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Stellar Rotation in Young Clusters. II. Evolution of Stellar Rotation and Surface Helium Abundance
W. Huang, D. R. Gies
We derive the effective temperatures and gravities of 461 OB stars in 19 young clusters by fitting the H-gamma profile in their spectra. We use synthetic model profiles for rotatin…
Stellar Rotation in Young Clusters. I. Evolution of Projected Rotational Velocity Distributions
Wenjin Huang, Douglas R. Gies
Open clusters offer us the means to study stellar properties in samples with well-defined ages and initial chemical composition. Here we present a survey of projected rotational ve…
The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters
M. Virginia McSwain, Douglas R. Gies
Be stars are a class of rapidly rotating B stars with circumstellar disks that cause Balmer and other line emission. There are three possible reasons for the rapid rotation of Be s…
Ice Age Epochs and the Sun's Path Through the Galaxy
D. R. Gies, J. W. Helsel
We present a calculation of the Sun's motion through the Milky Way Galaxy over the last 500 million years. The integration is based upon estimates of the Sun's current position and…
First Results from the CHARA Array. I. An Interferometric and Spectroscopic Study of the Fast Rotator alpha Leonis (Regulus)
H. A. McAlister, T. A. ten Brummelaar, D. R. Gies +13
We report on K-band interferometric observations of the bright, rapidly rotating star Regulus (type B7 V) made with the CHARA Array on Mount Wilson, California. Through a combinati…