Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-11
Astrophys.J. 604 (2004) L113-L116
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures, accepted for publication in ApJL
Scientific paper
10.1086/383571
Recent interferometric observations of the brightest and angularly largest classical Cepheid, L Carinae, with ESO's VLT Interferometer (VLTI) have resolved with high precision the variation of its angular diameter with phase. We compare the measured angular diameter curve to the one 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.
Bersier David
Coudé du Foresto Vincent
Fouque' Pascal
Gieren Wolfgang P.
Kervella Pierre
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