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- W4385394865 abstract "The convective dredge-up of carbon from the interiors of hydrogen-deficient white dwarfs has long been invoked to explain the presence of carbon absorption features in the spectra of cool DQ stars ($T_{rm eff} < 10{,}000,{rm K}$). It has been hypothesized that this transport process is not limited to DQ white dwarfs and also operates, albeit less efficiently, in non-DQ hydrogen-deficient white dwarfs within the same temperature range. This non-DQ population is predominantly composed of DC white dwarfs, which exhibit featureless optical spectra. However, no direct observational evidence of ubiquitous carbon pollution in DC stars has thus far been uncovered. In this Letter, we analyze data from the Galaxy Evolution Explorer (GALEX) to reveal the photometric signature of ultraviolet carbon lines in most DC white dwarfs in the $8500,{rm K} leq T_{rm eff} leq 10{,}500,{rm K}$ temperature range. Our results show that the vast majority of hydrogen-deficient white dwarfs experience carbon dredge-up at some point in their evolution." @default.
- W4385394865 created "2023-07-31" @default.
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- W4385394865 date "2023-07-04" @default.
- W4385394865 modified "2023-10-17" @default.
- W4385394865 title "The ubiquity of carbon dredge-up in hydrogen-deficient white dwarfs as revealed by GALEX" @default.
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- W4385394865 doi "https://doi.org/10.1093/mnrasl/slad105" @default.
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