Variable stars in metal-rich globular clusters. IV. long-period variables in NGC 6496

Mohamad A. Abbas, Andrew C. Layden, Katherine A. Guldenschuh, D. E. Reichart, K. M. Ivarsen, J. B. Haislip, M. C. Nysewander, A. P. Lacluyze, Douglas L. Welch

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present VI-band photometry for stars in the metal-rich globular cluster NGC 6496. Our time-series data were cadenced to search for long-period variables (LPVs) over a span of nearly two years, and our variability search yielded the discovery of 13 new variable stars, of which 6 are LPVs, 2 are suspected LPVs, and 5 are short-period eclipsing binaries. An additional star was found in the ASAS database, and we clarify its type and period. We argue that all of the eclipsing binaries are field stars, while five to six of the LPVs are members of NGC 6496. We compare the period-luminosity distribution of these LPVs with those of LPVs in the Large Magellanic Cloud and 47 Tucanae, and with theoretical pulsation models. We also present a VI color-magnitude diagram, display the evolutionary states of the variables, and match isochrones to determine a reddening of E (B - V) = 0.21 ± 0.02 mag and apparent distance modulus of 15.60 ± 0.15 mag.

    Original languageEnglish (US)
    Article number40
    JournalAstronomical Journal
    Volume149
    Issue number2
    DOIs
    StatePublished - Feb 1 2015

    Keywords

    • Globular clusters: individual (ngc 6496)
    • Stars: horizontal-branch
    • Stars: variables: general

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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