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For refcode 2001ApJ...547L.103G:
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Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...547L.103G Supernova 1991T and the Value of the Hubble Constant Brad K. Gibson Centre for Astrophysics and Supercomputing, Swinburne University, Mail 31, P.O. Box 218, Hawthorn, Victoria, 3122, Australia and Peter B. Stetson Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council, 5071 West Saanich Road, Victoria, BC, V9E 2E7, Canada Received 2000 August 22; accepted 2000 November 7; published 2001 January 22 ABSTRACT Based on multiepoch Hubble Space Telescope observations, we present the discovery of 16 high-quality Cepheid candidates in NGC 4527. Corrected for metallicity effects in the Cepheid period-luminosity relation, we derive a distance, including both random (r) and systematic (s) uncertainties, of 13.0 +/- 0.5(r) +/- 1.2(s) Mpc. Our result is then used to provide a calibration of the peak B-, V-, and I-band luminosities of the peculiar Type Ia supernova SN 1991T, a resident of NGC 4527. Despite its documented spectroscopic peculiarities, after correction for the decline rate- luminosity correlation, the corrected peak luminosity is indistinguishable from those of so-called "normal" Type Ia SNe. With nine local calibrators now at our disposal, we determine a robust value for the Hubble constant of H_0_ = 73 +/- 2(r) +/- 7(s) km s^-1^ Mpc^-1^. Subject headings: Cepheids-distance scale-galaxies: distances and redshifts-supernovae: general
Retrieve 18 NED objects in this reference.
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