期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 480, 期 1, 页码 320-344出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1747
关键词
circumstellar matter; stars: early-type; stars: massive; supergiants; stars: winds, outflows
资金
- CONICYT
- Programa de Astronomia/PCI
- FONDO ALMA 2014 [31140024]
- GACR [14-21373S, 17-02337S]
- European Union European Regional Development Fund, project 'Benefits for Estonian Society from Space Research and Application' (KOMEET) [2014 - 2020. 4. 01. 16 - 0029]
- Estonian Ministry of Education and Research [IUT40-1]
- Ministry of Education, Youth and Sports [LG14013]
- Agencia de Promocion Cientifica y Tecnologica [Prestamo BID PICT 2016/1971]
- CONICET [PIP 0177]
- Universidad Nacional de La Plata (Programa de Incentivos), Argentina [G11/137]
- project CONICYT
- PAI/Atraccion de capital humano avanzado del extranjero [PAI80160057]
- Centro de Astrofisica de Valparaiso
- National Aeronautics and Space Administration
- National Science Foundation
- National Science Foundation (United States)
- National Research Council (Canada)
- CONICYT (Chile)
- Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina)
- Ministerio da Ciencia, Tecnologia e Inovacao (Brazil)
- [RVO: 67985815]
B[e] supergiants arc luminous evolved massive stars. The mass-loss during this phase creates a complex circumstellar environment with atomic, molecular, and dusty regions usually found in rings or disc-like structures. For a better comprehension of the mechanisms behind the formation of these rings, detailed knowledge about their structure and dynamics is essential. To address that, we obtained high-resolution optical and near-infrared (near-IR) spectra for eight selected Galactic B[e] supergiants, for which CO emission has been detected. Assuming Keplerian rotation for the disc, we combine the kinematics obtained from the CO bands in the near-IR with those obtained by fitting the forbidden emission [OI]):lambda 5577, [OI] lambda lambda 6300,6363, and [Ca II] lambda lambda 7291,7323 lines ill the optical to probe the disc structure. We find that the emission originates from multiple ring structures around all B[e] supergiants, with each one of them displaying a unique combination of rings regardless of whether the object is part of a binary system. The confirmed binaries display spectroscopic variations of their line intensities and profiles as well as photometric variability, whereas the ring structures around the single stars are stable.
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