The peak brightness of supernovae in the u band and the hubble constant

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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 H0= 75. (5) The U- and H-band light curves of SN 1972E yield low values for the Hubble constant. © 1995 IOP Publishing Ltd.

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Astrophysical Journal

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