The Chemical Abundances of Stars in the Halo (CASH) Project. II. New Extremely Metal-poor Stars

Details The Chemical Abundances of Stars in the Halo (CASH) Project. II. New Extremely Metal-poor Stars The Chemical Abundances of Stars in the Halo (CASH) Project. II. New Extremely Metal-poor Stars

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724212k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #242.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new abundance results from the Chemical Abundances of Stars in the Halo (CASH) project. The 500 CASH spectra were observed using the Hobby-Eberly Telescope in "snapshot" mode and are analyzed using an automated stellar parameter and abundance pipeline called CASHCODE. For the 20 most metal-poor stars of the CASH sample we have obtained high resolution spectra using the Magellan Telescope in order to test the uncertainties and systematic errors associated with the snapshot quality (i.e., R 15,000 and S/N 65) HET spectra and to calibrate the newly developed CASHCODE by making a detailed comparison between the stellar parameters and abundances determined from the high resolution and snapshot spectra. We find that the CASHCODE stellar parameters (effective temperature, surface gravity, metallicity, and microturbulence) agree well with the results of the manual analysis of the high resolution spectra. We present the abundances of three newly discovered stars with [Fe/H] < -3.5. For the entire pilot sample, we find typical halo abundance ratios with alpha-enhancement and Fe-peak depletion and a range of n-capture elements. The full CASH sample will be used to derive statistically robust abundance trends and frequencies (e.g. carbon and n-capture), as well as placing constraints on nucleosynthetic processes that occurred in the early universe.

Affiliated with

Also associated with

No associations

Rating

The Chemical Abundances of Stars in the Halo (CASH) Project. II. New Extremely Metal-poor Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Chemical Abundances of Stars in the Halo (CASH) Project. II. New Extremely Metal-poor Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Chemical Abundances of Stars in the Halo (CASH) Project. II. New Extremely Metal-poor Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1398784