A search for Helium in Ultramassive White Dwarfs
We have obtained extreme ultraviolet (EUV) spectra of eight hot, ultramassive white dwarfs (M = 0.9-1.3 M⊙) with the Extreme Ultraviolet Explorer. The stars are, on average, twice as massive as normal white dwarfs. The relatively high turnout of ultrama
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|Source:||Astrophysical Journal, The|
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