Other
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421l..27j&link_type=abstract
Astrophysical Journal, Part 2 (ISSN 0004-637X), vol. 421, no 1, p. L27-L30
Other
35
H Alpha Line, Interstellar Extinction, Light (Visible Radiation), Radiative Heat Transfer, Spectrum Analysis, Stellar Envelopes, Supernovae, Ultraviolet Spectra, Charge Coupled Devices, Faint Objects, Hubble Space Telescope, Iue, Signal To Noise Ratios, Spectrographs, Wavelengths
Scientific paper
We obtained a Hubble Space Telescope (HST) ultraviolet spectrum of the Type II supernova SN 1993J in M81 on 1993 April 15. The approximately 1650-2900 A region is smoother than observed for SN 1987A and SN 1992A and lacks strong P Cygni absorptions caused by iron peak element lines. Synthetic spectra calculated using a parameterized Local Thermodynamic Equilibrium (LTE) procedure and a simple model atmosphere do not fit the UV region. Radio observations suggest that SN 1993J is embedded in a thick circumstellar envelope. The UV spectra of other supernovae that are believed to have thick circumstellar envelopes also have approximately 1650-2900 A regions lacking in strong P Cygni absorptions. Interaction of supernova ejecta and circumstellar matter may cause the smooth UV spectrum. If so, UV observations of supernovae will provide insight into the circumstellar environment of the supernova progenitors.
Branch David
Challis Peter M.
Chevalier Roger A.
Clocchiatti Alejandro
Filippenko Alexei V.
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