A CH star in the globular cluster NGC 6426
M. Sharina, B. Aringer, E. Davoust, A. Y. Kniazev, C. J. Donzelli
TL;DR
This paper reports the discovery and analysis of a carbon-rich asymptotic giant branch star in the low-metallicity globular cluster NGC 6426, providing insights into its membership and chemical properties.
Contribution
It presents the first identification and detailed chemical characterization of a CH star in NGC 6426, using spectroscopic and photometric data.
Findings
Star confirmed as cluster member via radial velocity
Derived stellar parameters indicating a carbon-rich AGB star
Chemical analysis suggests low-metallicity environment
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.
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