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Coronal Structure in M Dwarf Stars

  • M. S. Giampapa
  • R. Rosner
  • V. Kashyap
  • T. A. Fleming
  • J. H. M. M. Schmitt
  • J. A. Bookbinder

Abstract

In view of the importance of these objects as observational probes for theories of stellar dynamos and coronal heating, as well as their potentially important role in the galactic environment, we implemented a program of pointed ROSAT PSPC observations of selected M dwarfs in the solar neighborhood. We derive key coronal plasma parameters based on the observed PSPC pulse-height distributions in order to investigate stellar coronal structure in more detail. In particular, we utilize temperatures and emission measures inferred for one or more distinct coronal components as constraints for the development of semi-empirical magnetic loop models as representations of the coronae of low mass stars (Giampapaet al. 1995).

Keywords

Coronal Structure Coronal Heating Dynamo Action Dwarf Star National Solar Observator 
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.

References

  1. Giampapa, M. S., Rosner, R., Kashyap, V., Fleming, T. A., Schmitt, J.H.M.M., & Bookbinder, J. A. (1995) The Coronae of Low Mass Dwarf Stars, ApJ, submitted.Google Scholar
  2. Rosner, R., Tucker, W. H., Vaiana, G. S. (1978) Dynamics of the Quiescent Solar Corona, ApJ, 220, 643–665.ADSCrossRefGoogle Scholar
  3. Stauffer, J. & Hartmann, L. (1987) The Distribution of Rotational Velocities for Low-Mass Stars in the Pleiades, ApJ, 318, 337–355.ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • M. S. Giampapa
    • 1
  • R. Rosner
    • 2
  • V. Kashyap
    • 2
  • T. A. Fleming
    • 3
  • J. H. M. M. Schmitt
    • 4
  • J. A. Bookbinder
    • 5
  1. 1.National Solar ObservatoryNational Optical Astronomy ObservatoriesTucsonUSA
  2. 2.Department of Astronomy & AstrophysicsUniversity of ChicagoChicagoUSA
  3. 3.Steward ObservatoryUniversity of ArizonaTucsonUSA
  4. 4.Max-Planck-Institut für Extraterrestrische PhysikGarchingGermany
  5. 5.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA

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