4 Draconis - A unique triple system containing an M3 giant and a cataclysmic binary

Details 4 Draconis - A unique triple system containing an M3 giant and a cataclysmic binary 4 Draconis - A unique triple system containing an M3 giant and a cataclysmic binary

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..180r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 180-184.

Astronomy and Astrophysics

Astronomy

26

Binary Stars, Cataclysmic Variables, Giant Stars, Star Clusters, Companion Stars, M Stars, Radial Velocity, Stellar Motions, Ultraviolet Astronomy

Scientific paper

The M3 III giant 4 Dra has a UV bright companion discovered with IUE as a probable cataclysmic variable (CV). The authors determine the orbit of the M giant around the centre of gravity of the system that it forms with the cataclysmic binary and find P = 1703 d, e = 0.30, a1msin i = 82 Gm, and f(m) = 0.0076 M_sun;. They find that 4 Dra B shows spectrum variations like a CV and determine the photometric period as P = 3h58m.5±1m. 4 Dra B is the first CV for which an independent distance estimate (≅100 pc) can be given from the spectroscopic parallax of the companion. Properties of the CV, which is probably of the magnetic type (AM Her), are briefly discussed. The age of the CV may be less than 108yr.

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