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arXiv:astro-ph/0402244 (astro-ph)
[Submitted on 11 Feb 2004]

Title:The angular size of the Cepheid L Car: a comparison of the interferometric and surface brightness techniques

Authors:P. Kervella, P. Fouque, J. Storm, W. P. Gieren, D. Bersier, D. Mourard, N. Nardetto, V. Coude du Foresto
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Abstract: 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.
Comments: 7 pages, 3 figures, accepted for publication in ApJL
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0402244
  (or arXiv:astro-ph/0402244v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0402244
Journal reference: Astrophys.J. 604 (2004) L113-L116
Related DOI: https://doi.org/10.1086/383571

Submission history

From: Pierre Kervella [view email]
[v1] Wed, 11 Feb 2004 01:00:19 UTC (51 KB)
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