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astro-ph2003
Possible Post-AGB Stars
G. Wallerstein, G. Gonzalez, M. D. Shetrone
Radial velocities were measured for 5 potential post-AGB stars, two in the globular cluster NGC 1851 and three in the dSph galaxy Ursa Minor. All five potential PAGB stars were fou…
astro-ph1999
Age and Metallicity Effects in Omega Centauri
Joanne Hughes, George Wallerstein
We have observed (with vby filters) a field north of the core of the most massive globular cluster in our galaxy, Omega Centauri. We have found a correlation of age and metallicity…
astro-ph1998
New clues on non standard mixing on the RGB
C. Charbonnel, J. A. Brown, G. Wallerstein
We discuss the observational evidences for the non-standard mixing that occurs in low mass stars while they are ascending the Red Giant Branch.