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2020ApJ...897...70P - Astrophys. J., 897, 70-70 (2020/July-1)

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.R., CEJUDO D., CAMPBELL T., ROBERTS G., JONES J., COOK L.M., BOLT G., REA R., ULOWETZ J., KRAJCI T., MENZIES K., LOWTHER S., GOFF W., STEIN W., WOOD M.A., MYERS G., STONE G., UTHAS H., KARAMEHMETOGLU E., SEARGEANT J. and McCORMICK J.

Abstract (from CDS):

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.

Abstract Copyright: © 2020. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Cataclysmic variable stars - Classical novae - Close binary stars - DQ Herculis stars - Interacting binary stars - Novae - Stellar accretion - Stellar accretion disks

Simbad objects: 9

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