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For refcode 1995ApJ...450L...5S:
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Copyright by American Astronomical Society. Reproduced by permission
1995ApJ...450L...5S THE PEAK BRIGHTNESS OF SUPERNOVAE IN THE U BAND AND THE HUBBLE CONSTANT BRADLEY E. SCHAEFER Department of Physics, Yale University, P.O. Box 208121, New Haven, CT 06520-8121; schaefer@batsei.gsfc.nasa.gov Received 1995 April 4; accepted 1995 June 20 ABSTRACT The peak magnitudes of Type I supernovae in the U band can be used to answer various questions relating to supernovae and the Hubble constant: (1) Well-observed normal Type Ia supernovae are placed in a color-color diagram along the extinction line of (B - V) = 1.25(U - B) + 0.15 with a scatter of 0.1 mag in each color. (2) The peak B - V colors measured at the Asiago Observatory are far from this relation, hence supporting the earlier conclusions that these data are unreliable. (3) The intrinsic B - V at B peak of normal Type Ia events is 0.00 +/- 0.04 or perhaps slightly redder, hence implying that these are good standard candles. (4) The dereddened absolute magnitude in the U band at the time of B peak is - 18.88 +/- 0.15 for H_0_ = 75. (5) The U- and H-band light curves of SN 1972E yield low values for the Hubble constant. Subject headings: cosmology: observations - distance scale - supernovae: general
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