A CH star in the globular cluster NGC 6426
arXiv:1207.4357 · doi:10.1111/j.1745-3933.2012.01317.x
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.
5 pages, accepted for publication in MNRAS
References in corpus (6)
- First science with SALT: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2
- Star Clusters with Primordial Binaries: I. Dynamical Evolution of Isolated Models
- Line formation in solar granulation VII. CO lines and the solar C and O isotopic abundances
- The metallicity extremes of the Sagittarius dSph using SALT spectroscopy of PNe
- The Rotation of Sub-Populations in omega Centauri
- CH stars at High Galactic Latitudes
Cited by in corpus (7)
- Carbon in Red Giants in Globular Clusters and Dwarf Spheroidal Galaxies
- Homogeneous metallicities and radial velocities for Galactic globular clusters. II. New CaT metallicities for 28 distant and reddened globular clusters
- The double RGB in M 2: C, N, Sr and Ba abundances
- The most metal-poor Galactic globular cluster: the first spectroscopic observations of ESO280-SC06
- Light Element Discontinuities Suggest an Early Termination of Star Formation in the Globular Cluster NGC 6402 (M14)
- Light Element Abundances and Multiple Populations in M53
- A Main Sequence CH-star in the globular cluster M55 (NGC 6809)