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V379 Cep: a System of Two Binaries

Published online by Cambridge University Press:  09 August 2007

P. Mayer ,
P. Harmanec ,
H. Božić ,
P. Eenens ,
E.F. Guinan ,
G. McCook ,
P. Koubský ,
D. Ruždjak ,
D. Sudar  and
M. Šlechta
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P. Mayer
Affiliation:
Astronomical Institute of the Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic
P. Harmanec
Affiliation:
Astronomical Institute of the Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic Astronomical Institute of the Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic
H. Božić
Affiliation:
Hvar Observatory, Faculty of Geodesy, Zagreb University, 10000 Zagreb, Croatia
P. Eenens
Affiliation:
Departamento de Astronomia, Universidad de Guanajuato, 36000 Guanajuato, GTO, Mexico
E.F. Guinan
Affiliation:
Department of Astronomy and Astrophysics, Villanova University, Pennslyvania 19085, USA
G. McCook
Affiliation:
Department of Astronomy and Astrophysics, Villanova University, Pennslyvania 19085, USA
P. Koubský
Affiliation:
Astronomical Institute of the Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic
D. Ruždjak
Affiliation:
Hvar Observatory, Faculty of Geodesy, Zagreb University, 10000 Zagreb, Croatia
D. Sudar
Affiliation:
Hvar Observatory, Faculty of Geodesy, Zagreb University, 10000 Zagreb, Croatia
M. Šlechta
Affiliation:
Astronomical Institute of the Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic
M. Wolf
Affiliation:
Astronomical Institute of the Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic
S. Yang
Affiliation:
Physics & Astronomy Department, University of Victoria, PO Box 3055 STN CSC, Victoria, BC, V8W 3P6, Canada
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Abstract

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We obtained new series of electronic spectra and UBV photometry of V379 Cep and analyzed them in an effort to check whether the conclusion about its anomalous masses is not premature. We found that the second system of spectral lines seen in the spectra of V379 Cep does not belong to the secondary but to the primary of another binary Ba+Bb (orbital period of 159d0) which constitutes a quadruple system with the narrow-lined 99d76 eclipsing binary Aa+Ab (for which we report probable detection of the secondary and derive improved period and orbital elements). The mutual motion of the two binaries A+B around the common centre of gravity is also observable and the probable orbital period is some 7878 days. Our result shows that the components Aa and Ba are somewhat evolved but removes the reported discrepancy of anomalously small masses. We find that V379 Cep is an astrophysically interesting quadruple system for which a future combination of interferometry, spectroscopy and photometry can provide individual masses of all four bodies.

Keywords

binaries: eclipsingstars: early-typestars: individual (V379 Cep)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 499 - 502
Copyright
Copyright © International Astronomical Union 2007

References

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