YY Geminorum: A very late type close binary with possible magnetic stellar wind

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-ampl...

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Bibliographic Details
Main Authors: Qian S., Liu D., Tan W., Soonthornthum B.
Format: Article
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-0041522325&partnerID=40&md5=8bf40ee6cbcc66176037208412b6c4b6
http://cmuir.cmu.ac.th/handle/6653943832/5620
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Institution: Chiang Mai University
Language: English
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Summary: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.