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A Bright Spot and a Serendipitous Stellar Flare on the Contact-Binary VW Cep

Published online by Cambridge University Press:  12 April 2016

K.E. Egge  and
B.R. Pettersen
K.E. Egge
Affiliation:
Institute of Mathematical and Physical Sciences, University of Tromsø, N-9001 Tromsø, Norway
B.R. Pettersen
Affiliation:
Institute of Mathematical and Physical Sciences, University of Tromsø, N-9001 Tromsø, Norway

Extract

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Almost twenty years ago a large flare event was observed on the prototype contact binary W UMa by Kuhi (1964). Similar events have been reported on 44 i Boo (Eggen 1948) and U Peg (Huruhata 1952) . In this paper we present photoelectric observations at three wavelengths of a flare on VW Cep. This is the first event of this kind to be reported for this star. VW Cep is a triple system. The main contributor to the visual flux is the eclipsing binary, consisting of a Kl primary and a G6 secondary (Kopal 1978), classified to be in contact. The orbital period is 6h 41m. Seven per cent of the total flux in the visual filter is due to the third component, a late K type dwarf at a distance of 12 AU from the eclipsing system (Hershey 1975).

Type
Session III: Observed Activity in Related Objects
Information
International Astronomical Union Colloquium , Volume 71: Activity in Red-Dwarf Stars , 1983 , pp. 481 - 483
Copyright
Copyright © Reidel 1983

References

Eggen, O.J., 1948, Ap.J. 108, 15.CrossRefGoogle Scholar
Hershey, J.L., 1975, AJ 80, 662.CrossRefGoogle Scholar
Huruhata, M., 1952, Publ.Astron.Soc.Pacific 64, 200.Google Scholar
Johnson, H.L., 1966, Ann.Rev.Astron.Astrophys. 4, 193.CrossRefGoogle Scholar
Kopal, Z., 1978, “Dynamics of Close Binary Systems”, D. Reidel Publ. Co., Holland, p. 433.Google Scholar
Kuhi, L.V., 1964, Pubi.Astron.Soc.Pacific 76, 430.Google Scholar