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Browsing by Author "Richards, A.M.S."
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The compact circumstellar material around OH 231.8+4.2
Matsuura, M.; Chesneau, O.; Zijlstra, A.A.; Jaffe, W.; Waters, L.B.F.M.; Yates, J.A.; Lagadec, E.; Gledhill, T.; Etoka, S.; Richards, A.M.S. (2006) -
The disappearance of the 1667-MHz OH maser in IRAS 17436+5003 (HD 161796)
Bains, I.; Yates, J.A.; Gledhill, T.; Richards, A.M.S. (2003)We report the diminution of the 1667-MHz OH maser in the post-asymptotic giant branch star IRAS 17436+5003, by a factor of ≳17 over a period of ≲12 yr, from observations with MERLIN. This circumstellar maser was detected ... -
Is the Outflow from RT Vir Bipolar or Rotating
Yates, J.A.; Richards, A.M.S.; Gledhill, T.; Bains, I. (Astronomical Society of the Pacific, 2000)We present high angular resolution observations of H2O maser proper motions in the circumstellar envelope of the semi-regular variable RT Vir. The MERLIN observations, at 12-mas angular resolution, were used to map H2O ... -
The Magnetic Field and Maser Structure in the Proto-Planetary Nebula IRAS 20406+2953
Bains, I.; Gledhill, T.; Richards, A.M.S.; Yates, J.A. (Astronomical Society of the Pacific, 2004)Our understanding of the morphological evolutionary path from AGB star to planetary nebula is still unclear; broadly speaking, we are faced with shaping models that primarily detail varying forms of binary evolution, and ... -
MERLIN polarimetry of the OH masers in IRAS 20406+2953
Bains, I.; Richards, A.M.S.; Gledhill, T.; Yates, J.A. (2004)We present the third in a series of results from our programme of the detection and measurement of magnetic fields in protoplanetary nebulae (PPN), using full-polarization MERLIN observations of OH masers. These are the ... -
MERLIN polarimetry of the OH masers in OH17.7-2.0
Bains, I.; Gledhill, T.; Yates, J.A.; Richards, A.M.S. (2003)We report the first results of our study of magnetic fields in protoplanetary nebula candidates. Such fields may have important implications for the currently accepted Generalized Interacting Stellar Winds path to planetary ... -
Near infrared coronagraph images of IRC +10216 - Faint structures at 1-5 from the central star
Murakawa, K.; Tamura, M.; Suto, H.; Itoh, Y.; Hayashi, S.; Oasa, Y.; Nakajima, Y.; Kaifu, N.; Yates, J.A.; Gledhill, T.; Richards, A.M.S.; Hough, J.; Kosugi, G.; Usuda, T. (2002) -
OH maser mapping of the evolved star HD 179821: evidence for interacting outflows
Gledhill, T.; Yates, J.A.; Richards, A.M.S. (2001)The evolved star HD 179821 continues to be the subject of much debate as to whether it is a nearby post-asymptotic giant branch (post-AGB) star or a distant high initial mass post-red supergiant. We have mapped the OH maser ... -
OH Megamasers, starburst and AGN activity in Markarian 231
Richards, A.M.S.; Knapen, J.; Yates, J.A.; Cohen, R.J.; Collett, J.; Wright, M.M.; Gray, M.D.; Field, D. (2005-12) -
Resolved OH megamaser emission in the nuclear region of the ultraluminous infrared galaxy Markarian 273
Yates, J.A.; Richards, A.M.S.; Wright, M.M.; Collett, J.; Gray, M.D.; Field, D.; Cohen, R.J. (2000)We present high angular resolution MERLIN observations of the 18-cm OH maser and continuum emission associated with the active core of the ultraluminous infrared galaxy Markarian 273. The continuum emission comes from three ...