UV spectroscopy of the 44 nearest white dwarfs reveals a 2–6% temperature discrepancy between UV and optical model fits, six UV-only metal detections, and a 30% planetary debris accretion rate.
Discovery of Molecular Hydrogen in White Dwarf Atmospheres
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abstract
With the Cosmic Origins Spectrograph onboard the Hubble Space Telescope, we have detected molecular hydrogen in the atmospheres of three white dwarfs with effective temperatures below 14,000 K, G29-38, GD 133 and GD 31. This discovery provides new independent constraints on the stellar temperature and surface gravity of white dwarfs.
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White dwarfs within 13 pc: Insights from ultraviolet spectroscopy
UV spectroscopy of the 44 nearest white dwarfs reveals a 2–6% temperature discrepancy between UV and optical model fits, six UV-only metal detections, and a 30% planetary debris accretion rate.