Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-10
Astrophys.J.556:858-871,2001
Astronomy and Astrophysics
Astrophysics
Astrophysical Journal, in press (scheduled for the v556 n2 Aug 1, 2001 issue)
Scientific paper
10.1086/321624
Infrared OH lines at 1.55 - 1.56 um in the H-band were obtained with the Phoenix high-resolution spectrograph at the 2.1m telescope of the Kitt Peak National Observatory for a sample of 14 metal-poor stars. Detailed analyses of the sample stars have been carried out, deriving stellar parameters based on two methods: (a) spectroscopic parameters; (b) IRFM effective temperatures, trigonometric gravities and metallicities from Fe II lines. The Fe I lines present in the H-band region observed showed to be well fitted by the stellar parameters within $\Delta$[Fe/H] < 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] ~ +0.52 is obtained, whereas using the IRFM temperatures, Hipparcos gravities and [FeII/H], [O/Fe] ~ +0.25 is found. A mean of the two methods gives a final value of [O/Fe] ~ +0.4 for the metallicity range -2.2 < [Fe/H] < -1.2 of the sample metal-poor stars.
Barbuy Beatriz
Melendez Jorge
Spite Francois
No associations
LandOfFree
Oxygen Abundances in Metal-Poor Stars (-2.2 < [Fe/H] < -1.2) from Infrared OH lines 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 Oxygen Abundances in Metal-Poor Stars (-2.2 < [Fe/H] < -1.2) from Infrared OH lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxygen Abundances in Metal-Poor Stars (-2.2 < [Fe/H] < -1.2) from Infrared OH lines will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-398758