Abstract
We have used optical and UV spectroscopy to determine He abundances and upper limits to He abundances in the photospheres of a selected sample of very hot hydrogen-rich white Dwarfs He abundances in the range log(He/H) −3 to −1.5 are observed in several of these DAs and upper limits of −3 determined for the remainder. In apparent contradiction to the relatively large He abundances inferred from soft X-ray observations for the hot DA G191 B2B, we find no evidence of He in the optical and UV.
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Holberg, J.B., Kidder, K., Liebert, J., Wesemael, F. (1989). Helium abundance in the photospheres of hot DA white dwarfs. In: Wegner, G. (eds) White Dwarfs. Lecture Notes in Physics, vol 328. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-51031-1_316
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DOI: https://doi.org/10.1007/3-540-51031-1_316
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