The OSACA database and a kinematic analysis of stars in the solar neighborhood

被引:35
作者
Bobylev, V. V. [1 ]
Goncharov, G. A. [1 ]
Bajkova, A. T. [1 ]
机构
[1] Russian Acad Sci, Cent Pulkovo Astron Observ, St Petersburg 196140, Russia
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1134/S1063772906090071
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We transformed radial velocities compiled from more than 1400 published sources, including the Geneva-Copenhagen survey of the solar neighborhood (CORAVEL-CfA), into a uniform system based on the radial velocities of 854 standard stars in our list. This enabled us to calculate the average weighted radial velocities for more than 25000 HIPPARCOS stars located in the local Galactic spiral arm (Orion arm) with a median error of +/- 1 km/s. We use these radial velocities together with the stars' coordinates, parallaxes, and proper motions to determine their Galactic coordinates and space velocities. These quantities, along with other parameters of the stars, are available from the continuously updated Orion Spiral Arm Catalogue (OSACA) and the associated database. We perform a kinematic analysis of the stars by applying an Ogorodnikov-Milne model to the OSACA data. The kinematics of the nearest single and multiple main-sequence stars differ substantially. We used distant ((r) over bar approximate to 0.2 kpc) stars of mixed spectral composition to estimate the angular velocity of the Galactic rotation, omega(o) = -25.7 +/- 1.2 km s(-1) kpc(-1), and the vertex deviation, l = 13 degrees +/- 2 degrees, and detected a negative K effect. This negative K effect is most conspicuous in the motion of A0-A5 giants and is equal to K = -13.1 +/- 2.0 km s(-1) kpc(-1).
引用
收藏
页码:733 / 747
页数:15
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