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- Title
- Water maser motions in W3(OH) and a determination of its distance
- Author(s)
- Hachisuka, Kazuya; Brunthaler, Andreas; Menten, Karl M.; Reid, M. Jamila; Imai, Hiroshi; Hagiwara, Yoshiaki; Miyoshi, Makoto; Horiuchi, Shinji; Sasao, Tetsuo
- Abstract
- We report phase-referencing VLBA observations of H2O masers near the star-forming region W3(OH) to measure their parallax and absolute proper motions. The measured annual parallax is 0.489 ±0.017 mas (2.04 ±0.07 kpc), where the error is dominated by a systematic atmospheric contribution. This distance is consistent with photometric distances from previous observations and with the distance determined from CH3OH maser astrometry presented in a related paper. We also find that the source driving the H2O outflow, the 'TW-object,' moves with a three-dimensional velocity of >7 km s-1 relative to the ultracompact H II region W3(OH).
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Source
- Astrophysical Journal, Vol. 645, no. 1 (2006), p. 337-344
- Publication year
- 2006
- Keyword(s)
- Astrometry; Masers; Star distances; Star formation; Stars; W3(OH); Stellar dynamics
- Publisher
- University of Chicago Press
- ISSN
- 0004-637X
- Publisher URL
- http://dx.doi.org/10.1086/502962
- Copyright
- Copyright © 2006 The American Astronomical Society. Reproduced in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed
