Electronic Resource
Springer
Astrophysics and space science
99 (1984), S. 287-294
ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The chromosphreric-coronal emission of lower Main-Sequence single and binary stars can be correlated with an activity parameter of typeR=g(B-V)P −1, whereP is the rotation or orbital period andg(B-V) a function of the color resembling the convective turnover time. Observations indicate that the active region area coverage filling factor grows asR 2, and the whole stellar surface becomes filled with closed loop structures atR≃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 of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00650252
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