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Title:
The distance to the type IA supernova 1972E and its parent galaxy NGC 5253: A prediction
Authors:
Branch, David; Fisher, Adam; Herczeg, Tibor J.; Miller, Douglas L.; Nugent, Peter
Affiliation:
AA(University of Oklahoma, Norman, OK, US), AB(University of Oklahoma, Norman, OK, US), AC(University of Oklahoma, Norman, OK, US), AD(University of Oklahoma, Norman, OK, US), AE(University of Oklahoma, Norman, OK, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 421, no. 2, p. L87-L90 (ApJL Homepage)
Publication Date:
02/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Distance, Galaxies, Interstellar Extinction, Photometry, Spectroscopic Analysis, Supernovae, Hubble Space Telescope, Light Curve, Luminosity, Planetary Nebulae, Stellar Magnitude
DOI:
10.1086/187194
Bibliographic Code:
1994ApJ...421L..87B

Abstract

Sandage et al. have used the Hubble Space Telescope (HST) to obtain a Cepheid-based distance to IC 4182, the parent galaxy of the Type Ia SN 1937C, and intend to do the same for NGC 5253, the parent galaxy of the Type Ia SN 1972E. In an attempt to test the predictive power of Type Ia supernovae as distance indicators, we compare the observational properties of SNs 1937C and 1972E and consider the possibility of intrinsic differences between them. A naive application of a relation between absolute magnitude and postpeak decline rate implies that SN 1972E was intrinsically brighter than SN 1937C and at a distance of 5.2 +/- 0.6 Mpc. However, because SNs 1937C and 1972E were spectroscopically normal we expect their absolute magnitudes to have been similar and the NGC 5253 distance to be 4.4 +/- 0.4 Mpc.

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