Recent Progress in Finding Binary Systems with the B[e] Phenomenon
Miroshnichenko A.S. Zharikov S.V. Manset N. Khokhlov S.A. Nodyarov A.S. Klochkova V.G. Danford S. Kuratova A.K. Mennickent R. Chojnowski S.D. Raj A. Bisht D.
February 2023MDPI
Galaxies
2023#11Issue 1
This paper describes recent studies of the FS CMa-type objects, a group of stars showing the B[e] phenomenon defined in 2007. The objects exhibit strong emission-line spectra with both permitted and forbidden lines suggesting the presence of a B-type star as well as strong IR excesses due to radiation of circumstellar dust. These properties are hard to explain in the framework of the evolution of single stars with luminosities between ~300 and ~30,000 L⊙ typical of most B-type stars. We explore the hypothesis that the gaseous-and-dusty envelopes of FS CMa objects are due to either earlier or ongoing mass transfer between the binary system components. It is hard to detect the secondary components in these systems because of veiling and distortions by the circumstellar matter because of the relative faintness of the companions. Nevertheless, we detected regular radial velocity variations of the spectral lines in MWC 728, 3 Pup, and AS 386 and we found absorption lines typical of cool stars in the spectra of MWC 645, AS 174, and several other objects. The diversity of the secondary components in FS CMa objects is discussed in the context of non-conservative binary evolution.
binary system , circumstellar matter , emission-line stars , spectroscopy
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Department of Physics and Astronomy, University of North Carolina at Greensboro, Greensboro, 27402, NC, United States
Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, St. Petersburg, 196140, Russian Federation
Fesenkov Astrophysical Institute, Observatory, 23, Almaty, 050020, Kazakhstan
Faculty of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Ave., 71, Almaty, 050040, Kazakhstan
Instituto de Astronomía, Universidad Nacional Autónoma de Mexico, AP 106, BC, Ensenada, 22800, Mexico
Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnyj Arkhyz, Zelenchukskiy Region, Karachai-Cherkessian Republic, 369167, Russian Federation
Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Hwy, Kamuela, 96743, HI, United States
Departamento de Astronomía, Universidad de Concepción, Concepción, 4030000, Chile
Department of Physics, Montana State University, Bozeman, 59717, MT, United States
Indian Centre for Space Physics, 466 Barakhola, Netai Nagar, 700099, India
Department of Physics and Astronomy
Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo
Fesenkov Astrophysical Institute
Faculty of Physics and Technology
Instituto de Astronomía
Special Astrophysical Observatory of the Russian Academy of Sciences
Canada-France-Hawaii Telescope Corporation
Departamento de Astronomía
Department of Physics
Indian Centre for Space Physics
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