The Rotation/Activity Relation for Solar Neighborhood ZAMS Stars

Details The Rotation/Activity Relation for Solar Neighborhood ZAMS Stars The Rotation/Activity Relation for Solar Neighborhood ZAMS Stars

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19712904a&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #129.04; Bulletin of the American Astronomical Society, Vol. 33, p.712

Astronomy and Astrophysics

Astronomy

Scientific paper

Low dispersion HST/GHRS observations were obtained of a rare, homogeneous sample of six solar neighborhood Pleiades Moving Group members in order to investigate the relationship of chromospheric and transition region (TR) emissions to rotation in very young stars. The six stars are all single (with 1 possible exception), have spectral classes of K0 V to K2 V, near-primordial lithium abundances, and space motions consistent with the Pleiades Moving Group. The only significant variable is rotation: rotation periods range from about 8 hours to 7 days. We have supplemented the sample with an archival HST/GHRS observation of AB Dor. Constraints from optical data suggest that several of the stars have radii that are 0.1-0.2 Rsun larger than the main sequence radius expected from the spectral type, and may still be slightly pre-main-sequence. Rotation/activity relations have been constructed for all lines with sufficient S/N: in general, but with some scatter, the TR lines show saturation for Speedy Mic and AB Dor and, as expected, a somewhat steeper slope for the slower rotators than do the chromospheric lines.

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