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For refcode 1999AJ....118.1766P:
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1999AJ....118.1766P THE REDDENING-FREE DECLINE RATE VERSUS LUMINOSITY RELATIONSHIP FOR TYPE Ia SUPERNOVAE M. M. PHILLIPS Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile PAULINA LIRA Department of Physics & Astronomy, University of Leicester, Leicester, LE1 7RH, U.K. NICHOLAS B. SUNTZEFF AND R. A. SCHOMMER Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories,1 Casilla 603, La Serena, Chile MARIO HAMUY University of Arizona, Steward Observatory, Tucson, Arizona 85721 AND JOSE MAZA Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile Received 1999 January 27; accepted 1999 July 1 ABSTRACT We develop a method for estimating the host galaxy dust extinction for type Ia supernovae based on an observational coincidence first noted by Lira, who found that the B-V evolution during the period from 30 to 90 days after V maximum is remarkably similar for all events, regardless of light- curve shape. This fact is used to calibrate the dependence of the B_max_- V_max_ and V_max_-I_max_ colors on the light-curve decline rate parameter {DELTA}m_15_(B), which can, in turn, be used to separately estimate the host galaxy extinction. Using these methods to eliminate the effects of reddening, we reexamine the functional form of the decline rate versus luminosity relationship and provide an updated estimate of the Hubble constant of H_0_ = 63.3 +/- 2.2(internal) +/- 3.5(external) km s^-1^ Mpc^- 1^. Key words: distance scale-supernovae: general
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