Cool carbon stars in the halo: new very red or distant objects
Abstract
The goal of this paper is to present and analyse a new sample of cool carbon (C)stars located in the halo. Twenty three new C stars were discovered. Spectra are typical of N-type stars with C2 and CN bands and sometimes Halpha in emission. ... Four objects are particularly red with J-K > 3, with 2 located at more than 5 kpc. from the Galactic plane. Eight additional objects with similar properties are found in the literature and our previous works. These 12 C stars could be useful to study mass loss at low metallicity. Two objects are at distances of 95 and 110 kpc. They are located in the region with galactocentric Z < -60 kpc in which the model of Law et al. predicts the Sgr stream to have a loop. (Abstact abridged)
Cite
@article{arxiv.0709.3000,
title = {Cool carbon stars in the halo: new very red or distant objects},
author = {N. Mauron and K. S. Gigoyan and T. R. Kendall},
journal= {arXiv preprint arXiv:0709.3000},
year = {2009}
}
Comments
16 pages, 12 figures, accepted by AA