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• W2095299194 endingPage "74" @default.
• W2095299194 startingPage "74" @default.
• W2095299194 abstract "We present a comprehensive study of young stellar populations in six dwarf galaxies in or near the Local Group: Phoenix, Pegasus, Sextans A, Sextans B, WLM, and NGC 6822. Their star-forming regions, selected from GALEX wide-field far-UV imaging, were imaged (at sub-pc resolution) with the WFPC2 camera on board the Hubble Space Telescope (HST) in six bandpasses from far-UV to I to detect and characterize their hot massive star content. This study is part of HST treasury survey program HST-GO-11079; the general data characteristics and reduction procedures are detailed in this paper and results are presented for the first six galaxies. From a total of 180 HST images, we provide catalogs of the multi-band stellar photometry and derive the physical parameters of massive stars by analyzing it with model-atmosphere colors. We use the results to infer ages, number of massive stars, extinction, and spatial characteristics of the young stellar populations. The hot massive star content varies largely across our galaxy sample, from an inconspicuous presence in Phoenix and Pegasus to the highest relative abundance of young massive stars in Sextans A and WLM. Albeit to a largely varying extent, most galaxies show a very young population (a few Myrs, except for Phoenix), and older ones (a few 107 years in Sextans A, Sextans B, NGC 6822, and WLM, ∼108yr in Phoenix and Pegasus), suggesting discrete bursts of recent star formation in the mapped regions. The hot massive star content (indicative of the young populations) broadly correlates with the total galaxy stellar mass represented by the integrated optical magnitude, although it varies by a factor of ∼3 between Sextans A, WLM, and Sextans B, which have similar MV. Extinction properties are also derived." @default.
• W2095299194 created "2016-06-24" @default.
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• W2095299194 date "2012-02-14" @default.
• W2095299194 modified "2023-09-27" @default.
• W2095299194 title "A TREASURY STUDY OF STAR-FORMING REGIONS IN THE LOCAL GROUP. I.<i>HST</i>PHOTOMETRY OF YOUNG POPULATIONS IN SIX DWARF GALAXIES" @default.
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• W2095299194 doi "https://doi.org/10.1088/0004-6256/143/3/74" @default.
• W2095299194 hasPublicationYear "2012" @default.
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