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astro-ph2000★ 99 cited
Stellar Companions and the Age of HD 141569 and its Circumstellar Disk
A. J. Weinberger, R. M. Rich, E. E. Becklin +2
We investigate the stellar environment of the Beta Pictoris-like star HD 141569 with optical spectroscopy and near infrared imaging. The B9.5Ve primary, and an M2 and an M4 type st…
astro-ph2000★ 31 cited
Abundances of Stars in the Galactic Bulge Obtained Using the Keck Telescope
R. M. Rich, A. McWilliam
We report on detailed abundances of giants in the Galactic bulge, measured with the HIRES echelle spectrograph on the 10-m Keck telescope. We also review other work on the bulge fi…
astro-ph2000★ 63 cited
On the helium content of Galactic globular clusters via the R parameter
M. Zoccali, S. Cassisi, G. Bono +3
We estimate the empirical R parameter in 26 Galactic Globular Clusters covering a wide metallicity range, imaged by WFPC2 on board the HST. The improved spatial resolution permits…