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Abstract
The incidence of accidental errors of proper motion data in the solution of the stellar membership to open clusters is analysed. A mixed bivatiate normal model with correlation coefficient is used. The parameters of this mixture are determined by the maximum likelihood method solving a fourteen non linear equation system with constraints on the correlation, the percentage o field stars and the standard deviations. The method is applied to sol ve the membership problem in the open cluster NGC2287 and a comparison with those membership results from proper motions without' the consideration of accidental errors is made.
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References
Brieva, E. & A. Uribe. 1985. Una aplicación del método de máxima verosimilitud en astronomía galáctica. Revista Colombiana de Estadística 12: 1-21.
Brieva, E. & A. Uribe. 1990. Sobre la determinación de la pertenencia de estrellas a cúmulos abiertos a partir de movimientos propios. Rev. Acad. Colomb. Cienc. 17 (66): 461-466.
Brieva, E. & A. Uribe. 1994. Pertenencia de estrellas en la región del cúmulo abierto NGC6530. Rev. Acad. Colomb. Cienc. 19 (72): 7-17.
Cabrera, J. & E. J. Affaro. 1985. Analysis of relative proper motion: an improved method to assign membership probabilities in open clusters. Astron. Astrophys. 150: 298-301.
Cabrera, J. & E. J. Affaro. 1990. A non-parametric approach to the membership problem in open clusters. Astron. Astrophys. 235: 94-102.
Cox, A. N. 1954. Astrophys. J.
Cudworth, K. 1984. Comunicación personal.
De Graeve, E. 1979. Astrometric criteria for selecting "Physical Members" of open clusters with low astrometric precision. Application To NGC559. Vatican Observatory Publications 1(16): 283-306.
Hancock, H. 1917. Theory of maxima and minima, Dover, New York.
Ianna, P. A., Adler, D. S. & E. F. Faudree. 1987. Membership in the open cluster NGC2287. Astron. J. 92: 347-358.
Lattanzi, M. G., Massone, G. & U. Munari. 1991. Memberships and CM diagrams of young open clusters, I. NGC225. Astron. J. 102: 177-199.
Missana, M. & N. Missana. 1990. A new method for deriving stellar membership with an application to the open cluster NGC 1664. Astron. J. 100: 1850-1858.
Missana, M. & N. Missana. 1994. Amendment of our method for deriving stellar membership in open clusters. Comunicación personal.
Sanders, W. L. 1971. An improved method for computing membership probabilities in open clusters. Astron. Astrophys. 14: 226-232.
Slovak, M. H. 1977. Maximum-likelihood method for determination of membership in open clusters. Astron. J. 82: 818-823.
Uribe, A. & E. Brieva. 1994. The problem of stellar membership in open clusters. Astrophysics and Space Science 214: 171-183.
Vasilevskis, S., Klemola, A. & G. Preston. 1958. Relative proper motions of stars in the region of the open cluster NGC6633. Astron. J. 63: 387-395.
Zhao, J. L., Tian, K., Su, Z. & M. Yin. 1982. Discussion on the maximum likelihood method for determination of membership in open clusters. Chin. Astron. Astrophys. 6: 293-298.
Zhao, J. L. & Y. P. He. 1990. An improved method for membership determination of stellar clusters with proper motions with different accuracies. Astron. Astrophys. 237: 54-60.
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