Spectroscopy of the massive interacting binary UU Cassiopeiae

0559174 - ASÚ 2023 RIV FR eng J - Journal Article
Hadrava, Petr - Cabezas, Mauricio - Djurašević, G. - Garces, J. - Gorda, S. Y. - Jurkovic, M. - Korčáková, D. - Markov, H. - Mennickent, R.E. - Petrovic, J. - Vince, I. - Zharikov, S.V.
Spectroscopy of the massive interacting binary UU Cassiopeiae.
Astronomy & Astrophysics. Roč. 663, July (2022), č. článku A8. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GA22-34467S
Institutional support: RVO:67985815
Keywords : binaries * eclipsing * spectroscopic stars
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access with time embargo
https://doi.org/10.1051/0004-6361/202142545

In order to study the physics of the accretion process in greater detail, along with the structure and dynamics of the circumstellar matter in the system, we supplement our previous results obtained from photometry with an analysis of the spectra of UU Cas. We collected all available spectra used in previous publications on UU Cas and we acquired new ones. The method of disentangling was applied to this set of spectra spanning the years 2008-2021. The orbital parameters were disentangled and a fit of the separated component spectra by synthetic ones has been used to determine the physical parameters of the component stars. We compared the results to models of the evolution of interacting binaries. We found that in addition to the dominant role of the donor star and a weak contribution of the gainer, the line profiles are strongly influenced by the circumstellar matter. The absorption lines reveal a presence of a disk wind emanating above the orbital plane. The variability of H alpha emission yields evidence of changes in the structure of the circumstellar matter on a timescale of several orbital periods.
Permanent Link: https://hdl.handle.net/11104/0332722