Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.7810b&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #78.10; Bulletin of the American Astronomical Society, Vol. 32, p.1531
Astronomy and Astrophysics
Astronomy
Scientific paper
To serve as spectral templates of young, low-metallicity populations, high-resolution, high-quality, ultraviolet (STIS) and optical spectra of several main-sequence O stars in NGC 346 have been obtained. Stellar parameters and abundance of light elements are derived from the optical spectrum using NLTE, line-blanketed, photospheric models calculated with TLUSTY. In addition, the UV spectrum is analyzed with the NLTE, line-blanketed wind model code, CMFGEN, to derive wind parameters (mass-loss rate, clumping properties, terminal velocity). Iron abundances, derived from fitting Fe 4 and Fe 5 lines with the two NLTE codes, compare favorably. We achieve good matches of the observed spectra, thus supporting our modeling work of spectra of starburst galaxies at high redshift. We finally discuss the dependence of the mass-loss rate in terms of metallicity and luminosity. This work was supported through a NASA/NRC RA award and STScI grants (GO 7437, AR 7985).
Bouret Jean-Claud
Evans John C. Jr.
Heap Sally R.
Hillier Desmond John
Hubeny Ivan
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