Calibration of the distance scale from galactic Cepheids:II Use of the HIPPARCOS calibration

Abstract

New estimate of the distances of 36 nearby galaxies is presented. It is based on the calibration of the V- and I-band Period-Lumi- nosity relations for galactic Cepheids measured by the HIPPARCOS mission. The distance moduli are obtained in a classical way. The statistical bias due to the incompleteness of the sample is corrected according to the precepts introduced by Teerikorpi (1987). We adopt a constant slope (the one obtained with LMC Cepheids). The correction for incompleteness bias introduce an uncertainty which depends on each galaxy. On the mean, this uncertainty is small (0.04 mag) but it may reach 0.3 mag. We show that the un- certainty due to the correction of the extinction is small (propably less than 0.05 mag.). The correlation between the metallicity and the morphological type of the host galaxy sug- gests us to reduce the application to spiral galaxies in order to bypass the problem of metallicity. We suspect that the adopted PL slopes are not valid for all morphological types of galaxies. This may induce a mean systematic shift of 0.1 mag on distance moduli. A comparison with the distance moduli recently published by Freedman et al. (2001) shows there is a reasonably good agreement with our distance moduli.

Accepted for Astron & Astrophys. (2002) Cepheid database available at ftp://www-obs.univ-lyon1.fr via anonymous ftp. Directory: pub/base/CEPHEIDES.tar.gz

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• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• A revised Cepheid distance to NGC 4258 and a test of the distance scale
• Calibration of the distance scale from galactic Cepheids: I Calibration based on the GFG sample

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