Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-13
Astronomy and Astrophysics
Astrophysics
Accepted by A&A letters, 4 pages, 3 figures
Scientific paper
10.1051/0004-6361:200400129
We present empirically determined ionization conditions for the winds of 106 luminous B0 to B5 stars observed by IUE. The UV wind lines are modelled to extract products of mass-loss rates (Mdot) times ionization fractions (Mdot q_i(w), where w = v/v_infty) for N V, C IV, Si IV, Si III, Al III and C II. We describe the general behaviour of the Mdot q_i(w) and their ratios, demonstrating that the wind ionization increases with distance from the star, contrary to recent findings for O star winds. Using empirical mass-loss rates (from H alpha observations) and model prescriptions, we derive mean q_i(w) values integrated over the wind,
Massa Derck
Prinja Raman K.
Searle Samantha C.
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