Membership determination of open cluster with parametric method: cross entropy

Autor:	Itsna Khoirul Fitriana, M. Ikbal Arifiyanto
Rok vydání:	2016
Předmět:	Physics History Proper motion Mathematical analysis Computer Science Applications Education symbols.namesake Star cluster Cross entropy Classical mechanics Gaussian function symbols Initial value problem Likelihood function Astrophysics::Galaxy Astrophysics Open cluster Parametric statistics
Zdroj:	Journal of Physics: Conference Series. 771:012031
ISSN:	1742-6596 1742-6588
DOI:	10.1088/1742-6596/771/1/012031
Popis:	Stellar open clusters are useful for studying the structure and evolution of Galaxy. Determination of the open cluster members can be viewed from their kinematics: proper motion and radial velocity. It is because the star cluster members will have a motion in the same direction, towards a convergent point. Parametric method with a double elliptic bivariate gaussian function which contains 11 parameters is used as a model of the proper motion distribution. The value of these parameters are determined numerically by cross entropy method. This method is a method of data fitting using the likelihood function whose value is maximized to get the proper parameters. This method solves the problem of determining the initial value that is often difficult to determine in other numerical methods. There are four open clusters which we have analysed: NGC 2244, ASCC 100, NGC 5168, and NGC 2169. The resulting of proper motion parameters of this method matches the parameters in the literature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::221bf3638ce1d2d5930b6e0cd785f404 https://doi.org/10.1088/1742-6596/771/1/012031 Zobrazit plný text záznamu