Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915020k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #150.20; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present synthetic spectra of the Type Ib supernova (SN) 1999dn. Using the generalized, non-local thermodynamic equilibrium (NLTE), stellar atmosphere code PHOENIX, we fit model spectra to six different epochs of 1999dn, ranging from ten days before maximum brightness in the R band to 38 days afterward. The models are highly parameterized massive stars with their hydrogen envelopes removed. We largely focus on determining the identity of a feature near 6300 Å, attributed to hydrogen by some previous studies. We present synthetic spectra of models that do not include hydrogen, examining possible alternatives to this identification. These models fit the overall shape of the spectra well, and increasing the metallicity of the model composition to be three times that of the sun produces the 6300 Å feature well. However, we cannot rule out the presence of hydrogen, and future models will include a hydrogen envelope.
This work has been supported by NSF grants AST-0204771 and AST-0506028, and NASA grant NNG04GD36G.
Baron Eddie
Ketchum Wesley R.
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