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Evidence for Flash Mixing in He-rich sdB Stars
Allen V. Sweigart, Thierry Lanz, Thomas M. Brown +2
We present FUSE spectra of three He-rich sdB stars. Two of these stars, PG1544+488 and JL87, reveal extremely strong C III lines, suggesting that they have mixed triple-alpha carbo…
Flash Mixing on the White Dwarf Cooling Curve: FUSE Observations of three He-rich sdB Stars
Thierry Lanz, Thomas M. Brown, Allen V. Sweigart +2
We present FUSE spectra of 3 He-rich sdB stars. Two of these stars, PG1544+488 and JL87, reveal extremely strong C III lines at 977 and 1176A, while the carbon lines are quite weak…
A Possible Bifurcation in Atmospheres of Strongly Irradiated Stars and Planets
I. Hubeny, A. Burrows, D. Sudarsky
We show that under certain circumstances the differences between the absorption mean and Planck mean opacities can lead to multiple solutions for an LTE atmospheric structure. Sinc…
Anomalous ultraviolet line flux ratios in the cataclysmic variables 1RXSJ232953.9+062814, CE315, BZ UMa and EY Cyg observed with HST/STIS
Boris T. Gänsicke, Paula Szkody, Domitilla de Martino +6
Brief HST/STIS spectroscopic snapshot exposures of the cataclysmic variables 1RXSJ232953.9+062814, CE315, BZ UMa and EY Cyg reveal very large NV/CIV line flux ratios, similar to th…
Non-LTE Model Atmospheres for Late-Type Stars II. Restricted NLTE Calculations for a Solar-Like Atmosphere
C. Allende Prieto, I. Hubeny, D. L. Lambert
We test our knowledge of the atomic opacity in the solar UV spectrum. Using the atomic data compiled in Paper I from modern, publicly available, databases, we perform calculations…