Stochastic shock waves as a candidate mechanism for the formation of the He I 10830-A line in cool giant stars

Details Stochastic shock waves as a candidate mechanism for the formation of the He I 10830-A line in cool giant stars Stochastic shock waves as a candidate mechanism for the formation of the He I 10830-A line in cool giant stars

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353l..39c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 353, April 20, 1990, p. L39-L43.

Astronomy and Astrophysics

Astrophysics

13

Cool Stars, Giant Stars, Late Stars, Line Shape, Shock Waves, Chromosphere, Stellar Atmospheres, Stellar Temperature, Stochastic Processes

Scientific paper

The question of whether strong shocks produced in time-dependent stochastic wave models can explain the formation of the He I 10830-A line in cool giant stars is examined. The research is based on the ab initio chromosphere model for Arcturus by Cuntz (1987), showing that a stochastic distribution of wave periods leads to overtaking and merging of shocks, which occasionally produce very strong shocks with temperatures larger than 40,000 K in the postshock regions. These temperatures can easily produce a significant population in the 2s 3S state by electron collisional excitation. The 10830-A line occurs in absorption when the densities in the shocks exceed 10 million/cu cm.

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