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IUE observations of cool stars: α Aurigae, HR1099, λ Andromedae, and ε Eridani

Nature volume 275, pages 389–394 (1978)Cite this article

Abstract

Initial IUE observations of four cool stars are reported. Observed fluxes and surface fluxes are given for several UV emission lines in the spectral range 1,175–2,000 Å, obtained at low and high dispersion with the short-wavelength spectrograph and camera. These lines are formed in the outer atmospheres of these stars, in regions presumably analogous to the solar chromosphere and transition region. The surface fluxes in the lines increase along the sequence: quiet Sun, ε, Eri, λ And, α Aur, and HR1099. The 2.8-d RS CVn-type binary HR1099, observed on 1 March 1978 near the end of a major flaring episode, has line surface fluxes ∼100 times that of the quiet Sun, similar to those seen in solar flares. Line profiles and flux ratios in multiplets for Capella are presented, and comments given on the opacity of the lines and on a tendency of line width to increase with temperature of formation.

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Authors and Affiliations

  1. Joint Institute for Laboratory Astrophysics, NBS and University of Colorado, Boulder, Colorado, 80309

    J. L. Linsky, T. R. Ayres, G. S. Basri & N. D. Morrison

  2. Goddard Space Flight Center, Greenbelt, Maryland, 20771

    A. Boggess, F. H. Schiffer III & A. Holm

  3. ESA Satellite Tracking Station, Villafranca del Castillo, Madrid, Spain

    A. Cassatella & A. Heck

  4. Astronomy Division, ESTEC, Noordwijk, Holland

    F. Macchetto

  5. SRC, Appleton Laboratory, Slough, Berks, UK

    D. Stickland

  6. University College London, Gower St, London, WC1, UK

    R. Wilson

  7. Osservatorio Astrofisico, Catania, Italy

    C. Blanco

  8. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, 02138

    A. K. Dupree

  9. Department of Theoretical Physics, 1 Keble Rd, Oxford, UK

    C. Jordan

  10. Astronomy Department, Ohio State University, Columbus, Ohio, 43210

    R. F. Wing

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Linsky, J., Ayres, T., Basri, G. et al. IUE observations of cool stars: α Aurigae, HR1099, λ Andromedae, and ε Eridani. Nature 275, 389–394 (1978). https://doi.org/10.1038/275389a0

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