The Spin-period History of Intermediate Polars
Patterson J.
De Miguel E.
Kemp J.
Dvorak S.
Monard B.
Hambsch F.-J.
Vanmunster T.
Skillman D.
Cejudo D.
Campbell T.
Roberts G.
Jones J.L.
Cook L.M.
Bolt G.
Rea R.
Ulowetz J.
Krajci T.
Menzies K.
Lowther S.
Goff W.N.
Stein W.
Wood M.A.
Myers G.
Stone G.
Uthas H.
Karamehmetoglu E.
Seargeant J.
McCormick J.
Astrophysical Journal
Doi 10.3847/1538-4357/ab863d
Volumen 897
2020-07-01
Citas: 15
© 2020. The Author(s). Published by the American Astronomical Society.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 yr 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.
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