Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...569l.107n&link_type=abstract
The Astrophysical Journal, Volume 569, Issue 2, pp. L107-L110.
Astronomy and Astrophysics
Astronomy
35
Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Population Ii
Scientific paper
We have obtained high-resolution spectra of the extremely metal-poor star CS 22949-037 ([Fe/H]=-3.79) in the region of the ultraviolet NH bands at 3360-3370 Å, which confirm our earlier report that it exhibits extreme nitrogen enhancement. We find [N/Fe]=2.3+/-0.4. The star is also known to have large relative overabundances, of order 0.5-1 dex, of carbon and the α-elements. This abundance pattern is not explained by any standard Galactic chemical enrichment model of which we are aware. The large N enhancement is, however, predicted by the zero heavy element, M>~200 Msolar, hypernova models of Woosley & Weaver and Fryer, Woosley, & Heger. If the rotating models of Fryer et al. are relevant to the enrichment of CS 22949-037, one might expect it to possess a large overabundance of oxygen, with a mass fraction similar to or larger than that of nitrogen, and an [O I] λ6300.3 line strength of ~2-8 mÅ.
Ando Hiroyasu
Aoki Wako
Beers Timothy C.
Norris John. E.
Ryan Sean G.
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