CORS BAADE-WESSELINK DISTANCE TO THE LMC NGC 1866 BLUE POPULOUS CLUSTER
- INAF Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli (Italy)
- INAF-Osservatorio Astronomico di Collurania, Via M. Maggini, 64100 Teramo (Italy)
- Dipartimento di Astronomia, Univ. Bologna, Via Ranzani 1, Bologna (Italy)
- Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council, Victoria, BC V9E 2E7 (Canada)
- Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam (Germany)
- Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena (Chile)
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 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 radii 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.
- OSTI ID:
- 22016151
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 748; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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