TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. II. CEP A AND NGC 7538

被引：153

作者：

Moscadelli, L. ^{[1
]}

Reid, M. J. ^{[2
]}

Menten, K. M. ^{[3
]}

Brunthaler, A. ^{[3
]}

Zheng, X. W. ^{[4
]}

Xu, Y. ^{[3
,5
]}

机构：

[1] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[4] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China

[5] Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 693卷 / 01期

关键词：

Galaxy: structure; ISM:; individual; (NGC; 7538; Cep A); masers; stars: distances; techniques: interferometric; GHZ METHANOL MASERS; CIRCUMSTELLAR DISK; NGC-7538; IRS-1; CEPHEUS-A; KINEMATICS; RESOLUTION; DISTANCE; HW2;

D O I：

10.1088/0004-637X/693/1/406

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report trigonometric parallaxes for the sources NGC 7538 and Cep A, corresponding to distances of 2.65+(0.12)(-0.11) and 0.70+(0.04)(-0.04) kpc, respectively. The distance to NGC 7538 is considerably smaller than its kinematic distance and places it in the Perseus spiral arm. The distance to Cep A is also smaller than its kinematic distance and places it in the "Local" arm or spur. Combining the distance and proper motions with observed radial velocities gives the location and full space motion of the star-forming regions. We find significant deviations from circular galactic orbits for these sources: both sources show large peculiar motions (greater than 10 km s(-1)) counter to galactic rotation and NGC 7538 has a comparable peculiar motion toward the Galactic center.

引用

页码：406 / 412

页数：7

共 17 条

[1] High-resolution study of a star-forming cluster in the Cepheus A HW2 region [J].

Comito, C. ;

Schilke, P. ;

Endesfelder, U. ;

Jimenez-Serra, I. ;

Martin-Pintado, J. .

ASTRONOMY & ASTROPHYSICS, 2007, 469 (01) :207-211

[2]

CRAMPTON D, 1978, ASTRON ASTROPHYS, V66, P1

[3]

De Buizer JM, 2005, ASTROPHYS J, V628, pL151, DOI 10.1086/432835

[4] Local stellar kinematics from Hipparcos data [J].

Dehnen, W ;

Binney, JJ .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 298 (02) :387-394

[5] THE NGC-7538 IRS-1 REGION OF STAR-FORMATION - OBSERVATIONS OF THE H66-ALPHA RECOMBINATION LINE WITH A SPATIAL-RESOLUTION OF 300-AU [J].

GAUME, RA ;

GOSS, WM ;

DICKEL, HR ;

WILSON, TL ;

JOHNSTON, KJ .

ASTROPHYSICAL JOURNAL, 1995, 438 (02) :776-783

[6] PHOTOMETRIC DISTANCES OF GALACTIC CLUSTERS [J].

JOHNSON, HL .

ASTROPHYSICAL JOURNAL, 1957, 126 (01) :121-133

[7]

KAMEYA O, 1988, PUBL ASTRON SOC JPN, V40, P413

[8] OH MASER PROPER MOTIONS IN CEPHEUS-A [J].

MIGENES, V ;

COHEN, RJ ;

BREBNER, GC .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1992, 254 (03) :501-508

[9]

Minier V, 2000, ASTRON ASTROPHYS, V362, P1093

[10]

MORENO MA, 1986, ASTRON ASTROPHYS, V161, P130

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