Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316l..81b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 316, May 15, 1987, p. L81-L83.
Astronomy and Astrophysics
Astrophysics
70
Homogeneity, Light (Visible Radiation), Stellar Spectra, Supernovae, Error Analysis, Spectrum Analysis, Velocity Distribution
Scientific paper
An optical spectrum of the Type Ia supernova 1984a in NGC 4419, obtained shortly before maximum light by Wegner and McMahan (1987), shows definite differences from the maximum-light spectrum of the well-observed Type Ia supernova 1981b in NGC 4536. Synthetic-spectrum calculations are used to infer that the velocity at the photosphere was 4300 km/s higher in SN 1984a than in SN 1981b. The spectrum of SN 1984a shows evidence for some matter moving as fast as 35,000 km/s. The Wegner-McMahan spectrum settles the long-debated question of whether the intrinsic properties of all Type Ia supernovae are practically identical - they are not. Some of the implications of the heterogeneity for empirical and theoretical studies of Type Ia supernovae are briefly discussed.
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