Rotation and differential rotation in field F- and G-type stars
نویسندگان
چکیده
منابع مشابه
Differential Rotation in F Stars
Differential rotation can be detected in single line profiles of stars rotating more rapidly than about v sin i = 10 km s with the Fourier transform technique. This allows to search for differential rotation in large samples to look for correlations between differential rotation and other stellar parameters. I analyze the fraction of differentially rotating stars as a function of color, rotatio...
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We obtained high quality spectra of 135 stars of spectral types F and later and derived " overall " broadening functions in selected wavelength regions utilizing a Least Squares Deconvolution (LSD) procedure. Precision values of the projected rotational velocity v sin i were derived from the first zero of the Fourier transformed profiles and the shapes of the profiles were analyzed for effects ...
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We reanalyzed high quality spectra of 158 stars of spectral types A0–F1 and v sin i between 60 and 150 km s−1. Using a Least Squares Deconvolution technique we extracted high S/N broadening profiles and determined the loci of the Fourier transform zeros q1 and q2 where the S/N-ratio was high enough. The values of v sin i were redetermined and found to be consistent with the values derived by Ro...
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We discuss the internal structure of stars in the mass range 1.5 to 4M⊙ from the PMS to the subgiant phase with a particular emphasis on the convective core and the convective superficial layers. Different physical aspects are considered such as overshooting, treatment of convection, microscopic diffusion and rotation. Their influence on the internal structure and on the photospheric chemical a...
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Ca II H and K high resolution observations for 60 evolved stars in the field and in 5 open clusters are presented. From these spectra chromospheric fluxes are derived, and a homogeneous sample of more than 100 giants is built adding data from the literature. In addition, for most stars, rotational velocities were derived from CORAVEL observations. By comparing chromospheric emission in the clus...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021642