NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T04:48:05 PDT
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For refcode 2006AJ....131..849P:
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Copyright by American Astronomical Society. Reproduced by permission
2006AJ....131..849P Massive Stellar Content of Giant H II Regions in M33 and M101 Anne Pellerin Abstract. Far-ultraviolet (900 -- 1200 Angstrom) spectral synthesis of nine giant extragalactic H II regions in M33 and M101 is performed to study their massive stellar content. Several parameters are quantified, predicted, and compared to the literature: age, stellar mass, initial mass function (IMF) slope, number of O-type and Wolf-Rayet stars, and H{alpha} and 5500 Angstrom continuum fluxes. The results of this particular technique are consistent with other methods and observations. This work shows that a total stellar mass of a few 10^3^ M_sun_ is needed to populate the IMF bins well enough at high masses to obtain accurate results from the spectral synthesis technique in the far-ultraviolet. A flat IMF slope seems to characterize better the stellar line profiles of these objects, which is likely the first sign of a small number statistics effect on the IMF. Finally, the H II region NGC 5461 is identified as a good candidate for hosting a second generation of stars, not yet seen at far-ultraviolet wavelengths. Key words: Galaxies: Individual: M33, Galaxies: Individual: M101, Galaxies: Stellar Content, Stars: Early-Type, Ultraviolet: Stars
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