Advertisement

Chromospheric Modelling of Active Regions on AU Mic

  • Eric R. Houdebine
Conference paper

Abstract

We present the results of a successful attempt in modelling H α and H β high resolution profiles of a dMe star. The object of our modelling is the chromosphere of active regions on the well known BY Draconis type star AU Mic (dM2.5e). We show that a very high transition region column density and a steep temperature gradient in the chromosphere are required to reproduce with accuracy the emission profiles of this very active star. The chromospheric structure is similar to those obtained when modelling solar flares, implying a very large and continuous chromospheric heating rate.

Keywords

Solar Flare Active Star Steep Temperature Gradient Balmer Series European Southern Observatory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Avrett, E.H., Machado, M.E., Kurucz, R.L.: 1986, NSO/SMM Symposium on The Lower Atmosphere of Solar Flares, Ed. D.F. Neidig, 216.Google Scholar
  2. Cram, L.E. and Mullan D.J.: Astrophys. J., 234, 576 (1979)Google Scholar
  3. Doyle, J.G., Panagi, P.M. and Byrne, P.B.: 1990, Astron. Astrophys., 228, 443.ADSGoogle Scholar
  4. Giampapa, M.S., Worden, S.P., Linsky, J.L.: Astrophys. J., 258, 740 (1982)ADSCrossRefGoogle Scholar
  5. Gray, D.F.: 1988, in Lectures on spectral-line a.na.lysis: F. G and K stars, Ed. Gray D.H..Google Scholar
  6. Houdebine, E.R. and Panagi, P.M.: 1990, Astron. Astrophys. 231, 459.ADSGoogle Scholar
  7. Kelch, W.L., Linsky, J.L., Worden, S.P.: Astrophys. J. 229, 700 (1979)ADSCrossRefGoogle Scholar
  8. Mould, J.R.: Astron. Astrophys. 48, 443 (1976)ADSGoogle Scholar
  9. Scharmer, G.B., Carlsson, M.: J. Comp. Phys. 59, 56 (1985)ADSMATHCrossRefGoogle Scholar
  10. Vernazza, J.E., Avrett, E.H., Loeser, R.: Astrophys. J. Suppl. 45, 635 (1981)ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Eric R. Houdebine
    • 1
    • 2
  1. 1.Armagh ObservatoryArmaghN. Ireland
  2. 2.Institut d’Astrophysique SpatialeUniversité Paris XIOrsayFrance

Personalised recommendations