Carbon and Strontium Abundances of Metal-Poor Stars

Details Carbon and Strontium Abundances of Metal-Poor Stars Carbon and Strontium Abundances of Metal-Poor Stars

2007-06-20

arxiv.org/abs/0706.3043v1

Astronomy and Astrophysics

Astrophysics

ApJ, Accepted

Scientific paper

10.1086/520949

We present carbon and strontium abundances for 100 metal-poor stars measured from R$\sim $7000 spectra obtained with the Echellette Spectrograph and Imager at the Keck Observatory. Using spectral synthesis of the G-band region, we have derived carbon abundances for stars ranging from [Fe/H]$=-1.3$ to [Fe/H]$=-3.8$. The formal errors are $\sim 0.2$ dex in [C/Fe]. The strontium abundance in these stars was measured using spectral synthesis of the resonance line at 4215 {\AA}. Using these two abundance measurments along with the barium abundances from our previous study of these stars, we show it is possible to identify neutron-capture-rich stars with our spectra. We find, as in other studies, a large scatter in [C/Fe] below [Fe/H]$ = -2$. Of the stars with [Fe/H]$<-2$, 9$\pm$4% can be classified as carbon-rich metal-poor stars. The Sr and Ba abundances show that three of the carbon-rich stars are neutron-capture-rich, while two have normal Ba and Sr. This fraction of carbon enhanced stars is consistent with other studies that include this metallicity range.

Affiliated with

Also associated with

No associations

Rating

Carbon and Strontium Abundances of 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 Carbon and Strontium Abundances of Metal-Poor Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carbon and Strontium Abundances of Metal-Poor Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-34778