The carbon-to-oxygen ratio in halo dwarfs

Details The carbon-to-oxygen ratio in halo dwarfs The carbon-to-oxygen ratio in halo dwarfs

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1568t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 4, p. 1568-1584.

Astronomy and Astrophysics

Astronomy

159

Carbon, Dwarf Stars, Line Spectra, Oxygen, Stellar Composition, Stellar Spectrophotometry, Abundance, Halos, Local Thermodynamic Equilibrium, Metallicity, Stellar Atmospheres

Scientific paper

C I and O I lines have been observed in 34 metal-poor dwarfs and subgiants, and both LTE and non-LTE analyses of these lines have been performed. Analysis of the lines is vitiated by a systematic temperature-dependent error, showing that present methods of analysis may not give the correct elemental abundances. The (C/O) ratios are, however, almost independent of effective temperature and are therefore reliable. These ratios are found to be essentially constant over the metallicity range (Fe/H) = -2.7 - -1.0 in the survey. The mean value is (C/O) = -0.57 +/- 0.12. Analysis of CH lines gives (C/Fe) = -0.14 +/- 0.20. It is considered that the O abundance in halo stars is more reliably indicated by the forbidden O I line, and it is suggested that (O/Fe) = +0.45 +/- 0.1 is representative for (Fe/H) less than -1. It is suggested that (C/Fe) = -0.1 and (O/Fe) about +0.5 are representative of the halo.

Affiliated with

Also associated with

No associations

Rating

The carbon-to-oxygen ratio in halo dwarfs 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 The carbon-to-oxygen ratio in halo dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The carbon-to-oxygen ratio in halo dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1869419