HD 9770, a southern active-chromosphere system

Details HD 9770, a southern active-chromosphere system HD 9770, a southern active-chromosphere system

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.325..143w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 325, Issue 1, pp. 143-150.

Astronomy and Astrophysics

Astronomy

5

Line: Formation, Line Profiles, Stars: Activity, Binaries: Eclipsing, Stars: Chromospheres, Stars: Individual: Hd9770

Scientific paper

The visual triple system HD9770 (BB Scl) has been the subject of a four-year programme of UVB(RI)C photometry and Hα échelle spectroscopy. Analysis of the data obtained over that period shows that star B, and probably also star A, of HD9770 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 0.476525+/-0.000013d 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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