The Peak Brightness of SN 1937C in IC 4182 and the Hubble Constant: Comments on Pierce & Jacoby [AJ, 110, 2885 (1995)]

Details The Peak Brightness of SN 1937C in IC 4182 and the Hubble Constant: Comments on Pierce & Jacoby [AJ, 110, 2885 (1995)] The Peak Brightness of SN 1937C in IC 4182 and the Hubble Constant: Comments on Pierce & Jacoby [AJ, 110, 2885 (1995)]

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111.1668s&link_type=abstract

Astronomical Journal v.111, p.1668

Astronomy and Astrophysics

Astronomy

21

Supernovae: Individual: Sn 1937C, Distance Scale

Scientific paper

The peak brightness of SN 1937C in IC 4182 is important as a calibrator of type Ia supernovae absolute magnitudes. Recently, Pierce & Jacoby [AJ, 110,2885 (1995)] have remeasured some original plates with a scanning microdensitometer and have deduced a peak magnitude and decline rate. Unfortunately, a technical error (relating to day/night vision and the appropriate color correction term) has introduced a large and variable systematic error into all their photovisual magnitudes. In addition, their early remeasured photographic magnitudes are -0.25 mag fainter than those measured by all eight independent observers as well as -0.20 mag fainter than the original measurements of the same plates by Baade and Zwicky. Finally, Pierce and Jacoby deduced the peak magnitude with only 13% of the available data. In this paper, I present an improved analysis using the latest magnitude estimates, analysis techniques, and calibrations. I find the peak B magnitude to be 8.71+/-0.16 at JD2428769.7, while the peak V magnitude was 8.75+/-0.10. The decline in the B light curve over the first 15 days after maximum was 1.07+/-0.11 mag. This leads to a Hubble constant of 57+/-4 km s^-1^ Mpc^-1^.

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