Spicular downflows and the transition to high mass-loss rates in G and K giants

Details Spicular downflows and the transition to high mass-loss rates in G and K giants Spicular downflows and the transition to high mass-loss rates in G and K giants

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..229w&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 229-234.

Astronomy and Astrophysics

Astrophysics

5

G Stars, Giant Stars, K Stars, Late Stars, Stellar Coronas, Stellar Mass Ejection, Hertzsprung-Russell Diagram, Stellar Evolution, Stellar Temperature, Stellar Winds

Scientific paper

The mass-loss rates and coronal base pressures of stars that have evolved up to and beyond the so-called high mass-loss rate transition locus have been examined, using an energy-balance model in which the coronal energy losses due to downflowing spicular material are included. The minimum flux assumption of Hearn is used to evaluate the jump in mass-loss rate expected when the sonic point of the stellar wind reaches the coronal base. An order-of-magnitude increase in mass-loss rate is predicted. In addition, this jump in mass-loss rate is estimated, using a temperature-height profile for a transition region dominated by spicular downflows to estimate the amount of downflowing material. Both methods give similar results, leading to the conclusion that as a star evolves across the transition locus, an order-of-magnitude increase in stellar mass-loss rate is to be expected.

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