On time-dependent ionization in stellar chromospheres

Details On time-dependent ionization in stellar chromospheres On time-dependent ionization in stellar chromospheres

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..229k&link_type=abstract

Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 229-235.

Astronomy and Astrophysics

Astrophysics

18

Chromosphere, Gas Ionization, Interstellar Gas, Stellar Atmospheres, Atmospheric Composition, Atmospheric Models, Conservation Equations, Dynamic Response, Electron Density Profiles, Hydrogen, Statistical Analysis, Stellar Mass, Time Dependence

Scientific paper

This investigation deals with the question of whether ionization equilibrium in stellar chromospheres is adjusted quickly or slowly compared with dynamical time scales. It is shown that the adjustment time for ionization of hydrogen may be of the order of 10 to the 2nd s (middle solar chromosphere) to 10 to the 3rd s (upper solar chromosphere). This has consequences on the structure of chromospheres; for instance, stationary flows - which are limited to subsonic speed in plane-parallel geometry - drastically change the electron density in comparison to the static case. Unless confirmed by consistent dynamical calculations, chromospheric models based on the assumption of statistical steady state should be taken as rough estimates of chromospheric structure.

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