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Title:
The Angular Size of the Cepheid l Carinae: A Comparison of the Interferometric and Surface Brightness Techniques
Authors:
Kervella, Pierre; Fouqué, Pascal; Storm, Jesper; Gieren, Wolfgang P.; Bersier, David; Mourard, Denis; Nardetto, Nicolas; du Coudé Foresto, Vincent
Affiliation:
AA(European Southern Observatory, Casilla 19001, Santiago 19, Chile; LESIA, Observatoire de Paris-Meudon, 5 place Jules Janssen, F-92195 Meudon Cedex, France ), AB(European Southern Observatory, Casilla 19001, Santiago 19, Chile; Observatoire Midi-Pyrénées, UMR 5572, 14 avenue Edouard Belin, F-31400 Toulouse, France ), AC(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany ), AD(Universidad de Concepción, Departamento de Física, Casilla 160-C, Concepción, Chile ), AE(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 ), AF(GEMINI, UMR 6203, Observatoire de la Côte d'Azur, Avenue Copernic, F-06130 Grasse, France ), AG(GEMINI, UMR 6203, Observatoire de la Côte d'Azur, Avenue Copernic, F-06130 Grasse, France ), AH(LESIA, Observatoire de Paris-Meudon, 5 place Jules Janssen, F-92195 Meudon Cedex, France )
Publication:
The Astrophysical Journal, Volume 604, Issue 2, pp. L113-L116. (ApJL Homepage)
Publication Date:
04/2004
Origin:
UCP
Astronomy Keywords:
Stars: Variables: Cepheids, Cosmology: Distance Scale, Stars: Distances, Stars: Fundamental Parameters, Stars: Oscillations, Techniques: Interferometric
DOI:
10.1086/383571
Bibliographic Code:
2004ApJ...604L.113K

Abstract

Recent interferometric observations of the brightest and angularly largest classical Cepheid, l Carinae, with ESO's Very Large Telescope Interferometer have resolved with high precision the variation of its angular diameter with phase. We compare the measured angular diameter curve to the one that we derive by an application of the Baade-Wesselink-type infrared surface brightness technique and find a near-perfect agreement between the two curves. The mean angular diameters of l Car from the two techniques agree very well within their total error bars (1.5%), as do the derived distances (4%). This result is an indication that the calibration of the surface brightness relations used in the distance determination of far-away Cepheids is not affected by large biases.
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