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The luminous B[e] binary AS 381

А. С. МирошниченкоCentral Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, Saint-Petersburg 196140, RussiaK. S. BjorkmanRitter Observatory, Dept. of Physics & Astronomy, University of Toledo, Toledo, OH 43606-3390, USAЕ. Л. ЧенцовIsaac Newton Institute of Chile, SAO Branch, RussiaВ. Г. КлочковаIsaac Newton Institute of Chile, SAO Branch, 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

ABI

Аннотация

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.

Мавзулар

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

Идентификаторлар

DOI: 10.1051/0004-6361:20011711

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