http://arxiv.org/abs/2001.07288
We report the detailed history of spin-period changes in five intermediate polars (DQ Herculis, AO Piscium, FO Aquarii, V1223 Sagittarii, and BG Canis Minoris) during the 30-60 years since their original discovery. Most are slowly spinning up, although there are sometimes years-long episodes of spin-down. This is supportive of the idea that the underlying magnetic white dwarfs are near spin equilibrium. In addition to the ~40 stars sharing many properties and defined by their strong, pulsed X-ray emission, there are a few rotating much faster (P<80 s), whose membership in the class is still in doubt — and who are overdue for closer study.
J. Patterson, E. Miguel, J. Kemp, et. al.
Wed, 22 Jan 20
44/116
Comments: PDF, 13 pages, 1 table, 2 figures; submitted, ApJ; more info at this http URL
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