Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1632p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, no. 5, May 1992, p. 1632-1637, 1718.
Other
187
Stellar Composition, Stellar Evolution, Stellar Spectra, Supernovae, Light Curve, Stellar Color, Stellar Spectrophotometry
Scientific paper
Optical spectra of SN 1991T obtained approximately one week before B maximum showed no evidence of the Si, Ca, and S absorption lines which normally dominate the spectra of type Ia supernovae at early phases. Nevertheless, within two weeks after maximum, the spectrum of SN 1991T had evolved to resemble closely that of other type Ia events. These observations suggest that the abundances of Si, Ca, and S in the outer ejecta of SN 1991T were unusually low. The B and V light curves of SN 1991T resembled those of other type Ia supernovae, but the slope of the initial decline following maximum was less steep than normal in both colors. In spite of these spectroscopic and photometric peculiarities, the absolute magnitude of SN 1991T at B maximum was apparently similar to that of a typical type Ia event. Thus, although the data suggest that SN 1991T was a type Ia supernova with peculiar surface abundances, in most other ways it seems to have been a completely normal type Ia explosion.
Foltz Craig B.
Hamuy Mario
Kirshner Robert P.
Leibundgut Bruno
Phillips Marcia
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