5 papers
Radio emission from WR140
S. M. Dougherty, A. J. Beasley, M. J. Claussen +2
Milliarcsecond resolution Very Long Baseline Array (VLBA) observations of the archetype WR+O star colliding-wind binary (CWB) system WR140 have been obtained at 23 epochs between o…
A Systematic Spectroscopic X-Ray Study of Stellar Coronae with XMM-Newton: Early Results
M. Guedel, M. Audard, K. W. Smith +10
We have been conducting a comprehensive survey of stellar coronae with the XMM-Newton Reflection Grating Spectrometers during the commissioning, calibration, verification, and guar…
A High-Frequency and Multi-Epoch VLBI Study of 3C 273
T. P. Krichbaum, D. A. Graham, A. Witzel +5
We show results from a 7 year VLBI monitoring programme of 3C273 at millimeter wavelengths. We find evidence for component acceleration, motion or rotation of fluid dynamical patte…
VLBI Astrometry of the Stellar Image of U Herculis, Amplified by the 1667 OH Maser
H. J. van Langevelde, W. Vlemmings, P. J. Diamond +2
The OH 1667 MHz maser in the circumstellar shell around the Mira variable U Herculis has been observed with the NRAO Very Long Baseline Array (VLBA) at 6 epochs, spread over 4 year…
VLBI observations of the 6.7 and 12.2 GHz methanol masers associated with NGC 6334F
S. P. Ellingsen, R. P. Norris, P. J. Diamond +12
We present milliarcsecond resolution images of the 6.7 and 12.2 GHz methanol maser emission associated with the well-known star formation region NGC 6334F. The images agree well wi…