Extremely Metal-poor Stars. IX. CS 22949-037 and the Role of Hypernovae
نویسندگان
چکیده
منابع مشابه
Extremely Metal-poor Stars. Ix. Cs 22949-037 and the Role of Hypernovae
We have obtained high-resolution spectra of the extremely metal-poor star CS 22949-037 ( ) [Fe/H] p 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 . The star is also known to have large relative overabundances, [N/Fe] p 2.3 0.4 of order 0.5–1 dex, of carbon and the a-elements. This abundance ...
متن کاملSupernova Nucleosynthesis and Extremely Metal-Poor Stars
We investigate hydrodynamical and nucleosynthetic properties of the jet-induced explosion of a population III 40M⊙ star and compare the abundance patterns of the yields with those of the metal-poor stars. We conclude that (1) the ejection of Fe-peak products and the fallback of unprocessed materials can account for the abundance patterns of the extremely metal-poor (EMP) stars and that (2) the ...
متن کاملOxygen and Magnesium Abundance in the Ultra-Metal-Poor Giants CS 22949-037 and CS 29498-043: Challenges in Models of Atmospheres
We report the results of a non-LTE Fe, O and Mg abundance analysis of the carbon-nitrogen-rich ultrametal-poor giants CS 29498–043 and CS22949–037. The abundance of oxygen has been derived from measurements of the oxygen triplet at 7771–5 Å in high resolution spectra obtained with KeckI/HIRES and the forbidden line [O i] 6300 Å detected in the TNG/SARG spectra of CS 29498-043. Detailed non-LTE ...
متن کاملThe Frequency of Carbon Stars Among Extremely Metal Poor Stars
We demonstrate that there are systematic scale errors in the [Fe/H] values determined by the Hamburg/ESO Survey (and by inference by the HK Survey in the past) for certain extremely metal poor highly C-enhanced giants. The consequences of these scale errors are that a) the fraction of carbon stars at extremely low metallicities has been overestimated in several papers in the recent literature b...
متن کاملAbundance Patterns of Extremely Metal-Poor Stars
We perform hydrodynamical and nucleosynthesis calculations of core-collapse supernovae (SNe) and hypernovae (HNe) of Population (Pop) III stars. We provide new yields for the main-sequence mass of MMS = 13 − 50 M⊙ and the explosion energy of E = 1 − 40 × 10 51 ergs to apply for chemical evolution studies. Our HN yields based on the mixing-fallback model of explosions reproduce the observed abun...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2002
ISSN: 0004-637X,1538-4357
DOI: 10.1086/340665