EDP Sciences
Free access
Issue
A&A
Volume 388, Number 1, June II 2002
Page(s) 268 - 278
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020486


A&A 388, 268-278 (2002)
DOI: 10.1051/0004-6361:20020486

Spectroscopy of four early-type eclipsing binaries

P. Mayer1, R. Lorenz2 and H. Drechsel2

1  Astronomical Institute of the Charles University, V Holesovickách 2, 180 00 Praha 8, Czech Republic
2  Dr. Remeis-Sternwarte Bamberg, Astronomisches Institut der Universität Erlangen-Nürnberg, Sternwartstraße 7, 96049 Bamberg, Germany
    e-mail: lorenz/drechsel@sternwarte.uni-erlangen.de

(Received 25 February 2002 / Accepted 25 March 2002)

Abstract
New spectroscopic data were obtained for the early-type binaries V337 Aql , V649 Cas , V382 Cyg , and V431 Pup . Their radial velocity curves are presented. These are the first such data for V337 Aql and V431 Pup . In the case of V382 Cyg , our data confirm previously obtained results. Especially for V649 Cas our radial velocity curve yields important new implications for the component masses: the detection of third body lines, which are blended with the lines of the primary component, solves the problem of the unacceptably small masses formerly deduced for this binary; now we determine masses closer to the values expected for spectral type B 0. V431 Pup is an important object, because it is a new member of the small group of early-type eclipsing binaries with an evolved component. A published light curve of V337 Aql is solved by the MORO code, and system parameters are derived. The period of V649 Cas is found to be variable, and a more accurate period is calculated for V431 Pup .


Key words: binaries: eclipsing -- binaries: spectroscopic -- stars: early-type -- stars: fundamental parameters -- stars: individual: V337 Aql, V649 Cas, V382 Cyg, V431 Pup

Offprint request: P. Mayer, mayer@mbox.cesnet.cz

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