2004A&A...419.1095I


Query : 2004A&A...419.1095I

2004A&A...419.1095I - Astronomy and Astrophysics, volume 419, 1095-1109 (2004/6-1)

Oxygen and magnesium abundance in the ultra-metal-poor giants CS22949-037 and CS29498-043: Challenges in models of atmospheres.

ISRAELIAN G., SHCHUKINA N., REBOLO R., BASRI G., GONZALEZ HERNANDEZ J.I. and KAJINO T.

Abstract (from CDS):

We report the results of a non-LTE Fe, O and Mg abundance analysis of the carbon-nitrogen-rich ultra-metal-poor giants CS29498-043 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 [OI] 6300Å detected in the TNG/SARG spectra of CS29498-043. Detailed non-LTE analysis of Fe lines has provided reliable stellar parameters which, however, do not resolve the oxygen abundance conflict as derived from the OI 7771-5Å triplet and the [OI] 6300Å forbidden lines. We obtained the following oxygen abundance: for CS22949-037 [O/Fe] =3.13, 1.95; and for CS29498-043; [O/Fe]=3.02, 2.49, based on the OI 7771-5Å triplet and the [OI] 6300Å forbidden line, respectively. A similar conflict appears to exist between the forbidden resonance line MgI 4571Å and several subordinate lines, such as MgI 5172 and 5183Å. Our analysis demonstrates the failure of standard plane-parallel atmosphere models to describe the physical conditions in the line-forming regions of these ultra-metal-poor giants.

Abstract Copyright:

Journal keyword(s): Galaxy: evolution - nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: late-type - stars: population III - stellar atmospheres

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 234 0
2 HD 256106 * 06 23 14.6937705456 +23 49 39.926189244   10.48 9.05     K2 3 0
3 BPS CS 29498-0043 Pe* 21 03 52.1197651440 -29 42 50.344181712   14.8 13.72 13.013 12.406 CEMP-no 91 0
4 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.12 14.36   13.358 CEMP-no 175 0

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2022.09.26-02:56:37

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