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A CH star in the globular cluster NGC 6426

Authors

  • M. Sharina,

    Corresponding author
    1. Special Astrophysical Observatory, Russian Academy of Sciences, N. Arkhyz, KChR, 369167, Russia
      E-mail: sme@sao.ru
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  • B. Aringer,

    1. Department of Astronomy, University of Vienna, Türkenschanzstr. 17, A-1180 Wien, Austria
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  • E. Davoust,

    1. IRAP, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France
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  • A. Y. Kniazev,

    1. South African Astronomical Observatory, PO Box 9, 7935 Observatory, Cape Town, South Africa
    2. Southern African Large Telescope Foundation, PO Box 9, 7935 Observatory, Cape Town, South Africa
    3. Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia
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  • C. J. Donzelli

    1. Instituto de Investigaciones en Astronomía Teórica y Experimental (IATE), Observatorio Astronómico OAC, Laprida 854, X5000BGR, Córdoba, Argentina
    2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina
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E-mail: sme@sao.ru

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−1 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 asymptotic giant branch star.

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