| Autor: |
Osamu Kameya, Tetsuo Sasao, Masanori Nishio, Y. Asaki, Junichi Nakajima, Teruhiko Watanabe, Hiroshi Imai, Toshihiro Omodaka |
| Rok vydání: |
2002 |
| Předmět: |
|
| Zdroj: |
Symposium - International Astronomical Union. 206:88-91 |
| ISSN: |
0074-1809 |
| Popis: |
We describe the proper motion measurements of water masers in the massive-star forming region W 51A and the analysis of the 3-D kinematics in three maser clusters of W 51A. We found a systematic expanding motion in one of the clusters named W 51 North, while no systematic motion was detected in other two clusters named W 51 Main and South. The 3-D motions of the clusters relative to the position reference feature in W 51 North indicate a separating motion between the W 51 North and the W 51 Main/South clusters. We estimated the distance to W 51 North as to be 6.7±2.1 kpc on basis of the statistical parallax and the model fitting methods. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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