HD 9770, a southern active-chromosphere system |
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| Authors: | L.C. Watson J.D. Pritchard J.B. Hearnshaw P.M. Kilmartin A.C. Gilmore |
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| Affiliation: | Mount John University Observatory and Department of Physics &Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand |
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| 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. |
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| Keywords: | line: formation line: profiles stars: activity binaries: eclipsing stars: chromospheres stars: individual: HD 9770 |
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