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Supernova 1991T and the Value of the Hubble Constant | | Brad K. Gibson
; Peter B. Stetson
; | | Date: |
26 Nov 2000 | | Subject: | astro-ph | | Affiliation: | Swinburne), Peter B. Stetson (DAO | | Abstract: | Based upon multi-epoch Hubble Space Telescope observations, we present the discovery of sixteen 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 now nine local calibrators at our disposal, we determine a robust value for the Hubble Constant of H_0=73+/-2(r)+/-7(s) km/s/Mpc. | | Source: | arXiv, astro-ph/0011478 | | Services: | Forum | Review | PDF | Favorites | |
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