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Titolo:
Oxygen abundances in metal-poor stars (-2.2 < [Fe/H] < -1.2) from infraredOH lines
Autore:
Melendez, J; Barbuy, B; Spite, F;
Indirizzi:
Univ Sao Paulo, Inst Astron & Geofis, Dept Astron, BR-01060970 Sao Paulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-01060970 BC01060970 Sao Paulo, Brazil Observ Paris, DASGAL, F-92195 Meudon, France Observ Paris Meudon France F-92195 Paris, DASGAL, F-92195 Meudon, France
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 556, anno: 2001,
parte:, 1
pagine: 858 - 871
SICI:
0004-637X(20010801)556:2<858:OAIMS(>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
EFFECTIVE TEMPERATURE SCALE; COSMIC-RAY NUCLEOSYNTHESIS; DEFICIENT RED GIANTS; HALO STARS; CHEMICAL EVOLUTION; EXTENDED SAMPLE; DISK STARS; DWARFS; PHOTOMETRY; PARAMETERS;
Keywords:
infrared : stars; stars : abundances; stars : late-type; stars : Population II;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
102
Recensione:
Indirizzi per estratti:
Indirizzo: Melendez, J Univ Sao Paulo, Inst Astron & Geofis, Dept Astron, Caixa Postal 3386, BR-01060970 Sao Paulo, Brazil Univ Sao Paulo Caixa Postal 3386 Sao Paulo Brazil BR-01060970 BC
Citazione:
J. Melendez et al., "Oxygen abundances in metal-poor stars (-2.2 < [Fe/H] < -1.2) from infraredOH lines", ASTROPHYS J, 556(2), 2001, pp. 858-871

Abstract

Infrared OH lines at 1.55-1.56 mum in the H band were obtained with the Phoenix high-resolution spectrograph at the 2.1 m telescope of the Kitt Peak National Observatory for a sample of 14 metal-poor stars. Detailed analysesof the sample stars have been carried out, deriving stellar parameters based on two methods: (a) spectroscopic parameters and (b) infrared flux method (IRFM) effective temperatures, trigonometric gravities, and metallicitiesfrom Fe II lines. The Fe I lines present in the H-band region observed were well fitted by the stellar parameters within A[Fe/H] less than or equal to 0.15 dex. The oxygen abundances were derived from fits of spectrum synthesis calculations to the infrared OH lines. CO lines in the H and K bands were obtained for a subsample in order to determine their carbon abundances. Adopting the spectroscopic parameters, a mean oxygen-to-iron ratio of [O/Fe] approximate to 0.52 is obtained, whereas using the IRFM temperatures, Hipparcos gravities, and [Fe II/H], [O/Fe] approximate to 0.25 is found. A mean of the two methods gives a final value of [O/Fe] approximate to 0.4 for the metallicity range -2.2 < [Fe/H] < -1.2 of the sample metal-poor stars.

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Documento generato il 27/11/20 alle ore 02:10:48