Exploració per autor "Alcobé López, Santiago"
Ara es mostren els items 3-8 de 8
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Mixture parameters of a trivariate normal superposition from sample cumulants: application to the local stellar velocity distribution
Cubarsí Morera, Rafael; Alcobé López, Santiago (Carles Casacuberta, Josep Maria Font, Santiago Zarzuela, 2000)
Text en actes de congrés
Accés obertThe velocity distribution of nearby stars can be studied as a mixture of two main population components. In order to determine the mixing proportions and the population parameters a combined geometric-statistical method ... -
Non-informative filtering of the local stellar velocity distribution to obtain two nearly-pure statistical populations
Cubarsí Morera, Rafael; Alcobé López, Santiago; Catala-Poch, M.A. (UNIVERSITAT MANCHESTER, 2000)
Comunicació de congrés
Accés obertThe determination of stellar population constants from the statistics of a global sample is extremely sensitive to the noise introduced by a few non-typical stars. The local velocity distribution can be better determined ... -
Optimal seggregation of a two-component sample based on maximim population entropy: an application to astronomy
Alcobé López, Santiago; Catala-Poch, M.A.; Cubarsí Morera, Rafael (Birkhäuser Verlag, 2000)
Text en actes de congrés
Accés obertDetermination of stellar population parameters from statistics of global samples is extremely sensitive to the noise introduced by few non-typical stars. In order to obtain a nearly-pure two-population mixture a subsample ... -
Partition entropy and chi-squared error: the improved MEMPHIS algorithm - Part I
Cubarsí Morera, Rafael; Alcobé López, Santiago (2009-07)
Report de recerca
Accés obertThe entropy of the population partition is studied as a function of the sampling parameter, so that within a particular interval of its graph, the plateau region, it is possible to get a stable estimation of the mixture ... -
Programas del algoritmo de clasificacion de poblaciones normales trivariantes a partir de la entropia de mezcla
Cubarsí Morera, Rafael; Alcobé López, Santiago (2001-01)
Report de recerca
Accés obertThe complete FORTRAN codified programs of the segregation algorithm described in Alcobé (2001) are described. The classification algorithm is applied to study the trivariate velocity distribution of stars from the star ... -
Three kinematical methods to identify local galactic structures
Cubarsí Morera, Rafael; Alcobé López, Santiago; Vidojevic, S.; Ninkovic, S. (2010-05)
Comunicació de congrés
Accés obertMethod one: by combining a sampling parameter related to an isolating integral of the stellar motion, an optimisation of the mixture approach, and a maximisation of the partition entropy for the constituent populations ...