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- W2037773196 abstract "An apparent H$alpha$ absorption feature has been detected in image tube scans of the cool magnetic white dwarf G99-47, previously classified as DC (featureless). The broad approx.2.5 A EW line is centered some 21 A shortword from the normal H$alpha$ position. This lines is interpreted as the $pi$ component of H$alpha$-shifted by the quadratic Zeeman effect in a surface field of approx.15x10$sup 6$ gauss. This interpretation is supported by the detection of the characteristic circular polarization of the sigma components at +-350 A in data obtained with the multichannel spectrophotometer. Both results are fitted well by a simple, centered dipole model with a mean longitudinal field of 5.6x10$sup 6$ gauss. However, the longitudinal field strength indicated from the continuum circular dichroism theory is about a factor of four smaller. The strength of the H$alpha$ absorption and absence of other detectable Balmer and Ca ii lines are consistent with G99-47 being a very cool, metal-poor DA star. (AIP)" @default.
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- W2037773196 date "1975-12-01" @default.
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- W2037773196 title "The detection of an H alpha Zeeman pattern in the cool magnetic withedwarf G99-47." @default.
- W2037773196 doi "https://doi.org/10.1086/181998" @default.
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