Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-06
Astronomy and Astrophysics
Astrophysics
Poster for IAU Symposium No. 228, "From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution", V. Hill, P. Francois
Scientific paper
10.1017/S1743921305006095
We determine the carbon isotopic ratios in the atmospheres of some evolved stars in both globular clusters and the disk of our Galaxy. Analysis of 12CO and 13CO bands at 2.3 micron was carried out using fits to observed spectra of red giants and Sakurai's object (V4334 Sgr). The dependence of theoretical spectra on the various input parameters was studied in detail. The computation of model atmospheres and a detailed abundance analysis was performed in a self-consistent fashion. A special procedure for determining the best fits to observed spectra was used. We show, that globular cluster giants with [Fe/H] < -1.3 have a low 12C/13C = 4 +/- 1 abundance ration. In the spectra of Sakurai's object (V4334 Sgr) taken between 1997-98, the 2.3 micron spectral region is veiled by hot dust emission. By fitting UKIRT spectra we determined 12C/13C = 4 +/- 1 for the July, 1998 spectrum. CO bands in the spectra of ultracool dwarfs are modelled as well.
No associations
LandOfFree
12C/13C in atmospheres of red giants and peculiar stars 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 12C/13C in atmospheres of red giants and peculiar stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 12C/13C in atmospheres of red giants and peculiar stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-697450