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Cepheids in IC 4182, Calibration of SNIa 1937C and the Hubble constant

Published online by Cambridge University Press:  15 February 2018

A. Saha ,
A. Sandage ,
N. Panagia ,
G. A. Tammann ,
L. Labhardt ,
H. Schwengeler  and
F. D. Macchetto
A. Saha
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA
A. Sandage
Affiliation:
Observatories of the Carnegie Institution of Washington, Pasadena, CA, USA
N. Panagia
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA
G. A. Tammann
Affiliation:
Universitat Basel, Basel, Switzerland
L. Labhardt
Affiliation:
Universitat Basel, Basel, Switzerland
H. Schwengeler
Affiliation:
Universitat Basel, Basel, Switzerland
F. D. Macchetto
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA

Abstract

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Observations with the Wide Field Camera on HST were examined, and 27 Cepheids were discovered. Photometry and period analysis have produced unambiguous light curves free of alias. The observed P-L relation has a slope consistent with seminal calibration studies of Galactic and LMC Cepheids. An apparent distance modulus (in V) of 28.47 ± 0.10 to IC 4182 is derived. This implies that Mv(max) for SNIa 1937C is -19.92 ± 0.2 mag, independent of everything except differential absorption between the Cepheids and the supernova. Using this to calibrate Hubble diagrams for SNIa by several authors, and allowing for a 1-σ uncertainty in the absolute magnitude from the calibration of only one SNIa, we obtain H0 = 45 ± 14kms-1Mpc-1.

Type
Variable Stars as Distance Indicators
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 53 - 60
Copyright
Copyright © Cambridge University Press 1993

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