Carbon abundances of metal-poor stars in the galactic halo

Details Carbon abundances of metal-poor stars in the galactic halo Carbon abundances of metal-poor stars in the galactic halo

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13q.580b&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Stellar Abundances

Scientific paper

Very metal-deficient stars that exhibit enhancements of their carbon abundances are of crucial importance for understanding a number of issues: The nature of stellar evolution among the first generations of stars the shape of the Initial Mass Function and the relationship between carbon enhancement and neutron-capture processes in particular the astrophysical s-process. One fundamental result from recent objective-prism surveys dedicated to the discovery of metal-deficient stars is that the frequency and perhaps the level of carbon enhancement increases greatly with declining metallicity.
Most previous discoveries of these important stars have been serendipitous as the stars were initially targeted because of their apparently low overall metallicity and it was only discovered later that carbon was strongly enhanced. To more completely explore this phenemonon we have undertaken spectroscopic follow-up of a published list of metal-deficient candidates from the Hamburg/ESO prism survey that show clearly strong carbon features directly on the survey plates. We have already obtained spectra for some 350 of the 413 stars in the sample and will report on their observed properties including estimates of their [Fe/H] and [C/Fe] their radial velocities and their spatial distribution.

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