Contact binary | Wikipedia audio article | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-11-18

This is an audio version of the Wikipedia Article:
Contact binary | Wikipedia audio article

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SUMMARY
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In astronomy, a contact binary is a binary star system whose component stars are so close that they touch each other or have merged to share their gaseous envelopes.  A binary system whose stars share an envelope may also be called an overcontact binary.  Almost all known contact binary systems are eclipsing binaries;  eclipsing contact binaries are known as W Ursae Majoris variables, after their type star, W Ursae Majoris.Contact binaries are sometimes confused with common envelopes. However, whereas the configuration of two touching stars in a contact binary has a typical lifetime of millions to billions of years, the common envelope is a dynamically unstable phase in binary evolution that either expels the stellar envelope or merges the binary in a timescale of months to years.