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- W2045272214 endingPage "137" @default.
- W2045272214 startingPage "108" @default.
- W2045272214 abstract "With this paper we continue the preparation for a forthcoming summary report of our experiment with the 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 11 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." @default.
- W2045272214 created "2016-06-24" @default.
- W2045272214 creator A5023771022 @default.
- W2045272214 creator A5044660280 @default.
- W2045272214 creator A5053716982 @default.
- W2045272214 creator A5060282441 @default.
- W2045272214 creator A5077567865 @default.
- W2045272214 date "2006-07-01" @default.
- W2045272214 modified "2023-10-18" @default.
- W2045272214 title "Cepheid Distances to SNe Ia Host Galaxies Based on a Revised Photometric Zero Point of the <i>HST</i> WFPC2 and New PL Relations and Metallicity Corrections" @default.
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- W2045272214 doi "https://doi.org/10.1086/503800" @default.