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Title

Supernova 1991T and the value of the hubble constant

Author(s)

Gibson, Brad K.;  Stetson, Peter B.

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 H0=73+/-2(r)+/-7(s) km s-1 Mpc-1.

Publication type

Journal article

Research centre

Swinburne University of Technology. School of Biophysical Science and Electrical Engineering. Centre for Astrophysics and Supercomputing

Source

Astrophysical journal, Vol. 547, no. 2 (Feb. 2001), pp. L103-L106

Publication year

2001

Keyword(s)

Stars: Variables: Cepheids;  Cosmology: Distance Scale;  Galaxies: Distances and Redshifts;  Stars: Supernovae: General

Publisher

University of Chicago Press

Format

pp. L103-L106

ISSN

0004-637X

Publisher URL

Astrophysical journal

Publisher URL

http://dx.doi.org/10.1086/318905

Copyright

Copyright © 2001 The American Astronomical Society. Reproduced in accordance with the copyright policy of the publisher.

Full text

Peer reviewed