
Permanent Link: http://hdl.handle.net/11104/0325973