Further variability of the compact radio nebula of P Cygni

Details Further variability of the compact radio nebula of P Cygni Further variability of the compact radio nebula of P Cygni

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.333..715e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 333, Issue 3, pp. 715-720.

Astronomy and Astrophysics

Astronomy

6

Stars: Imaging, Stars: Individual: P Cygni, Supergiants, Radio Continuum: Stars, Stars: Imaging, Stars: Individual: P Cygni, Supergiants, Radio Continuum: Stars

Scientific paper

Skinner et al. presented two high-resolution 6-cm (5GHz) images of the B-supergiant star P Cygni. These show the observed morphology and flux densities to have changed over the intervening month. Following on from this, we present a series of seven high-resolution 6-cm images (including re-reductions of the two from Skinner et al.). These confirm that radio emission from the inner 400mas of the wind is inhomogeneous, consisting usually of several separated bright spots, and that the total and peak flux densities and the observed morphology vary over all time-scales sampled. We suggest that recombination in cooling clumps of gas which will decrease the radio emission, followed by the appearance of other ionized clumps, could explain such rapid changes, but detailed models must await further observations.

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