CORS Baade-Wesselink distance to the LMC NGC 1866 blue populous cluster

Details CORS Baade-Wesselink distance to the LMC NGC 1866 blue populous cluster CORS Baade-Wesselink distance to the LMC NGC 1866 blue populous cluster

2012-01-17

arxiv.org/abs/1201.3478v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

21 pages, 10 figures, Accepted for publication in the Astrophysical Journal

Scientific paper

We used Optical, Near Infrared photometry and radial velocity data for a sample of 11 Cepheids belonging to the young LMC blue populous cluster NGC 1866 to estimate their radii and distances on the basis of the CORS Baade-Wesselink method. This technique, based on an accurate calibration of the surface brightness as a function of (U-B), (V-K) colors, allows us to estimate, simultaneously, the linear radius and the angular diameter of Cepheid variables, and consequently to derive their distance. A rigorous error estimate on radius and distances was derived by using Monte Carlo simulations. Our analysis gives a distance modulus for NGC 1866 of 18.51+/-0.03 mag, which is in agreement with several independent results.

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