Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560607k&link_type=abstract
American Astronomical Society, AAS Meeting #215, #606.07; Bulletin of the American Astronomical Society, Vol. 36, p.1130
Mathematics
Logic
Scientific paper
We are constructing comprehensive grids of CMFGEN synthetic spectra, suitable for the analysis of spectroscopic data of post-Asymptotic Giant Branch (post-AGB) objects. We present initial results for Hydrogen deficient Central Stars of Planetary Nebulae (CSPN) migrating along the constant
luminosity branch of the Hertzsprung-Russell diagram. These grids are being produced with CMFGEN (Hillier & Miller 1998; Herald, Bianchi & Hillier 2005), a state-of-the-art stellar atmosphere code that properly treats the stellar winds, accounting for expanding atmospheres in non-LTE, line blanketing and wind clumping. The grids include many ionic species that have been previously neglected, providing a uniform set of models to fill a niche in an important parameter regime, i.e., high effective temperature, high surface gravity, and significant mass-loss. They will constitute a general tool to facilitate determination of the stellar parameters and
line identification and will allow the analysis of the morphological changes of the stellar spectrum as stars evolve through the CSPN phase. We also present an analysis of high resolution UV (STIS) and far-UV (FUSE) spectra of the hot Hydrogen deficient central star NGC6905, where we identified Ne VIII emission features (at the wavelengths 2820.7, 2860.1, and 2976.0 Å). We report on the derived stellar and wind parameters.
Herald, J. E., Bianchi, L., & Hillier, D. J. 2005, ApJ, 627, 424
Hillier, D. J., & Miller, D. L. 1998, ApJ, 496, 407
Acknowledgements: G.R. Keller acknowledges support from the Brazilian agency CAPES, grant 0370-09-6.
*G.R. Keller is a visiting graduate student at JHU, and a PhD candidate at the University of Sao Paulo, Brazil.
Bianchi Luciana
Herald James E.
Keller Graziela R.
Maciel Walter J.
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