Asymptotic giant branch stars in the Phoenix dwarf galaxy

John Menzies*, Michael Feast, Patricia Whitelock, Enrico Olivier, Noriyuki Matsunaga, Gary Da Costa

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    32 Citations (Scopus)

    Abstract

    JHKs near-infrared photometry of stars in the Phoenix dwarf galaxy is presented and discussed. Combining these data with the optical photometry of Massey et al. allows a rather clean separation of field stars from Phoenix members. The discovery of a Mira variable (P = 425 d), which is almost certainly a carbon star, leads to an estimate of the distance modulus of 23.10 ± 0.18 that is consistent with other estimates and indicates the existence of a significant population of age ∼2 Gyr. The two carbon stars of Da Costa have Mbol = -3.8 and are consistent with belonging to a population of similar age; some other possible members of such a population are identified. A Da Costa non-carbon star is ΔKs ∼ 0.3 mag brighter than these two carbon stars. It may be an asymptotic giant branch star of the dominant old population. The nature of other stars lying close to it in the Ks, (J - Ks) diagram needs studying.

    Original languageEnglish
    Pages (from-to)1045-1052
    Number of pages8
    JournalMonthly Notices of the Royal Astronomical Society
    Volume385
    Issue number2
    DOIs
    Publication statusPublished - Apr 2008

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