Rotational studies of lower main sequence stars in nearby open galactic clusters. I - Velocity distributions and age dependence

Details Rotational studies of lower main sequence stars in nearby open galactic clusters. I - Velocity distributions and age dependence Rotational studies of lower main sequence stars in nearby open galactic clusters. I - Velocity distributions and age dependence

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138...93b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 1, Sept. 1984, p. 93-100. Research supported by the Swiss National Sc

Astronomy and Astrophysics

Astrophysics

29

Angular Velocity, Main Sequence Stars, Open Clusters, Stellar Rotation, Dwarf Stars, K Stars, Late Stars, Pleiades Cluster, Time Dependence, Variable Stars, Velocity Distribution

Scientific paper

More than 300 new v sin i values are determined by means of the spectrometer CORAVEL in the following four nearby open galactic clusters: Pleiades, Hyades, Praesepe, and Coma Ber. After excluding all variable stars and known binaries the sample still contains about 200 stars. A determination of the velocity distribution in each cluster is presented which shows that for the Hyades the velocity distribution is consistent with a Dirac function. By comparing the mean rotational velocity of the different clusters it is shown that there is equal time dependence of rotation for stars of spectral type F8 V to K3 V and that the t to the -1/2 law for the rotational decay does not fit well the data. The v sin i determined for some photometric variable K dwarfs of the Pleiades seem to be in disagreement with a rotational modulation of luminosity.

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