Ruprecht 44 y la estructura espiral externa de la Galaxia

E. E. GIORGI; G. R. SOLIVELLA; R. A. VÁZQUEZ; M. A. DE LAURENTI

Tandil

Congreso; 56 Reunión Anual de la Asociación nArgentina de Astronomía; 2013

Asociación Argentina de Astronomía

We present first results of a photometric study UBVI CCD,complete with MK spectral classification and 2MASS data, focusing onthe region of the open cluster Ruprecht 44. This cluster is in an areaof very low interstellar absorption, through which it is possible examinein the optical range the spiral structure outside the solar circle. Precisedistances determination of blue stars in the field of this cluster enableanalyze, with other data recently obtained, the structure of great designin the third galactic quadrant.