The velocity law and acceleration of the hydrogen and OSiN discrete components observed in P Cyg's stellar wind in 1982

Astronomy and Astrophysics – Astronomy

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Early Stars, Hydrogen, Oxygen, Stellar Winds, Visible Spectrum, Balmer Series, Nitrogen, Radial Velocity, Silicon, Stellar Envelopes, Stellar Mass Accretion

Scientific paper

In this paper, the radial-velocity variations of the discrete absorption components observed in 1982 in some Balmer, oxygen, silicon and nitrogen lines in the visible spectrum of P Cyg are used to infer the velocity law and acceleration of these components. The shell ejection model is assessed (on the basis of some previous results) as being the most suitable explanation for the existence of these features. Some shell parameters such as time of formation, radial extent, internal velocity gradient and mass are determined as functions of the shell age. The interaction between the shell and quiescent wind is considered in a very simplified way. The rate of mass accretion and the amount of the accreted mass as shell lifetime functions are determined. A lower limit to the initial shell mass is fixed.

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