Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325l..33p&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. L33, L34. Research supported
Astronomy and Astrophysics
Astrophysics
9
Photosphere, Radial Velocity, Stellar Models, Supernovae, Variability, Spectrum Analysis, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution, Stellar Spectra
Scientific paper
The high photospheric velocity of 16,300 km/s observed in SN Ia 1984A near maximum light has been interpreted by Branch (1987) to be indicative of an intrinsic variation of SN 1984A in the class of Type Ia supernovae. The excess velocity of SN 1984A as compared to that of the well-observed prototype SN 1981B (12,000 km/s) is believed to be caused by the expected evolution of the photospheric velocity with time as t exp -3. The high velocity observed is consistent with optical maximum occurring on Jan. 18, 19, 1984 instead of Branch's adopted date of January 15 + or - 1. A reanalysis of optical and IR data shows a January 18, 19 date of maximum to be consistent. Thus, the high velocity observed in SN 1984A is indicative of the expected evolution of the photospheric velocity and not an inhomogeneity of Type Ia supernovae.
Colgate Stirling A.
Pearce Eric C.
Petschek Albert G.
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