Abstract
view Abstract Citations (179) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Studies of Steller Rotation. I. Comparison of Rotational Velocities in the Hyades and Coma Clusters. Kraft, Robert P. Abstract The quantity (V sin i), which gives the mean projected rotational velocity as a function of absolute magnitude, is derived for the Hyades and Coma clusters, based on single stars and members of binary systems with periods over 10 days The color-magnitude diagrams for both clusters are considered de novo, and are based only on single stars, the primary components of single-lined spectroscopic binaries, and resolved visual binaries Rotational velocities are obtained with high spectral resolution for virtually all stars down to spectral type GO V. The following conclusions are reached: (1) The frequency of binaries and of Am stars is approximately the same in the two clusters. (2) The function (V sin i) is the same for both clusters when the two Ap stars of Coma are omitted. (3) Allowing for evolutionary and abundance effects, one finds that the rotational velocities of Hyades (and Coma) stars do not differ significantly on the average from those of the field stars. Further work at high resolution for field F-type stars is needed, however. In connection with these results, the following questions are also discussed: (1) Is there a preferential direction of rotational axes for stars in clusters? (2) What is the shape of the frequency distribution about the mean for rotational velocities of stars in the Hyades and Coma? (3) How is the rotational angular momentum per unit mass distributed as a function of mass, and is it the same in the two clusters? It is possible to give fairly definite answers to these questions, except for the last part of No. 3, which requires a definitive determination of the mass-luminosity relation for Coma. Publication: The Astrophysical Journal Pub Date: August 1965 DOI: 10.1086/148330 Bibcode: 1965ApJ...142..681K full text sources ADS | data products SIMBAD (118) Related Materials (6) Erratum: 1965ApJ...142.1699. Part 2: 1965ApJ...142.1699K Part 3: 1965ApJ...142..703K Part 4: 1966ApJ...143..299A Part 5: 1967ApJ...148..129K Part 6: 1967ApJ...150..551K
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
