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The Status of the Distance Scale1

Published online by Cambridge University Press:  12 April 2016

G. A. Tammann ,
B. R. Parodi  and
B. Reindl
G. A. Tammann
Affiliation:
Astronomisches Institut der Universität Basel, Venusstr. 7, CH-4102 Binningen, Switzerland
B. R. Parodi
Affiliation:
Astronomisches Institut der Universität Basel, Venusstr. 7, CH-4102 Binningen, Switzerland
B. Reindl
Affiliation:
Astronomisches Institut der Universität Basel, Venusstr. 7, CH-4102 Binningen, Switzerland

Abstract

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Cepheids are the pillar of the extragalactic distance scale, but their reach in distance is not sufficient to calibrate H0 Yet HST has provided Cepheid distances to eight galaxies which have produced SNe la. The latter are used as nearly perfect standard candles to carry the distance scale to 30 000 km s−1, giving H0 = 58 ± 5. This determination finds support in other methods, but its range in distance and its weight is unparalleled.

Type
Part 3. Cepheids, RR Lyrae Stars, Distance Scales
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 216 - 227
Copyright
Copyright © Astronomical Society of the Pacific 2000

Footnotes

1

A report on the “HST SNe la Calibration Program for the Hubble Constant” by A. Sandage, A. Saha, L. Labhardt, N. Panagia, F. D Macchetto, & G. A. Tammann)

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