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A correlation between GALEX FUV magnitude and chromospheric activity among red giant stars

  • Graeme H. Smith (a1)
Abstract

It is shown that upon combining GALEX far-ultraviolet and Johnson B magnitudes a resultant FUV–B colour can be obtained that for red giant stars of luminosity classes III and II correlates well with chromospheric emission in the cores of the Mg iih and k lines. Giant stars throughout the colour range 0.8 ≤ BV ≤ 1.6 exhibit such a phenomenon. The main result of this paper is to show that GALEX far-ultraviolet photometry can provide information about the degree of chromospheric activity among red giant stars, and as such may offer a tool for surveying the evolution of chromospheric activity from the main sequence into the red giant phases of stellar evolution.

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Corresponding author
Author for correspondence: Graeme H. Smith, Email: graeme@ucolick.org
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Publications of the Astronomical Society of Australia
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