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Date and Time of the Query: 2019-06-20 T08:45:11 PDT
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For refcode 1992PASP..104..408V:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
1992PASP..104..408V The Intrinsic Colors of Supernovae of Type Ia SIDNEY VAN DEN BERGH Dominion Astrophysical Observatory, National Research Council of Canada, 5071 West Saanich Road, Victoria, British Columbia V8X 4M6, Canada Electronic mail: vandenbergh@dao.nrc.ca MICHAEL J. PIERCE Kitt Peak National Observatory, National Optical Astronomy Observatories, 950 North Cherry Street, P.O. Box 26732, Tucson, Arizona 85726 Electronic mail: mpierce@noao.edu Received 1991 December 30; accepted 1992 March 6 ABSTRACT. The absolute magnitudes derived for supernovae of type Ia in spiral galaxies depend critically on their assumed intrinsic colors. For 14 SNIa in spirals (and an assumed Hubble parameter of 75 km s^-1^ Mpc^-1^) one finds that M_B_ (max) = -20.02+/- 0.17 if (B- V)_max_,= -0.25. This may be compared to M_B_(max) = - 18.97+/-0.28 for seven SNIa in E and SO galaxies which were assumed to have been unreddened. For (B-V)_max_ = -0.25, SNIa in spirals are therefore 1.05 +/- 0.32 mag more luminous than those in E and SO galaxies. However, this difference is reduced to 0.30+/-0.30 mag if (B-V)_max_ = 0.00 is adopted. It follows that SNIa are good standard candles only if (B-V)_max_ 0.0, in which case they are relatively faint at M_B_ (max)~ - 19.0. If they are blue with (B- V)_max_~ -0.25 then they exhibit different luminosity distributions, with M_B_ (max)~ -20.0 in spirals and M_B_ (max) = - 19.0 in E and SO galaxies. The Hubble diagram for the absorption-corrected maximum magnitudes of SNIa is found to have marginally smaller dispersion for a Virgocentric infall model than it does for a model without such infall.
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