The distribution of rotational velocities for low-mass stars in the Pleiades

Details The distribution of rotational velocities for low-mass stars in the Pleiades The distribution of rotational velocities for low-mass stars in the Pleiades

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..337s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 337-355.

Astronomy and Astrophysics

Astrophysics

200

Angular Velocity, Dwarf Stars, Late Stars, Pleiades Cluster, Star Clusters, Stellar Mass, Stellar Rotation, Angular Momentum, H Alpha Line, Interstellar Extinction, K Stars, Pre-Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

The available spectral type and color data for late-type Pleiades members have been reanalyzed, and new reddening estimates are obtained. New photometry for a small number of stars and a compilation of H-alpha equivalent widths for Pleiades dwarfs are presented. These data are used to examine the location of the rapid rotators in color-magnitude diagrams and the correlation between chromospheric activity and rotation. It is shown that the wide range of angular momenta exhibited by Pleiades K and M dwarfs is not necessarily produced by a combination of main-sequence spin-downs and a large age spread; it can also result from a plausible spread in initial angular momenta, coupled with initial main-sequence spin-down rates that are only weakly dependent on rotation. The new reddening estimates confirm Breger's (1985) finding of large extinctions confined to a small region in the southern portion of the Merope nebula.

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