Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pasp..122.1303s&link_type=abstract
Publications of the Astronomical Society of the Pacific, Volume 122, issue 897, pp.1303-1310
Astronomy and Astrophysics
Astronomy
1
Stars
Scientific paper
The magnitudes of F, G, and K dwarf stars measured in the FUV bandpass of the GALEX satellite are found to show correlations with chromospheric activity. Values of a color (m-B) were obtained by combining GALEX FUV and Johnson B magnitudes for a large sample of dwarfs for which published measurements of flux in the chromospheric Ca II H and K emission lines are available. Among dwarfs with (B-V)<0.8 the photospheric flux produces a two-color relation between m-B and B-V. A color excess Δ(m-B), obtained by making a first-order correction for this photospheric effect, shows a correlation with chromospheric activity for stars with logRHK' >-4.8, where RHK' is the ratio between the luminosity in the H and K emission lines and the bolometric luminosity. Among dwarfs with (B-V)>0.8 the photospheric contribution to the flux in the GALEX FUV bandpass is sufficiently low that the uncorrected m-B color shows a clear variation with logRHK'. The approximately linear nature of this relation indicates that the combined flux in the FUV band, which for such late-type dwarfs arises from transition-region and chromospheric emission lines, is related in a power-law manner to the flux in the Ca II H and K emission lines.
Redenbaugh Anja K.
Smith Graeme H.
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