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Magnetic Braking in Cataclysmic and Low-Mass X-Ray Binaries*

Published online by Cambridge University Press:  12 April 2016

O. Vilhu
O. Vilhu*
Affiliation:
Nordita, Copenhagen, Denmark

Abstract

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The chromospheric-coronal emission of lower Main-Sequence single and binary stars can be correlated with an activity parameter of type R = g(B-V)P-1 where P is the rotation or orbital period and g(B-V) a function of the color resembling the convective turnover time. Observations indicate that the active region area coverage filling factor grows as R2, and the whole stellar surface becomes filled with closed loop structures at R ≂ 3. A braking formula is proposed (Equation 4) to include all periods (0.d1 ≲ R ≳ 30d) and spectral types F-M. On the basis of this equation, the mass transfer rates in compact binaries (driven by the gradual loss of orbital angular momentum) are discussed. It is concluded that the magnetic braking has good chances of being that mechanism which drives the mass transfer in cataclysmic variables and galactic bulge X-ray sources.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 80: Double Stars, Physical Properties and Generic Relations , 1984 , pp. 287 - 294
Copyright
Copyright © Reidel 1984

Footnotes

**

On leave from Observatory and Astrophysics Laboratory, University of Helsinki.

*

Paper presented at the Lembang-Bamberg IAU Colloquium No. 80 on ‘Double Stars: Physical Properties and Generic Relations, held at Indonesia, 3-7 June, 1983.

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