Stellar wind variation in CYG OB2 association: The case of No. 8A star

Details Stellar wind variation in CYG OB2 association: The case of No. 8A star Stellar wind variation in CYG OB2 association: The case of No. 8A star

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.155g&link_type=abstract

In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 155-156 (SEE N89

Astronomy and Astrophysics

Astronomy

B Stars, Cygnus Constellation, Iue, O Stars, Periodic Variations, Spaceborne Astronomy, Stellar Winds, Ultraviolet Astronomy, Ultraviolet Spectra, Balmer Series, Resonance Lines

Scientific paper

Several IUE low resolution spectra of the star 8A of Cyg OB2 association, spread over 3 yr, together with medium dispersion spectra, show clear strong variations in the P Cyg profiles of C IV and Si IV resonance lines, and Balmer lines. Anticorrelation between C IV and Si IV line intensities is evident, showing that, probably, the wind is not isothermal, or a variation in the density is responsible of the variation in the ionization degree. The analysis of the variations of the velocities shows that the wind is subject to acceleration processes. The physical parameters of stellar wind are quantified.

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