منابع مشابه
Stellar Ages from Stellar Rotation
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,...
متن کاملAsteroseismology and Stellar Rotation
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 ...
متن کاملRadio Observations of Algol . II . Computation of Close Stellar Encounters
We present here new astrometric measurements of Algol's position made with Very Long Baseline Interferometry. Using these measurements, along with a new estimate of the node of the inner binary and other orbital elements from the literature, we compute a new proper motion, with uncertainties six times less than those of Hipparcos. We compute the trajectories of Algol (using the new proper motio...
متن کاملStellar Rotation in Young Clusters. Ii. Evolution of Stellar Rotation and Surface Helium Abundance
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...
متن کاملRotation- and temperature-dependence of stellar latitudinal differential rotation
More than 600 high resolution spectra of stars of spectral type F and later have been obtained in order to search for signatures of differential rotation in line profiles. In 147 stars the rotation law could be measured; 28 of them are found to be differentially rotating. Comparison to rotation laws in stars of spectral type A reveals that differential rotation sets in at the convection boundar...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1931
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/91.6.663