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Title:
The distribution of rotational velocities for low-mass stars in the Pleiades
Authors:
Stauffer, John R.; Hartmann, Lee W.
Affiliation:
AA(NASA, Ames Research Center, Moffett Field, CA; Dominion Astrophysical Observatory, Victoria, Canada), AB(NASA, Ames Research Center, Moffett Field, CA; Dominion Astrophysical Observatory, Victoria, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 337-355. (ApJ Homepage)
Publication Date:
07/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
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
DOI:
10.1086/165371
Bibliographic Code:
1987ApJ...318..337S

Abstract

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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