The RS CVn binary XY UMa as a member of a triple system

Details The RS CVn binary XY UMa as a member of a triple system The RS CVn binary XY UMa as a member of a triple system

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...340..415c&link_type=abstract

Astronomy and Astrophysics, v.340, p.415-418 (1998)

Astronomy and Astrophysics

Astrophysics

19

Binaries: Eclipsing, Stars: Individual: Xy Uma, Stars: Pre-Main Sequence, Stars: Magnetic Fields

Scientific paper

New minima of the short period RS CVn binary system XY UMa taken in 1997-98 follow the light-time orbit with a 30.5 years period. An inferior conjunction of the third body with mass 0.23 +/- 0.03 Msun occurred in 1979. It is suggested that the light-curves of XY UMa taken in 1978-79 were affected by the eclipse of the binary system by a dusty envelope of the protostellar object responsible also for the observed infrared excess. There is no correlation between the long-term brightness variations of the system and the minima times in the O-C diagram, so its explanation by the Applegate mechanism proposed recently by Erdem & Gueduer (\cite{ergu98}) is brought into question.

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