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Astron. Astrophys. 353, 1009-1015 (2000)


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Circumstellar structures in the eclipsing binary [FORMULA] Lyr A

Gasdynamical modelling confronted with observations

D.V. Bisikalo 1, P. Harmanec 2, A.A. Boyarchuk 1, O.A. Kuznetsov 3 and P. Hadrava 2

1 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, Moscow 109017, Russia (bisikalo@inasan.rssi.ru; aboyar@inasan.rssi.ru)
2 Astronomical Institute, Academy of Sciences of the Czech Republic, 251 65 Ond ejov, Bohemia, Czech Republic (hec@sunstel.asu.cas.cz; had@sunstel.asu.cas.cz)
3 Keldysh's Institute of Applied Mathematics, Miusskaya Square 4, Moscow 125047, Russia (kuznecov@spp.keldysh.ru)

Received 8 June 1999 / Accepted 9 November 1999

Abstract

A disentangling technique was applied to obtain an independent check on the amplitude of the radial-velocity curve of the more massive component of [FORMULA] Lyr derived earlier. This is crucial for the reliable determination of the component masses and their separation. Currently the best available basic physical properties of the binary were then defined. For them, 3-D gasdynamical simulations of mass transfer between the binary components of [FORMULA] Lyr were calculated and confronted with the existing evidence of various circumstellar structures within the binary system. It turns out that the gasdynamical model is able to explain, in principle, the formation of the basic observed components of the circumstellar matter. This brings us one step farther to the understanding of this unusual object.

Key words: stars: emission-line, Be – stars: binaries: eclipsing – stars: binaries: spectroscopic – stars: binaries: visual – stars: individual: – techniques: spectroscopic

Send offprint requests to: D.V. Bisikalo

© European Southern Observatory (ESO) 2000

Online publication: January 18, 2000

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