Astrophysics and Space Science

, Volume 164, Issue 2, pp 263–276 | Cite as

A comparison of the near-ultraviolet continuum and chromospheric emission line fluxes of the late-type giant stars

  • Kâmuran Avcioglu
  • M. Türker Özkan
  • H. Hüseyin Mentese
Article
  • 35 Downloads

Abstract

We investigate the near-ultraviolet high-resolution LWR spectra of the stars α Cas, β And, α Tau, β Gem, γ Cru, α Boo, and β Peg, obtained with the aid of the International Ultraviolet Explorer Satellite. We have given here a list of the strongest and most prevalent emission lines in the near-ultraviolet spectra of α Boo, KlIIIp, and β Peg, M2.5II-III which have the same luminosity class and different spectral type. The near-ultraviolet continuum flux measurements and integrated emission line fluxes of these stars for the 2500–3200 Å region are presented in order to compare the variations in the appearance of the near-ultraviolet flux distribution with the temperature structure of their chromospheres for K and M giant stars. We also discuss differences between observed and calculated fluxes found from the Planck function.

Keywords

Emission Line Temperature Structure Flux Measurement Flux Distribution Spectral Type 

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Kâmuran Avcioglu
    • 1
  • M. Türker Özkan
    • 1
  • H. Hüseyin Mentese
    • 1
  1. 1.Department of Astronomy and Space Sciences, Faculty of ScienceUniversity of IstanbulTurkey

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