The stellar winds of K and early M giants: Evidence for a subclass with abnormally high expansion velocities

Astronomy and Astrophysics – Astrophysics

Scientific paper

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K Stars, Red Giant Stars, Stellar Atmospheres, Stellar Coronas, Stellar Mass Ejection, Stellar Winds, Iue, Stellar Evolution, Stellar Spectra

Scientific paper

The preliminary results of an investigation of the morphology of the Mg II resonance lines in K and early M giants are presented. Winds of high (≥50 km/sec) velocity are quite common in K giants, particularly of MK Class IIIa, but rare in M giants. In one confirmed case (γ Phe; K5 III) and another probable case (σ Pup; K5 III), the simultaneous presence of C IV emission and a cool, high-velocity wind imply the existence in normal giants of the 'hybrid-atmosphere' phenomenon first recognized in G and K bright giants and supergiants.

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