Trigonometric Parallaxes of Massive Star Forming Regions: II. Cep A & NGC 7538

Details Trigonometric Parallaxes of Massive Star Forming Regions: II. Cep A & NGC 7538 Trigonometric Parallaxes of Massive Star Forming Regions: II. Cep A & NGC 7538

2008-11-05

arxiv.org/abs/0811.0679v1

Astrophys.J.693:406-412,2009

Astronomy and Astrophysics

Astrophysics

21 pages, 8 figures; to appear in the Astrophysical Journal

Scientific paper

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

We report trigonometric parallaxes for the sources NGC 7538 and Cep A, corresponding to distances of 2.65 [+0.12/-0.11] kpc 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 (> 10 km/s) counter to Galactic rotation and NGC 7538 has a comparable peculiar motion toward the Galactic center.

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