GRW +70 8247
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GRW +70 8247 is a white dwarf star located 42 light-years from Earth[1] in the constellation Draco. With a magnitude of about 13 it is visible only through a large telescope.
Properties
Although photographed in the 19th century as part of the Carte du Ciel project, the star was not determined to be a white dwarf until G. P. Kuiper observed it in 1934.[2] This makes it the fifth or sixth white dwarf discovered.Template:Efn At first, its spectrum was thought to be almost featureless,[2] but later observation showed it to have unusual broad, shallow absorption bands.[3][4] In 1970, when light that it emitted was observed to be circularly polarized, it became the first white dwarf known to have a magnetic field.[5][6] In the 1980s, it was realized that the unusual absorption bands could be explained as hydrogen absorption lines shifted by the Zeeman effect.[7][8][9]
Notes
References
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