On the role of duplicity in the Be phenomenon

Free access article

Issue		A&A Volume 396, Number 3, December IV 2002


Page(s)		937 - 948
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20021534

A&A 396, 937-948 (2002)
DOI: 10.1051/0004-6361:20021534

I. General considerations and the first attempt at a 3-D gas-dynamical modelling of gas outflow from hot and rapidly rotating OB stars in binaries

P. Harmanec^{1, 2}, D. V. Bisikalo³, A. A. Boyarchuk³ and O. A. Kuznetsov⁴

¹ Astronomical Institute of the Charles University, V Holesovickách 2, 180 00 Praha 8 - Troja, Bohemia, Czech Republic
² Astronomical Institute of the Academy of Sciences of the Czech Republic, 251 65 Ondrejov, Bohemia, Czech Republic
³ Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, Moscow 109017, Russia
e-mail: bisikalo@inasan.rssi.ru; aboyar@inasan.rssi.ru
⁴ Keldysh's Institute of Applied Mathematics, Miusskaya Square 4, Moscow 125047, Russia
e-mail: kuznecov@spp.keldysh.ru

(Received 24 July 2002 / Accepted 14 October 2002)

Abstract
This paper begins a new series of studies devoted to a critical re-examination of the role of duplicity for the Be phenomenon and for the variability patterns observed for many Be stars. Based on both dynamical and energy considerations and a numerical gas-dynamical modelling, a new hypothesis of the formation of Be envelopes in binaries, via an outflow from a rapidly rotating B star in a detached binary, is outlined. It is shown that such an outflow is facilitated by the presence of a companion to the B star and leads to the formation of an envelope but not to any significant mass exchange between the binary components.

Key words: stars: emission-line, Be -- stars: binaries: close -- stars: binaries: spectroscopic -- stars: fundamental parameters

Offprint request: P. Harmanec, hec@sunstel.asu.cas.cz

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