The peak brightness of SN 1937C in IC 4182 and the Hubble constant: Comments on Pierce & Jacoby [AJ, 110, 2885 (1995)]
Document Type
Article
Publication Date
4-1-1996
Abstract
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. © 1996 American Astronomical Society.
Publication Source (Journal or Book title)
Astronomical Journal
First Page
1668
Last Page
1674
Recommended Citation
Schaefer, B. (1996). The peak brightness of SN 1937C in IC 4182 and the Hubble constant: Comments on Pierce & Jacoby [AJ, 110, 2885 (1995)]. Astronomical Journal, 111 (4), 1668-1674. https://doi.org/10.1086/117906
