Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-08-29
Astronomy and Astrophysics
Astrophysics
Accepted by AJ, 22 pages including 6 figures + 1 figure in JPEG format
Scientific paper
10.1086/316844
We present HST/WFPC2 photometry of the central regions of the Phoenix dwarf. Accurate photometry allows us to: 1) confirm the existence of the horizontal branch previously detected by ground-based observations, and use it to determine a distance to Phoenix, 2) clearly detect the existence of multiple ages in the stellar population of Phoenix, 3) determine a mean metallicity of the old red giant branch stars in Phoenix, and suggest that Phoenix has evolved chemically over its lifetime, 4) extract a rough star formation history for the central regions which suggests that Phoenix has been forming stars roughly continuously over its entire lifetime.
Grillmair Carl C.
Holtzman Jon A.
Smith Graeme H.
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