The detection of a circumstellar shell around P Cygni by direct CCD imaging

Details The detection of a circumstellar shell around P Cygni by direct CCD imaging The detection of a circumstellar shell around P Cygni by direct CCD imaging

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..103l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 103-106.

Astronomy and Astrophysics

Astrophysics

13

Blue Stars, Stellar Envelopes, Stellar Mass Ejection, Variable Stars, Calibrating, Charge Coupled Devices, H Alpha Line, Nitrogen, Stellar Winds

Scientific paper

Narrow-band direct CCD images of the luminous blue variable P Cygni in H-alpha, N II forbidden line, and continuum light were obtained. By comparing the light distribution of P Cyg with the seeing disk of 55 Cyg, it was found to be more extended than a point-spread function in H-alpha and N II forbidden line. The intensity profiles in H-alpha and N II forbidden line can be interpreted in terms of the strong stellar wind. The derived H-alpha intensity distribution is in quantitative agreement with a model for the stellar wind, where matter is ejected in dense shells. The velocity and the density of the shells appear to have been constant, at least over the past 300 years.

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