Intriguing detection of (CO)-C-12 molecular emission in a classical Be star

0547819 - ASÚ 2022 RIV FR eng J - Journal Article
Cochetti, Y.R. - Arias, M. C. - Kraus, Michaela - Cidale, L.S. - Torres, A.F. - Granada, A. - Maryeva, Olga
Intriguing detection of (CO)-C-12 molecular emission in a classical Be star.
Astronomy & Astrophysics. Roč. 647, March (2021), č. článku A164. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GA20-00150S; GA ČR(CZ) Ga18-05665S
EU Projects: European Commission(XE) 823734 - POEMS
Institutional support: RVO:67985815
Keywords : spectroscopic techniques * circumstellar matterstars * emission-line
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.240, year: 2021
Method of publishing: Open access with time embargo
https://doi.org/10.1051/0004-6361/202040143

Our goal is to study the evolution of the disks around peculiar B stars through the variability of their physical properties and dynamical structure, as well as to set constraints on different models and disk forming mechanisms. Throughout the last decade, we have carried out temporal monitoring of a sample of objects in the near infrared using spectroscopic facilities at the Gemini and Las Campanas Observatories. In the present work, we focus on the classical Be star 12 Vul, for which also optical spectra have been collected quasi-simultaneously.Results. We observed variability in the hydrogen line profiles of 12 Vul, attributed to dissipating and building-up processes of the circumstellar envelope. Also, we found that this Be star presented the (CO)-C-12 band heads in emission in one observation. The emission of this molecule has not been previously reported in a Be star, while it is a common feature among B[e] stars. We obtained parameters to describe the (CO)-C-12 emitting region and propose different scenarios to explain this intriguing emission.
Permanent Link: http://hdl.handle.net/11104/0323983