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Date and Time of the Query: 2019-06-26 T23:45:42 PDT
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For refcode 2008MNRAS.385.1045M:
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Copyright by Royal Astronomical Society. 2008MNRAS.385.1045M Asymptotic giant branch stars in the Phoenix dwarf galaxy John Menzies, Michael Feast, Patricia Whitelock, Enrico Olivier, Noriyuki Matsunaga and Gary Da Costa Abstract. JHK_s_ 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 M_bol_ = -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 {DELTA}K_s_ ~ 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 K_s_, (J - K_s_) diagram needs studying. Key words: stars: AGB and post-AGB, stars: carbon, galaxies: dwarf, galaxies: stellar content
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