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Relations Between FUV Excess and Coronal Soft X-Ray Emission Among Dwarf Stars

  • Graeme H. Smith (a1), Mason Hargrave (a2) and Elliot Eckholm (a2)
Abstract
Abstract

The far-ultraviolet magnitudes of late-F, G and early-K dwarfs with (BV) ⩾ 0.50 as measured by the GALEX satellite are shown to correlate with soft X-ray luminosity. This result indicates that line and continuum emission from stellar active regions make significant contributions to the flux in the GALEX FUV band for late-F, G and K dwarfs. By contrast, detection of a correlation between FUV brightness and soft X-ray luminosity among early-F dwarfs requires subtraction of the photospheric component from the FUV flux. The range in (BV) among F and G dwarfs over which a correlation between uncorrected FUV magnitude and X-ray luminosity is detected coincides with the range in colour over which coronal and chromospheric emission correlates with stellar rotation.

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3 Email: graeme@ucolick.org
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