- Portada
- Volume 80 - Année 2011
- Single-Star HII Regions as a Probe of Massive Star SEDs
Vista(s): 298 (5 ULiège)
Descargar(s): 243 (8 ULiège)
Single-Star HII Regions as a Probe of Massive Star SEDs
Documento adjunto(s)
Anexidades
Abstract
We critically examine stellar atmosphere models by exploiting the strong dependence of HII region optical spectra on the SED of the ionizing source. To accomplish this, we compare spatially resolved, longslit observations of LMC single-star HII regions to photoionization simulations based on observed nebular and stellar properties. We select stellar atmosphere models from the CoStar (Schaerer & de Koter, 1997), TLUSTY (Lanz & Hubeny, 2003), WM-basic (Pauldrach et al. 2001) and Smith et. al. (2002) grids to define the ionizing source in our simulations. Gas density fluctuations are necessary to simultaneously fit the emission from high and low excitation ions. We evaluate the atmospheres relative to each other and overall, find atmosphere models using the WM-basic code have the best agreement with our observations.
Para citar este artículo
Acerca de: Jordan Zastrow
Department of Astronomy, 500 Church Street, University of Michigan, Ann Arbor, MI, 48109, USA
Acerca de: M.S. Oey
Department of Astronomy, 500 Church Street, University of Michigan, Ann Arbor, MI, 48109, USA
Acerca de: E.W. Pellegrini
Department of Astronomy, 500 Church Street, University of Michigan, Ann Arbor, MI, 48109, USA