Rotation and Stellar Evolution
نویسندگان
چکیده
منابع مشابه
Stellar Evolution with Rotation and Magnetic Fields
We examine the generation of a magnetic field in a solar-like star and its effects on the internal distribution of the angular velocity. We suggest that the evolution of a rotating star with magnetic fields leads to an equilibrium value of the differential rotation. This equilibrium is determined by the magnetic coupling, which favours a constant rotation profile, and meridional circulation whi...
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We derive the effective temperatures and gravities of 461 OB stars in 19 young clusters by fitting the H profile in their spectra. We use synthetic model profiles for rotating stars to develop a method to estimate the polar gravity for these stars, which we argue is a useful indicator of their evolutionary status. We combine these results with projected rotational velocity measurements obtained...
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Our ability to determine stellar ages from measurements of stellar rotation, hinges on how well we can measure the dependence of rotation on age for stars of different masses. Rotation periods for stars in open clusters are essential to determine the relations between stellar age, rotation, and mass (color). Until recently, ambiguities in v sin i data and lack of cluster membership information,...
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We discuss how the structure and oscillation frequencies of delta Scuti stars are aaected by fast rotation. We investigate the impact of these changes on our interpretation of observed frequencies used in an as-teroseismic analysis. We nd that, to rst order, frequency ratios between pairs of radial modes are not sensitive to rotation. However, for non-radial modes we nd that second-order terms ...
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We present a sample of 824 solar and late-type stars with X-ray luminosities and rotation periods. This is used to study the relationship between rotation and stellar activity and derive a new estimate of the convective turnover time. From an unbiased subset of this sample the power law slope of the unsaturated regime, LX/Lbol ∝ Ro , is fit as β = −2.70±0.13. This is inconsistent with the canon...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1981
ISSN: 0074-1809
DOI: 10.1017/s007418090007399x