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    Chemical Abundances For Evolved Stars In M5: Lithium Through Thorium

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    Date
    2011-02
    Author
    Lai, David K.
    Smith, Graeme H.
    Bolte, Michael
    Johnson, Jennifer A.
    Lucatello, Sara
    Kraft, Robert P.
    Sneden, Christopher
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    Abstract
    We present analysis of high-resolution spectra of a sample of stars in the globular cluster M5 (NGC 5904). The sample includes stars from the red giant branch (RGB; seven stars), the red horizontal branch (two stars), and the asymptotic giant branch (AGB; eight stars), with effective temperatures ranging from 4000 K to 6100 K. Spectra were obtained with the HIRES spectrometer on the Keck I telescope, with a wavelength coverage from 3700 angstrom to 7950 angstrom for the HB and AGB sample, and 5300 angstrom to 7600 angstrom for the majority of the RGB sample. We find offsets of some abundance ratios between the AGB and the RGB branches. However, these discrepancies appear to be due to analysis effects, and indicate that caution must be exerted when directly comparing abundance ratios between different evolutionary branches. We find the expected signatures of pollution from material enriched in the products of the hot hydrogen burning cycles such as the CNO, Ne-Na, and Mg-Al cycles, but no significant differences within these signatures among the three stellar evolutionary branches especially when considering the analysis offsets. We are also able to measure an assortment of neutron-capture element abundances, from Sr to Th, in the cluster. We find that the neutron-capture signature for all stars is the same, and shows a predominately r-process origin. However, we also see evidence of a small but consistent extra s-process signature that is not tied to the light-element variations, pointing to a pre-enrichment of this material in the protocluster gas.
    Department
    Astronomy
    Subject
    globular clusters: individual (ngc 5904)
    stars: abundances
    stars: agb
    and post-agb
    metal-poor stars
    asymptotic giant branch
    globular-cluster m5
    experimental oscillator-strengths
    rr lyrae variables
    red giant
    low-mass
    neutron-capture
    bright giants
    milky-way
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34520
    Citation
    Lai, David K., Graeme H. Smith, Michael Bolte, Jennifer A. Johnson, Sara Lucatello, Robert P. Kraft, and Christopher Sneden. >Chemical abundances for evolved stars in M5: lithium through thorium.> The Astronomical Journal 141, No. 2 (Feb., 2011): 62.
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