W43A

W43A

W43A
Observation data Epoch J2000      Equinox J2000
Constellation	Aquila
Right ascension	18^h 47^m 40.97^s
Declination	-01° 44′ 55.4″
Characteristics
Spectral type	OH
Variable type	Asymptotic giant branch
Astrometry
Radial velocity (Rv)	13.8 km/s
Distance	8500 ly
Details
Other designations
IRAS 18450-0148, MSX6C G030.9441+00.0350, W 43A, TVH89 353, MSX5C G030.9444+00.0347, OH 31.0 +0.0, SVM2001b 223.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

W43A or IRAS 18450-0148 is a late-type star with an envelope of OH/IR type with a magnetically collimated jet (a protoplanetary nebula). The star is in the early stages of becoming a planetary nebula, a process that will take several thousand years.

References

• Vlemmings, Wouter H.T.; Diamond, Philip J.; Imai, Hirosh (2006). "A magnetically collimated jet from an evolved star". Nature 440 (7080): 58–60. Bibcode:2006Natur.440..58V. doi:10.1038/nature04466. PMID 16511488.
• Imai, Hiroshi; Obara, Kumiko; Diamond, Philip J.; Omodaka, Toshihiro; et al. (2002). "A collimated jet of molecular gas from a star on the asymptotic giant branch". Nature 417 (6891): 829–831. Bibcode:2002Natur.417..829I. doi:10.1038/nature00788. PMID 12075345.
• Imai, Hiroshi; Nakashima, Jun-ichi; Diamond, Philip J.; Miyazaki, Atsushi; et al. (2005). "A Biconically Expanding Flow in W43A Traced by SiO Maser Emission". The Astrophysical Journal 622 (2): L125–L128. Bibcode:2005ApJ...622L.125I. doi:10.1086/429820.
• Deacon, R. M.; Chapman, J. M.; Green, A. J.; Sevenster, M. N. (2007). "H2O Maser Observations of Candidate Post-AGB Stars and Discovery of Three High-Velocity Water Sources". The Astrophysical Journal 658 (2): 1096–1113. arXiv:astro-ph/0702086. Bibcode:2007ApJ...658.1096D. doi:10.1086/511383.
• M. Szymczak & E. Gérard (2004). "Polarimetric observations of OH masers in proto-planetary nebulae". Astronomy & Astrophysics 423: 209–219. arXiv:astro-ph/0405316. Bibcode:2004A&A...423..209S. doi:10.1051/0004-6361:20040461.