The stellar wind velocity function for red supergiants determined in eclipsing binaries

Physics

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Eclipsing Binary Stars, Hot Stars, Late Stars, Red Giant Stars, Stellar Winds, Supergiant Stars, Wind Velocity, Cygnus Constellation, Energy Dissipation, Velocity Distribution

Scientific paper

The potential for direct measurement of the acceleration of stellar winds from the supergiant component of Zeta Aurigae-type binary stars is discussed. The aberration angle of the interaction shock cone centered on the hot star provides a measure of the velocity of the cool star wind at the orbit of the secondary. This is confirmed by direct observations of stellar wind (P Cygni) line profile variations. This velocity is generally smaller than the final (terminal) velocity of the wind, deduced from the P Cygni line profiles. The contrast between these results and previously published supergiant wind models is discussed. The implication on the physics of energy source dissipation predicted in the theoretical models is considered.

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