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VINCI/VLTI Interferometric Observations of Cepheids

Published online by Cambridge University Press:  12 April 2016

N. Nardetto
Affiliation:
Département Fresnel, UMR CNRS 6528, Observatoire de la Côted’Azur, BP 4229, 06304 Nice Cedex 4, France
P. Kervella
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile
D. Mourard
Affiliation:
Departement Fresnel, UMR CNRS 6528, Observatoire de la Côte d’Azur, BP 4229, 06304 Nice Cedex 4, France
D. Bersier
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
V. Coudé du Foresto
Affiliation:
LESIA, Observatoire de Paris-Meudon, 5, place Jules Janssen, F-92195 Meudon Cedex, France

Abstract

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We report the angular diameter measurements of seven classical Cepheids, X Sgr, η Aql, W Sgr, ζ Gem, β Dor, Y Oph, and l Car, that we have obtained with the VLT Interferometer Commissioning Instrument, installed at ESO’s VLT Interferometer. For four of these stars, η Aql, W Sgr, β Dor, and l Car, we detect the pulsational variation of their angular diameter. This enables us to compute directly their distances using a modified version of the Baade-Wesselink method. For X Sgr, ς Gem, and Y Oph, we apply a hybrid method that makes use of published estimates of their linear diameters to derive their distances.

Type
Part 9. Evolutionary and pulsation properties of variable stars
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

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