Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21547812l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #478.12; Bulletin of the American Astronomical Society, Vol. 42, p.567
Other
Scientific paper
We present the high-resolution spectral analysis of a sample of stars in the globular cluster M5. The sample covers the red giant branch (seven stars, Mv from 0.6 to -1.9), the red horizontal branch (three stars), and the asymptotic giant branch (seven stars, Mv from -0.2 to -2.0). We obtained the spectra with the HIRES spectrograph on Keck I, with a wavelength range from 3700 to 7950 angstroms for the HB and AGB sample, and 5300 to 7600 angstroms for the RGB sample. Given the expanded wavelength coverage over earlier studies, we are able to look for any variations in the neutron-capture ratios in the cluster. M5 is also particularly well-suited for studying evolutionary effects on abundances beyond the RGB because the RGB and AGB are cleanly separated in c-m diagrams. By performing detailed abundance analysis of our HB/AGB stars and comparing these results to our sample of our RGB stars as well results from the literature, we explore if and how surface abundance ratios have been modified during the stellar evolution process. In particular we are examining if the surface abundances can reveal any mixing processes that a star may encounter as it evolves onto and up the AGB. These processes along the AGB are not observationally well studied, and M5 can provide crucial information for the models. One preliminary result is that the 12C/13C ratio remains at a approximately constant value of ˜4 over our entire sample of AGB stars. This is very close to the CN equilibrium value and also close to the 12C/13C found in other cluster red giants and field metal-poor stars.
Bolte Michael
Johnson Jennifer A.
Lai David K.
Lucatello Sara
Smith Graeme H.
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