Stellar populations in the Phoenix dwarf (dIrr/dSph) galaxy as observed by Hubble Space Telescope WFPC2

被引：39

作者：

Holtzman, JA

Smith, GH

Grillmair, C

机构：

[1] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA

[2] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[3] Lick Observ, Santa Cruz, CA 95064 USA

[4] CALTECH, SIRTF Sci Ctr, Pasadena, CA 91125 USA

来源：

ASTRONOMICAL JOURNAL | 2000年 / 120卷 / 06期

关键词：

galaxies : dwarf; galaxies : stellar content;

D O I：

10.1086/316844

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：3060 / 3069

页数：10

共 39 条

[1] REDDENINGS DERIVED FROM H-1 AND GALAXY COUNTS - ACCURACY AND MAPS [J].