Models for M-Dwarf Basal Atmospheres

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We performed NLTE-radiation transfer calculations in an attempt to reproduce M dwarf spectra with zero H alpha and low Ca II emission lines. We found that zero H alpha can be produced by a range of models and that the Ca II flux is dramatically affected by the temperature minimum value. We show that it is possible to reproduce the observations with low pressure transition region and low temperature minimum models. Such models provide important constraints for modelling acoustic heating mechanisms.

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