Premaximum observations of the type IA SN 1990N

Details Premaximum observations of the type IA SN 1990N Premaximum observations of the type IA SN 1990N

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371l..23l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 371, April 10, 1991, p. L23-L26.

Astronomy and Astrophysics

Astronomy

144

Stellar Spectra, Supernovae, Ultraviolet Astronomy, Ultraviolet Spectra, Astronomical Maps, Astronomical Photometry, Astronomical Spectroscopy, Visible Spectrum

Scientific paper

Spectroscopic and photometric observations of SN 1990N were obtained at ultraviolet and optical wavelengths, beginning 14 days before maximum light. The early observations reveal important differences from spectra of SN Ia's around maximum light. Photometry and spectroscopy obtained after maximum show that SN 1990N is a typical SN Ia and that most of the observed differences are due to the early epoch of the observations. The most significant characteristics are (1) the high velocities of Ca and Si up to 22,000 km/s; (2) the presence of Co and Fe 2 weeks before maximum; and (3) the more rapid increase in the UV flux compared to the optical. The most popular models for white dwarf deflagration that have provided the standard interpretation for SN Ia's at maximum light do not reproduce the high velocities of Ca II and Si II lines observed in SN 1990N.

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