Ambruster, Carol

Contact Email: ca@ast.villanova.edu
Institute: Villanova University
First Coauthor: F. C. Fekel
Institute: Ctr. of Excellence, TN State Univ.
Second Coauthor: A. Brown
Institute: CASA, U. Colorado
Subject Area: Stellar Atmospheres, Circumstellar Material
Waveband: Multi-wavelength
Technique: Spectroscopy
Presentation: Poster Display
Title: Rotation/Activity Relations for Solar Neighborhood ZAMS Stars
Abstract: Low dispersion HST/GHRS observations were obtained of a rare, homogeneous sample of six solar neighborhood Pleiades Moving Group K dwarfs in order to investigate the relationship of chromospheric and transition region (TR) emissions to rotation in very young stars. The sample is supplemented by an archival HST/GHRS observation of AB Dor. The actual radii of the stars, based on high quality optical spectroscopic and photometric data, ranges from ZAMS to 0.2 Rsun larger than ZAMS, i.e., some of the stars appear to be slightly pre-main-sequence. Rotation/activity relations, incorporating observational uncertainties, will be presented for several lines formed at different temperatures.