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Stellar Populations in the Phoenix Dwarf (dIrr/dSph) Galaxy as Observed by HST/WFPC2 | | Jon A. Holtzman
; Graeme H. Smith
; Carl Grillmair
; | | Date: |
30 Aug 2000 | | Subject: | astro-ph | | Affiliation: | NMSU), Graeme H. Smith (UCO/Lick), Carl Grillmair (SIRTF Science Center | | Abstract: | 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. | | Source: | arXiv, astro-ph/0008468 | | Services: | Forum | Review | PDF | Favorites | |
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