Other
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975azh....52..673m&link_type=abstract
Astronomicheskii Zhurnal, vol. 52, July-Aug. 1975, p. 673-681. In Russian.
Other
4
Light Curve, Metallic Stars, Stellar Spectrophotometry, Supernovae, Astronomical Models, Brightness Temperature, Stellar Temperature, Ubv Spectra
Scientific paper
Photometric and spectrophotometric data on Type I supernova (SN I) are analyzed to study the temporal behavior of the temperature, radius, photosphere, and bolometric luminosity of these objects. The color and spectrophotometric temperatures of supernova 1972e are compared, and it is found that the two temperatures are roughly equal during and before the light maximum, but the color temperature is less than the other one after maximum. This difference is attributed to the major role of metal lines in the extinction of the short-wave part of the spectrum of SN I, which is significant for temperatures not exceeding 10,000 K. The radius of a SN I is found to increase linearly at the light maximum, attain its greatest value about 30 to 35 days later, and then rather quickly decrease. It is shown that the expansion rate of a SN I photosphere is about two times less than that of its shell. Initial moments of expansion are extrapolated for supernovae 1972e and 1970j, and arguments are presented in favor of the conclusion that an SN I approaches its bolometric maximum considerably earlier than its visual maximum.
Chugai Nikolai
Mustel E. R.
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