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The luminous B[e] binary AS 381

А. С. МирошниченкоRitter Observatory, Dept. of Physics & Astronomy, University of Toledo, Toledo, OH 43606-3390, USAK. S. BjorkmanRitter Observatory, Dept. of Physics & Astronomy, University of Toledo, Toledo, OH 43606-3390, USAЕ. Л. ЧенцовSpecial Astrophysical Observatory of the Russian Academy of Sciences, Karachai-Cirkassian Republic, Nizhnij Arkhyz 369167, RussiaВ. Г. КлочковаSpecial Astrophysical Observatory of the Russian Academy of Sciences, Karachai-Cirkassian Republic, Nizhnij Arkhyz 369167, RussiaO. V. EzhkovaIssac Newton Institute of Chile, Uzbekistan Branch, UzbekistanR. O. GrayDept. of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USAP. García-LarioISO Data Centre, Astrophysics Division, Space Science Department of ESA, Villafranca del Castillo, Apartado de Correos 50727, 28080 Madrid, SpainJ. V. Perea–CalderónR. J. RudyThe Aerospace Corp. M2/266, PO Box 92957, Los Angeles, CA 90009, USAD. K. LynchThe Aerospace Corp. M2/266, PO Box 92957, Los Angeles, CA 90009, USAS. MazukThe Aerospace Corp. M2/266, PO Box 92957, Los Angeles, CA 90009, USAC. C. VenturiniThe Aerospace Corp. M2/266, PO Box 92957, Los Angeles, CA 90009, USAR. C. PuetterCenter for Astrophysics and Space Sciences, University of California, San Diego, C-0111, La Jolla, CA 92093, USA

Astronomy and Astrophysicsjournal2002en

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ABI

Annotatsiya

We present the results of optical and near-IR spectroscopic and broadband multicolour photometric observations of the emission-line star AS 381. Its properties were found to be similar to those of Be stars with warm dust, a group of galactic objects recently defined by Sheikina et al. ([CITE]). The spectrum of AS 381 indicates the presence of both a hot (early B-type) and a cool (K-type) star in the system. A high interstellar reddening ( mag) suggests that it is located at a distance of ≥3 kpc, and the companions have luminosity types ii or higher. The emission-line profiles indicate that the system is surrounded by a flattened circumstellar envelope, which is viewed close to pole-on. The hot companion is found to be ~2 mag brighter in the V-band and more massive (~) than the cool one (~7). The strong line emission and position of the companions in the Hertzsprung-Russell diagram indicate that the system is experiencing mass exchange. We suggest that AS 381 is the first B[e] supergiant binary discovered in the Milky Way.

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Mavzular

Astrophysics and Star Formation Studies Stellar, planetary, and galactic studies Astrophysical Phenomena and Observations

Identifikatorlar

DOI: 10.1051/0004-6361:20011711

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