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The H0 Key Project: Cepheids in NGC925, M101 and M100

Published online by Cambridge University Press:  12 April 2016

S. M. G. Hughes
S. M. G. Hughes*
Affiliation:
Royal Greenwich Observatory, Madingley Road, Cambridge, UK

Abstract

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As part of the Extragalactic Distance Scale Key Project, the Hubble Space Telescope has been used to identify Cepheids in M100, M101 and NGC925, and to measure distances derived from the Cepheid PL relation. For M100, the distance of 17.1 ± 1.8 Mpc has been used to infer a preliminary value for H0 of ~ 80 km/s/Mpc, which brings the age of the Universe derived from the standard model of the Big Bang into conflict with the ages of the oldest stars.

Type
Part 1. The Scientific Programme
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 258 - 259
Copyright
Copyright © Astronomical Society of the Pacific 1995

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