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The Dusty, Solar Type Spectroscopic Binary BD +20 307

Fekel, Francis C. and Zuckerman, B. and Williamson, Michael H. and Henry, Gregory W. and Muno, M. P. (2009) The Dusty, Solar Type Spectroscopic Binary BD +20 307. In: Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings. No.1094. American Institute of Physics , Melville, NY, pp. 836-839. ISBN 978-0-7354-0627-8.

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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 planet‐making dust disk. Instead, the metal poor nature of the system and the lithium abundances of the components argue that the system is likely several billion years old, and so the dust disk results from the recent collision of two planetary mass rocky objects. Thus, BD +20 307 may well be the first known system with planets orbiting a close binary star.

Item Type:Book Section
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Henry, Gregory W.0000-0003-4155-8513
Additional Information:© 2009 American Institute of Physics. Published online 16 February 2009. This research was supported in part by NASA through a Chandra Observatory award to UCLA. Automated astronomy at Tennessee State University is supported by NASA, NSF, Tennessee State University, and the State of Tennessee through its Centers of Excellence program.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Tennessee State UniversityUNSPECIFIED
State of TennesseeUNSPECIFIED
Subject Keywords:planetary systems: formation - stars: individual(BD +20 307) - binaries: spectroscopic - stars: rotation
Series Name:AIP Conference Proceedings
Issue or Number:1094
Classification Code:PACS: 97.80.Fk,97.82.Jw,97.10.Qh
Record Number:CaltechAUTHORS:20160505-105815810
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66687
Deposited On:05 May 2016 22:07
Last Modified:11 Nov 2021 00:01

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