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For refcode 1999AJ....117.1175S:
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1999AJ....117.1175S OPTICAL LIGHT CURVE OF THE TYPE Ia SUPERNOVA 1998bu IN M96 AND THE SUPERNOVA CALIBRATION OF THE HUBBLE CONSTANT NICHOLAS B. SUNTZEFF Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories,1 Casilla 603, La Serena, Chile; nsuntzeff@noao.edu M. M. PHILLIPS Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile R. COVARRUBIAS, M. NAVARRETE, J. J. PEREZ, A. GUERRA, AND M. T. ACEVEDO Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories,1 Casilla 603, La Serena, Chile LAURANCE R. DOYLE SETI Institute, MS 245-3, NASA Ames Research Center, Moffett Field, CA 94035 THOMAS HARRISON Department of Astronomy, New Mexico State University, Box 30001, Department 4500, Las Cruces, NM 88003 STEPHEN KANE AND KNOX S. LONG Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 JOSE MAZA Departamento Astronomma, Universidad de Chile, Casilla 36-D, Santiago, Chile SCOTT MILLER Department of Astronomy, University of Maryland, College Park, MD 20742 ANDRIS E. PIATTI, JUAN J. CLARIA, AND ANDREA V. AHUMADA Observatorio Astronomico de Cordoba, Laprida 854, 5000 Cordoba, Argentina BARTON PRITZL Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 AND P. FRANK WINKLER Department of Physics, Middlebury College, Middlebury, VT 05753 Received 1998 September 9; accepted 1998 October 26 ABSTRACT We present the UBV(RI)_KC_ light curves of the Type Ia supernova SN 1998bu, which appeared in the nearby galaxy M96 (NGC 3368). M96 is a spiral galaxy in the Leo I group that has a Cepheid-based distance. Our photometry allows us to calculate the absolute magnitude and reddening of this supernova. These data, when combined with measurements of the four other well-observed supernovae with Cepheid-based distances, allow us to calculate the Hubble constant with respect to the Hubble flow defined by the distant Calan/Tololo Type Ia sample. We find a Hubble constant of 63.9 +/- 2.2(internal) +/- 3.5(external) km s^-1^ Mpc^-1^, consistent with most previous estimates based on Type Ia supernovae. We note that the two well- observed Type Ia supernovae in Fornax, if placed at the Cepheid distance to the possible Fornax spiral NGC 1365, are apparently too faint with respect to the Calan/Tololo sample calibrated with the five Type Ia supernovae with Cepheid distances to the host galaxies. Key words: distance scale-galaxies: individual (NGC 3368)-supernovae: general-supernovae: individual (SN 1998bu)
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