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Baade–Wesselink Analysis of Magellanic Cloud Cepheids

Published online by Cambridge University Press:  12 April 2016

Jesper Storm ,
Bruce W. Carney ,
Wolfgang P. Gieren ,
Pascal Fouqué  and
Anne M. Fry
Jesper Storm
Affiliation:
Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by AURA, Inc. under cooperative agreement with the National Science Foundation Visiting Astronomer, Las Campanas Observatory Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
Bruce W. Carney
Affiliation:
Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by AURA, Inc. under cooperative agreement with the National Science Foundation Visiting Astronomer, Las Campanas Observatory University of North Carolina at Chapel Hill, North Carolina, USA
Wolfgang P. Gieren
Affiliation:
Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by AURA, Inc. under cooperative agreement with the National Science Foundation Visiting Astronomer, Las Campanas Observatory Visiting Astronomer, European Southern Observatory Universidad de Concépcion, Concépcion, Chile
Pascal Fouqué
Affiliation:
European Southern Observatory, Santiago, Chile
Anne M. Fry
Affiliation:
Case Western Reserve University, Ohio, USA

Abstract

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We apply the Barnes–Evans variant of the Baade–Wesselink method to Cepheids in the LMC and SMC in an attempt to determine the distance directly to individual stars in these galaxies and to determine the metallicity effect on the Cepheid period–luminosity relation. We now have K-band light curves for a sample of SMC stars as well as for many Cepheids in young clusters in the LMC. Using the FV, (V – K) calibration of Fouqué & Gieren (1997) we find preliminary evidence for a metallicity effect which makes metal poor Cepheids brighter. This is at odds with earlier results based on optical photometry and the reason is not entirely understood yet.

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. 145 - 151
Copyright
Copyright © Astronomical Society of the Pacific 2000

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