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For refcode 1996AJ....112.2391H:
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1996AJ....112.2391H THE ABSOLUTE LUMINOSITIES OF THE CALAN/TOLOLO TYPE Ia SUPERNOVAE MARIO HAMUY, M. M. PHILLIPS, ROBERT A. SCHOMMER, AND NICHOLAS B. SUNTZEFF National Optical Astronomy Observatories, Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile Electronic mail: mhamuy@as.arizona.edu, mphillips@noao.edu, rschomrner@noao.edu, nsuntzeff@noao.edu JOSE MAZA Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile Electronic mail: jmaza@das.uchile.cl R. AVILES National Optical Astronomy Observatories, Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile Received 1996 January 10; revised 1996 September 5 ABSTRACT We examine the absolute luminosities of 29 SNe Ia in the Calan/Tololo survey. We confirm a relation between the peak luminosity of the SNe and the decline rate as measured by the light curve, as suggested by Phillips [ApJ, 413, L105 (1993)]. We derive linear slopes to this magnitude- decline rate relation in BV(I)_KC_ colors, using a sample with B_MAX_ - V_MAX_ < 0.2^m^. The scatter around this linear relation (and thus the ability to measure SNe Ia distances) ranges from 0.13^m^ (in the I band) to 0.17^m^ (in the B band). We also find evidence for significant correlations between the absolute magnitudes or the decline rate of the light curve, and the morphological type of the host galaxy.
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