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VINCI/VLTI Interferometric Observations of Cepheids

Published online by Cambridge University Press:  12 April 2016

N. Nardetto ,
P. Kervella ,
D. Mourard ,
D. Bersier  and
V. Coudé du Foresto
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
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 520 - 524
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

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