Abstract
view Abstract Citations (96) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The envelopes of type II supernovae. Kirshner, R. P. ; Kwan, J. Abstract Absolute spectral energy distributions of Type II supernovae have been used to derive a consistent physical picture of their ejected envelopes. Continuum observations are consistent with a photosphere that expands to a radius of 10' cm and then begins to shrink at nearly constant temperature. The hydrogen recombination implies an electron density which decreases from 1010 to 2 >c 10 in a time of 400 days. A total hydrogen mass in excess of 1 M0 is required to prevent rapid recombination in the envelope. The Ca ii lines at AA8600 and 7300 are produced collisionally: an explicit calculation of the emissivity demonstrates that the line ratios and strengths are consistent with solar abundances, a total mass of a few solar masses, and the electron density derived from hydrogen recombination. Similarly, the [0 1] A6300 emission is consistent with this general picture. A quantitative analysis of line optical depths confirms the identifications of Na I A5890, Mg I A5174, and the Fe ii blends near AA4600 and 5100. A possible identification of K I A7677 is suggested, while other candidates are rejected. Subject headings: Ca ii emission - spectrophotometry - supernovae Publication: The Astrophysical Journal Pub Date: April 1975 DOI: 10.1086/153527 Bibcode: 1975ApJ...197..415K full text sources ADS | data products NED (7) SIMBAD (3)
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