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HD 9770, a southern active-chromosphere system
Authors:L.C. Watson  J.D. Pritchard  J.B. Hearnshaw  P.M. Kilmartin  A.C. Gilmore
Affiliation:Mount John University Observatory and Department of Physics &Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
Abstract:The visual triple system HD 9770 (BB Scl) has been the subject of a four-year programme of UVB ( RI )C photometry and H α échelle spectroscopy. Analysis of the data obtained over that period shows that star B, and probably also star A, of HD 9770 is a binary. The A system comprises a K1V star, which may be in a binary system with another K dwarf. The B system is an eclipsing binary of the BY Dra type in which both stars are chromospherically active. An orbital period of 0.476 525±0.000 013 d has been derived from the light curve in V . Physical parameters derived from analysis of the light curves in UBV ( RI )C are presented.
Keywords:line: formation    line: profiles    stars: activity    binaries: eclipsing    stars: chromospheres    stars: individual: HD 9770
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