Helium lines in late-type dwarfs.

Details Helium lines in late-type dwarfs. Helium lines in late-type dwarfs.

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...303..155l&link_type=abstract

Astronomy and Astrophysics, v.303, p.155

Astronomy and Astrophysics

Astrophysics

14

Stars: Atmospheres, Stars: Chromospheres, Stars: Late-Type, Lines: Formation

Scientific paper

We analyse the formation of HeI lines in late-type dwarfs by statistical equilibrium (or NLTE radiative transfer) computations. Atmospheric models for a dK (ɛ Eri) and a dMe (V 1005Ori=Gl182) stars are considered. The validity of the weakly non-uniform approximation for dMe stars established in Lanzafame (???) for the lower transition region of dMe stars implies that streaming particles have virtually no role in the formation of the lines. Comparison with observations of the HeI(10830A) and HeI(5876A) lines in the dMe star, V 1005Ori, indicate that it is possible to reproduce the observed helium lines with a simple model compatible with other observational constraints. Over-ionisation by coronal EUV radiation is found to play a minor role in the formation of the triplet lines.

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