TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. I. S 252 & G232.6+1.0

被引：143
|
作者：
Reid, M. J. [1 ]
Menten, K. M. [2 ]
Brunthaler, A. [2 ]
Zheng, X. W. [3 ]
Moscadelli, L. [4 ]
Xu, Y. [2 ,5 ]
机构：
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[3] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
[4] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy
[5] Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2009年 / 693卷 / 01期
基金：
美国国家科学基金会;
关键词：
astrometry; Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; masers; stars: formation; techniques: high angular resolution; SAGITTARIUS-A-ASTERISK; MILKY-WAY; PROPER MOTION; GALAXY; DISTANCE; KINEMATICS; W3(OH);
D O I：
10.1088/0004-637X/693/1/397
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We are conducting a large program with the NRAO Very Long Baseline Array (VLBA) to measure trigonometric parallaxes of massive star-forming regions across the Milky Way. Here we report measurement of the parallax and proper motion of methanol masers in S 252 and G232.6+1.0. The parallax of S 252 is 0.476 +/- 0.006 mas (2.10+(0.027)(-0.026) kpc), placing it in the Perseus spiral arm. The parallax of G232.6+1.0 is 0.596 +/- 0.035 mas (1.68+-(0.11)(0.09) kpc), placing it between the Carina-Sagittarius and Perseus arms, possibly in a Local ( Orion) spur of the Carina-Sagittarius arm. For both sources, kinematic distances are significantly greater than their parallax distances. Our parallaxes and proper motions yield full space motions accurate to approximate to 1 km s(-1). Both sources orbit the Galaxy similar to 13 km s(-1) slower than circular rotation.
引用
收藏
页码：397 / 405
页数：9
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