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- W1579307558 abstract "Observational evidence for the existence of a chromosphere on the cool magnetic white dwarf GD 356 has been reported. In addition, there has been theoretical speculations that cool magnetic white dwarfs may be sources of coronal X-ray emission. This emission, if it exists, would be distinct from the two types of X-ray emission (deep photospheric and shocked wind) that have already been observed from hot white dwarfs. We have used the PSPC instrument on ROSAT to observe three of the most prominent DA white dwarf candidates for coronal X-ray emission: GD 356, KUV 2316+123, and GD 90. The data show no significant emission for these stars. The derived upper limits for the X-ray luminosities provide constraints for a revision of current theories of the generation of nonradiative energy in white dwarfs." @default.
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- W1579307558 date "1995-11-01" @default.
- W1579307558 modified "2023-09-27" @default.
- W1579307558 title "[ITAL]ROSAT[/ITAL] Pointed Observations of Cool Magnetic White Dwarfs" @default.
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- W1579307558 doi "https://doi.org/10.1086/309741" @default.
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