A CH star in the globular cluster NGC 6426
Astrophysics of Galaxies
2015-06-05 v2 Solar and Stellar Astrophysics
Abstract
We report on the serendipitous discovery of a carbon star near the centre of the low-metallicity globular cluster NGC 6426. We determined its membership and chemical properties using medium-resolution spectra. The radial velocity of -159 km/s makes it a member of the cluster. We used photometric data from the literature and the COMARCS stellar atmospheric models to derive its luminosity, effective temperature, surface gravity, metallicity, and approximate C, N, and O abundance ratios. According to these properties, we suggest that this star is a genuine carbon rich low-metallicity AGB star.
Cite
@article{arxiv.1207.4357,
title = {A CH star in the globular cluster NGC 6426},
author = {M. Sharina and B. Aringer and E. Davoust and A. Y. Kniazev and C. J. Donzelli},
journal= {arXiv preprint arXiv:1207.4357},
year = {2015}
}
Comments
5 pages, accepted for publication in MNRAS