Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-29
Astronomy and Astrophysics
Astrophysics
9 Pages, 7 figures, accepted for MNRAS
Scientific paper
10.1111/j.1365-2966.2008.12907.x
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 days), 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 Ks~0.3 mag brighter than these two carbon stars. It may be an AGB star of the dominant old population. The nature of other stars lying close to it in the Ks,(J-Ks) diagram needs studying.
Costa Gary Da
Feast Michael
Matsunaga Noriyuki
Menzies John
Olivier Enrico
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