YY Geminorum: A Very Late Type Close Binary with Possible Magnetic Stellar Wind

Details YY Geminorum: A Very Late Type Close Binary with Possible Magnetic Stellar Wind YY Geminorum: A Very Late Type Close Binary with Possible Magnetic Stellar Wind

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124.1060q&link_type=abstract

The Astronomical Journal, Volume 124, Issue 2, pp. 1060-1063.

Astronomy and Astrophysics

Astronomy

6

Stars: Binaries: Close, Stars: Individual: Constellation Name: Yy Geminorum, Stars: Mass Loss

Scientific paper

The O-C curve of the very late type close binary (dM1e+dM1e) YY Geminorum is formed and analyzed based on all available times of minimum light. It is found that the orbital period shows a secular decrease with rate dP/dt=-1.08×10-8 days yr-1. There is weak evidence indicating that a small-amplitude period oscillation is superposed on the period decrease. YY Gem is a well-detached eclipsing binary containing two very active components. The secular period decrease may suggest that the system is undergoing secular mass and angular momentum loss via a magnetic stellar wind. If the small-amplitude oscillation is real, it can be explained either by magnetic activity cycles or by the presence of a giant planet or brown dwarf.

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