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Unresolved Pre-Main Sequence Binaries in the HR Diagram

Published online by Cambridge University Press:  13 May 2016

Patrick Hartigan  and
Scott Kenyon
Patrick Hartigan
Affiliation:
Department of Physics and Astronomy, Rice University, 6100 S. Main, Houston TX 77005–1892
Scott Kenyon
Affiliation:
Center for Astrophysics, Mail Stop 16, 60 Garden St. Cambridge MA 02138

Abstract

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We consider how positions of unresolved pre-main-sequence binaries in the HR diagram compare with the positions of their corresponding primaries and secondaries. As one might expect from simple considerations, the composites appear younger than their components, and have masses intermediate between those of the two stars. However, the amount of the age difference between the composite and its components ranges from nearly zero to as much as an order of magnitude depending upon the specifics of the system such as the reddening and relative spectral types of the objects. We present four examples that illustrate these issues.

Type
XII. Invited Debate: The Status of PMS Tracks
Information
Symposium - International Astronomical Union , Volume 200: The Formation of Binary Stars , 2001 , pp. 496 - 500
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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