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The Discovery of λ Bootis Stars: The Southern Survey I

  • Authors: R. O. Gray, Q. S. Riggs, C. Koen, S. J. Murphy, I. M. Newsome, C. J. Corbally, K.-P. Cheng, and J. E. Neff

2017 The Astronomical Journal 154 31.

  • Provider: AAS Journals

Caption: Figure 1.

Normal A-type stars (open circles) and λ Bootis stars (red squares and diamonds) are plotted in a color–color diagram. The ordinate is a color formed from the difference of the GALEX far-ultraviolet magnitude and the 2MASS K magnitude, and the abscissa is the V − K color. The FUV magnitudes for the λ Bootis stars indicated by the diamonds have been computed by numerical integration of IUE spectra, using the GALEX FUV passband and transformed to the GALEX system. It is clear that the λ Bootis stars, with one exception, lie on or near the lower envelope of the distribution of A-type stars in this diagram, and thus exhibit, for a given V − K color, an FUV excess relative to most normal A-type stars. The arrow shows the reddening vector for ﹩E(B-V)=0.1﹩.

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