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Date and Time of the Query: 2019-06-19 T08:26:09 PDT
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For refcode 2000AJ....120.3060H:
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2000AJ....120.3060H STELLAR POPULATIONS IN THE PHOENIX DWARF (dIrr/dSph) GALAXY AS OBSERVED BY HUBBLE SPACE TELESCOPE WFPC2 JON A. HOLTZMAN, GRAEME H. SMITH, AND CARL GRILLMAIR Received 2000 May 17; accepted 2000 August 17 ABSTRACT We present Hubble Space Telescope Wide Field Planetary Camera 2 photometry of the central regions of the Phoenix dwarf galaxy. 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, and (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. Key words: galaxies: dwarf-galaxies: stellar content
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