Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..764h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 3/AUG1, P. 764, 1994
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Spectroscopic diagnostics of expanding supernova photospheres (in their coasting phase) require determination of at least six parameters which characterize the state of the emitting layers (effective temperature, photo spheric radius, density exponent, expansion velocity, microturbulence, and element abundances), i.e. two more than for a compact stellar atmosphere in hydrostatic equilibrium. Besides the larger set of parameters, the expansion process itself complicates the unambiguous interpretation of the spectrum considerably: the broadening and blending of lines correspond to a lower spectral resolution, and, in addition, the relativistic Doppler boosting inside the differentially expanding envelope mimics changes in the effective temperature. The effects of the expansion on the information content are quantified by calculating the apparent spectral information (ASI) of synthetic supernova spectra. We address the problem of the extent to which parameters can be determined from an observed spectrum (with prescribed AS I). Key words: line: profiles - methods: data analysis - supernovae: general.
Baschek Bodo
Hafner Meinrad
Wehrse Rainer
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