The Peak Brightness of Supernovae in the U Band and the Hubble Constant

Details The Peak Brightness of Supernovae in the U Band and the Hubble Constant The Peak Brightness of Supernovae in the U Band and the Hubble Constant

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450l...5s&link_type=abstract

Astrophysical Journal Letters v.450, p.L5

Astronomy and Astrophysics

Astronomy

19

Cosmology: Observations, Cosmology: Distance Scale, Stars: Supernovae: General

Scientific paper

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.

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