Young stellar populations in the local group: an HST and GALEX comprehensive study |
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| Authors: | L Bianchi Y B Kang B Efremova D Thilker P Hodge P Massey K Olsen |
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| Institution: | 1.Departmet of Physics and Astronomy,The Johns Hopkins University,Baltimore,USA;2.Department of Astronomy & Space Science,Chungnam National University,Daejeon,Republic of Korea;3.University of WA,Seattle,USA;4.Lowell Observatory,Flagstaff,USA;5.KPNO,Tucson,USA |
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| Abstract: | The study of the stellar constituents of star-forming sites in a wide variety of conditions yields the key to interpreting
wide-field UV-optical imaging of extended nearby galaxies, and of distant galaxies. We obtained six-band imaging (from far-UV
to I) with HST-WFPC2 of 67 sites of recent star formation in eight Local Group galaxies. HST pointings were selected from
GALEX wide-field FUV imaging, which traces the young stellar populations. The HST observations were optimized to characterize
the hottest, most massive stars in these regions. From the HST photometry, analyzed with stellar model colors, we derived
the physical parameters of the massive stars in each field, and of the extinction by interstellar dust. The HST results are
used to interpret GALEX UV measurements of SF across the entire galaxies. Our comprehensive photometric study at HST resolution
(sub-pc scale in these galaxies) also provides an ideal selection of targets for follow-up spectroscopy with large ground-based
telescopes, and in the UV with HST- or WSO-class telescopes, to clarify the influence of metallicity on the properties and
the evolution of massive stars. |
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