New Insight into the FS CMa System MWC 645 from Near-Infrared and Optical Spectroscopy

0574032 - ASÚ 2024 RIV CH eng J - Journal Article
Torres, A.F. - Arias, M.L. - Kraus, Michaela - Mercanti, L. V. - Eenmae, T.
New Insight into the FS CMa System MWC 645 from Near-Infrared and Optical Spectroscopy.
Galaxies. Roč. 11, č. 3 (2023), č. článku 72. E-ISSN 2075-4434
R&D Projects: GA ČR(CZ) GA20-00150S
EU Projects: European Commission(XE) 823734 - POEMS
Institutional support: RVO:67985815
Keywords : stars * emission-line * Be stars
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 2.5, year: 2022
Method of publishing: Open access

We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 mu m and 2.3 mu m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the H alpha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.
Permanent Link: https://hdl.handle.net/11104/0344393