Cepheid Distances to SNe Ia Host Galaxies based on a Revised Photometric Zero-Point of the HST-WFPC2 and New P-L Relations and Metallicity Corrections

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dc.creatorSaha, A.
dc.creatorThim, F.
dc.creatorTammann, G. A.
dc.creatorReindl, B.
dc.creatorSandage, A.
dc.date2006-02-27
dc.date.accessioned2026-07-07T12:41:40Z
dc.date.available2026-07-07T12:41:40Z
dc.descriptionWith this paper we continue the preparation for a forthcoming summary report of our experiment with the Hubble Space Telescope (HST) to determine the Hubble constant using type Ia supernovae as standard candles. Two problems are addressed. (1) We examine the need for, and determine the value of, the corrections to the apparent magnitudes of our program Cepheids in the eleven previous calibration papers due to sensitivity drifts and charge transfer effects of the HST WFPC2 camera over the life time of the experiment from 1992 to 2001. (2) The corrected apparent magnitudes are applied to all our previous photometric data from which revised distance moduli are calculated for the eight program galaxies that are parents to the calibrator Ia supernovae. Two different Cepheid P-L relations are used; one for the Galaxy and one for the LMC. These differ both in slope and zero-point at a fixed period. The procedures for determining the absorption and reddening corrections for each Cepheid are discussed. Corrections for the effects of metallicity differences between the program galaxies and the two adopted P-L relations are derived and applied. The distance moduli derived here for the eight supernovae program galaxies, and for 29 others, average 0.20 mag fainter (more distant) than those derived by Gibson et al. and Freedman et al. in their 2000 and 2001 summary papers for reasons discussed in this paper. The effect on the Hubble constant is the subject of our forthcoming summary paper.
dc.description73 pages, 16 figures, 8 tables, accepted for publication in the Astrophysical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0602572
dc.identifierhttp://arxiv.org/abs/astro-ph/0602572
dc.identifierAstrophys.J.Suppl.165:108-137,2006
dc.identifierdoi:10.1086/503800
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219851
dc.subjectAstrophysics
dc.titleCepheid Distances to SNe Ia Host Galaxies based on a Revised Photometric Zero-Point of the HST-WFPC2 and New P-L Relations and Metallicity Corrections
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