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A unique symbiotic-like/cataclysmic triple star 4 Dra (=CQ Dra): six years of UBV monitoring

Published online by Cambridge University Press:  12 April 2016

Z. Urban ,
L. Hric  and
L. Leedjärv
Z. Urban
Affiliation:
Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranská Lomnica, Slovakia, e-mail:urban@ta3.sk, hric@ta3.sk
L. Hric
Affiliation:
Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranská Lomnica, Slovakia, e-mail:urban@ta3.sk, hric@ta3.sk
L. Leedjärv
Affiliation:
Tartu Astrophysical Observatory, 2444 Töravere, Estonia, e-mail:leed@jupiter.aai.ee

Extract

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The bright (mv ≈ 5) M3III star 4 Dra (HD108907, HR4765, CQ Dra) is a unique triple system combining in itself the basic structural properties of a symbiotic-like binary and of a cataclysmic one. The red giant 4 Dra A forms a wide binary (Porb ≈ 1703 d) with a hot companion 4 Dra B which seems to be a compact cataclysmic binary system (4 Dra BC, probable Porb of about 4 h).

We have monitored the 4 Dra system in UBV at the Skalnaté Pleso and Starà Lesna Observatories and at the Tartu Astrophysical Observatory during a total of 205 nights between 1989 March 12 and 1995 June 20; a few additional data points were obtained at the Bucharest Observatory.

Type
Novae & Symbiotic Stars
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 345 - 346
Copyright
Copyright © Kluwer 1996