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Radiation Losses in Chromospheric and Transition Region Emission Lines from AD Leo (dM4e)

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Activity in Cool Star Envelopes

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 143))

Abstract

We present line surface fluxes from the red dwarf flare star AD Leo in its quiescent state. IUE and ground-based instruments cover the UV and optical (1000–9000 Å) domains of the spectrum. The observed radiation losses from chromospheric and transition region lines amount to 4.0 * 106 erg cm−2s−1 and 2.7 * 105erg cm−2s−1, respectively. Further, from an analogy with solar active regions we estimate the total radiative energy loss in all lines formed between 25.000 K and 250.000 K to be of the order of 106 – 107 erg cm−2s−1.

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References

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Author information

Authors and Affiliations

  1. Institute of Theoretical Astrophysics, Univ. of Oslo, P.O. Box 1029, N-0315, Oslo 3, Norway

    S. R. Sundland, B. R. Pettersen & O. Kjeldseth-Moe

  2. Department of Astronomy and McDonald Observatory, University of Texas, 78712, Austin, TX, USA

    S. L. Hawley

  3. Space Science Department of ESA, ESTEC, Noordwijk, The Netherlands

    B. N. Andersen

  4. Guest Observer, McDonald Observatory, The Univ. of Texas, Austin, USA

    B. R. Pettersen

  5. Guest Observer, IUE, Villafranca, Spain

    B. N. Andersen

Authors
  1. S. R. Sundland
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  2. B. R. Pettersen
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  3. S. L. Hawley
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  4. O. Kjeldseth-Moe
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  5. B. N. Andersen
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Editor information

Editors and Affiliations

  1. Institute of Mathematical and Physical Sciences, University of Tromsø, Norway

    O. Havnes

  2. Institute of Theoretical Astrophysics, University of Oslo, Norway

    B. R. Pettersen

  3. Max-Planck-Institut fü extraterrestrische Physik, Garching, Germany

    J. H. M. M. Schmitt

  4. Institute of Mathematical and Physical Sciences, University of Tromsø, Norway

    J. E. Solheim

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© 1988 Kluwer Academic Publishers

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Sundland, S.R., Pettersen, B.R., Hawley, S.L., Kjeldseth-Moe, O., Andersen, B.N. (1988). Radiation Losses in Chromospheric and Transition Region Emission Lines from AD Leo (dM4e). In: Havnes, O., Pettersen, B.R., Schmitt, J.H.M.M., Solheim, J.E. (eds) Activity in Cool Star Envelopes. Astrophysics and Space Science Library, vol 143. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2951-7_8

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  • DOI: https://doi.org/10.1007/978-94-009-2951-7_8

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-7827-6

  • Online ISBN: 978-94-009-2951-7

  • eBook Packages: Springer Book Archive

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