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A&A manuscript no. (will be inserted by hand later)

Summary: A&A manuscript no.
(will be inserted by hand later)
Your thesaurus codes are:
08 (08.01.3; 08.03.4; 08.12.1; 02.18.7; 02.12.3)
The upper chromosphere and lower transition region of
dMe stars.
Atmospheric models, ambipolar diffusion and streaming particles
A. C. Lanzafame
Armagh Observatory, Armagh BT61 9DG, N. Ireland, UK
Received xxx; accepted xxx
Abstract. Models for the upper chromosphere and the lower transition region of dM0e­dM2e stars are presented.
The modelling procedure is based on a modification of the semi­empirical approach useful for evaluating the effects
of prescribed transport processes to the energy balance. The statistical equilibrium equations include terms due to
hydrogen ambipolar diffusion in order to investigate its importance in the ionisation and energy balance. Several
spectroscopic diagnostics have been used such as the hydrogen Hff and Lyff lines, Si II resonance multiplets near
1814 š A and 1264 š A and the Mg II h & k lines. The analysis of the Hff profile in the dM1e star V1005 Ori (=Gl 182)


Source: Armagh Observatory


Collections: Physics