Application of Vector Spherical Harmonics for Kinematic Analysis of Stars from Zonal Catalogues

V.V. Vityazev, A.S. Tsvetkov

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

7 Цитирования (Scopus)

Аннотация

We solve the problem on a kinematic analysis of the three-dimensional velocity field of stars from zonal catalogues, i.e., catalogues in which the stars are presented at all right ascensions in some declination zones. We have constructed a system of vector spherical harmonics with the properties of completeness and orthogonality for a chosen declination zone. We suggest a method that allows the Ogorodnikov–Milne model parameters in the Galactic coordinate system to be estimated by analyzing the proper motions and radial velocities of stars in the equatorial coordinate system. The vector spherical harmonics are shown to have the following advantages over the standard approach based on a direct leastsquares estimation of the parameters for a specific model. First, in contrast to the standard approach, the new method can reveal all systematic components of the velocity field irrespective of a particular model. Second, it allows one to get rid of the correlation between the sought-for parameters, which presents a
Язык оригиналане определен
Страницы (с-по)874-887
ЖурналAstronomy Letters
Том37
Номер выпуска12
DOI
СостояниеОпубликовано - 2011

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