Other
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.318..561m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 318, Issue 2, pp. 561-572.
Other
10
Circumstellar Matter, Stars: Individual: P Cygni, Stars: Variables: Other
Scientific paper
Further optical observations have been made with the Manchester Occulting Mask Imager and Manchester Echelle Spectrometer of the inner and outer shells of P Cygni, and of the 7-arcmin long giant lobe projecting from this luminous blue variable star. An image in the light of the fluorescently excited [Niii] 7378-Å line has revealed the knottiness of the inner shell. Well defined `velocity ellipses' for the position/velocity arrays across the outer shell indicate that its expansion velocity is 160kms-1 which is somewhat lower than the previously reported value. The kinematical behaviour of the giant lobe, both in the vicinity of P Cygni, and further away, emphasizes its strange nature, although close association with P Cygni is again suggested by these new observations. One possibility is that this lobe is a `trail' of collimated ejected material. The observations are compared with a 60-μm IRAS high-resolution map of the region. A variety of possible explanations of the observed phenomena are explored, e.g. radio knots in the outer stellar wind either coalesce or expand to become the [Niii]7378-Å emitting knots in the inner shell; that a mass-loaded wind overunning slower moving clumps explains the kinematics of the inner shell; that the one-sided giant lobe could be a `trail' of ejected material from P Cygni funnelled through the outer shell.
Bryce Myfanwy
Lopez Jose Alberto
Meaburn John
Noriega-Crespo Alberto
O'Connor Anthony J.
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