Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542511w&link_type=abstract
American Astronomical Society, AAS Meeting #215, #425.11; Bulletin of the American Astronomical Society, Vol. 42, p.337
Other
Scientific paper
It has been known for some time that metallic line, A/F stars exhibit metal abundance characteristics that are quite different from what is seen in normal stars. In particular, iron is usually over abundant for a given spectral type, while calcium is usually under abundant. The later is particularly true for the resonant CaII lines. This effect is large enough that metallic line candidates can be found, even at low resolution, by comparing the abundance from the CaII K line to that of metallic lines in other regions of the spectrum. We will present a sample of candidate metallic line stars from blue stragglers in the thick disk of the Galaxy. Characteristics of the sample will be explored, including, the spatial distribution of metallic line candidates, effects on Ca, Mg, and Fe lines, the cutoff temperature for the metallic line effect and the relative number of metallic line stars to normal blue stragglers. We will also discuss the ramifications for the physical models which describe the metallic line effect and, in particular, the question of whether photospheric diffusion or gas and grain accretion from the ISM is more suited to explain this effect in the blue straggler population.
Powell William L.
Wilhelm Ronald J.
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