Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..519a&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 519-525.
Astronomy and Astrophysics
Astronomy
14
Interstellar Extinction, Oao 3, Stellar Spectrophotometry, Supergiant Stars, Ultraviolet Astronomy, Cygnus Constellation, Novae, Photosphere, Stellar Winds
Scientific paper
Copernicus ultraviolet scans of the peculiar mass-losing star P Cyg are described. From the L-alpha profile and diffuse band strengths reported in the literature, a value of interstellar reddening E(B V) of approximately 0.35 mag is derived, leading to the conclusion that the star is intrinsically reddened. This value for the color excess leads to an estimated distance for P Cyg of 0.6-1.8 kpc, on the basis of which a revised visual absolute magnitude of -7.6 to -5.2 is obtained. The wind from P Cyg is quite unlike that for other early B supergiants, displaying a low terminal velocity and low ionization. This difference is connected with the great extension of its photosphere and with the fact that the acceleration of the flow begins below the photosphere. It is suggested that the wind in P Cyg results from dynamical instabilities quite distinct from the mechanism which initiates the winds in other OB stars.
Ambartsumian V. A.
Mirzoian L.
Snow P. Jr. Th.
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