Kinematic Clues to the Origin and Evolution of Low Mass Contact Binaries
作者： Edward F. Guinan , David H. Bradstreet
DOI: 10.1007/978-94-009-3037-7_23
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摘要: We present new results concerning the rather old age (8 – 10 Gyr) of majority low mass contact binaries known as W UMa systems inferred from their space motions, velocity dispersions, and memberships in clusters such NGC 188. The great expected relatively short lifetimes imply that they have evolved into state detached or semi-detached progenitors with orbital periods a few days. Angular momentum loss may be provided by magnetic torques stellar wind, same mechanism brakes rotation single, cool dwarf stars during main sequence lifetimes. According to Webbink, ultimately coalesce single stars. speculate significant number presently coalescence period binaries.
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