Mass loss problems in CYG OB2 association: The particular case of No. 8A star

Astronomy and Astrophysics – Astrophysics

Scientific paper

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O Stars, Stellar Mass Ejection, Stellar Winds, Iue, Stellar Spectra, Terminal Velocity, Wind Velocity

Scientific paper

Analysis of IUE low resolution spectra spread over 3 yr, together with
medium dispersion optical spectra from a 152 cm telescope of Cyq OB2
N.8A star are discussed. Data show clear strong anticorrelations in the
P Cyg profiles of C IV and Si IV resonance lines, and Balmer lines in
absorption. The terminal velocity is extremely high.

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