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Date and Time of the Query: 2019-08-26 T02:54:17 PDT
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For refcode 1999ApJ...525..209T:
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Copyright by American Astronomical Society. Reproduced by permission
1999ApJ...525..209T DETERMINATION OF THE HUBBLE CONSTANT USING A TWO-PARAMETER LUMINOSITY CORRECTION FOR TYPE Ia SUPERNOVAE Robert Tripp Institute for Nuclear and Particle Astrophysics, Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 and David Branch Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 Received 1999 January 21; accepted 1999 January 25 ABSTRACT In this paper, we make a comprehensive determination of the Hubble constant H_0_ by using two parameters-the B-V color and the rate of decline {DELTA}m_15_-to simultaneously standardize the luminosities of all nearby Cepheid-calibrated Type Ia supernovae (SNe Ia) and those of a larger, more distant sample of 29 SNe Ia. Each group is treated in as similar a manner as possible in order to avoid systematic effects. A simultaneous {chi}^2^ minimization yields a standardized absolute luminosity of the Cepheid- calibrated supernovae as well as the Hubble constant obtained from the more distant sample. With an adopted LMC distance modulus of 18.50, we find H_0_ = 62 km s^-1^ Mpc^-1^ and a standardized absolute magnitude of -19.46. The sensitivity of H_0_ to a metallicity dependence of the Cepheid-determined distances is investigated. The total uncertainty {delta}H_0_, dominated by uncertainties in the primary distance indicators, is estimated to be 5 km s^-1^ Mpc^-1^. Subject heading: distance scale-supernovae: general
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