Proper motions of water vapour masers and bipolar outflow from NML Cygni
نویسندگان
چکیده
منابع مشابه
Proper motions of water vapour masers and bipolarout ow from NML
MERLIN observations of the 22-GHz H 2 O masers in the circumstellar envelope of the supergiant NML Cyg show an irregular ring of emission 200 mas across, plus a pair of outlying features to the NW and SE nearly 600 mas apart. Comparison with maps at previous epochs reveals proper motions of these outlying features, of 1:90:4 mas yr ?1. This corresponds to a transverse velocity of 194 km s ?1 at...
متن کاملNonuniform Dust Outflow Observed around Infrared Object Nml Cygni
Measurements by the University of California Berkeley Infrared Spatial Interferometer at 11.15 km have yielded strong evidence for multiple dust shells and/or signiÐcant asymmetric dust emission around NML Cyg. New observations reported also include multiple 8È13 km spectra taken from 1994È1995 and N-band (10.2 km) photometry from 1980È1992. These and past measurements are analyzed and Ðtted to...
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We present VLBA observations of water maser emission associated with the star forming region IRAS 21391+5802, which is embedded in a bright rimmed cometary globule in IC1396. The angular resolution of the maps is ∼ 0.8 mas, corresponding to a spatial resolution of ∼0.6 AU, at an estimated distance of 750 pc. Proper motions are derived for 10 maser features identified consistently over three epo...
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We report new observations of the far infrared and submillimeter water vapor emission of NML Cygnus based on data gathered with the Infrared Space Observatory and the Submillimeter Wave Astronomy Satellite. We compare the emission from NML Cyg to that previously published for VY CMa and W Hya in an attempt to establish the validity of recently proposed models for the outflow from evolved stars....
متن کاملDiscovery of water vapour in the carbon star V Cygni from observations with Herschel/HIFI*
D. A. Neufeld1, E. González-Alfonso2, G. Melnick3, M. Pułecka4, M. Schmidt4, R. Szczerba4, V. Bujarrabal5, J. Alcolea6, J. Cernicharo7, L. Decin8,9, C. Dominik9,15, K. Justtanont10, A. de Koter9,16, A. P. Marston11, K. Menten12, H. Olofsson10,13, P. Planesas5,14, F. L. Schöier10, D. Teyssier11, L. B. F. M. Waters9,8, K. Edwards17, C. McCoey17, R. Shipman18, W. Jellema18, T. de Graauw19, V. Osse...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1996
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/282.2.665