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The Dusty, Solar Type Spectroscopic Binary BD +20 307
AIP Conference Proceedings
The dustiest known main-sequence star, BD +20 307, is actually a double-lined binary with a period of 3.4202 days and a circular orbit. The system is also metal poor with [Fe/H] = −0.4. The components are late-F and early-G dwarfs and have a mass ratio of 1.07. The photometric period of about 3.5 days indicates that the components are synchronously rotating. The metal poor, binary nature invalidates the idea that the object is a very young single star with a warm planetmaking dust disk.doi:10.1063/1.3099246 fatcat:zleaalbnmrcptjtxz7qlfqrvxa