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The Spin-Period History of Intermediate Polars
- Publication Year :
- 2020
-
Abstract
- 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.<br />Comment: PDF, 13 pages, 1 table, 2 figures; submitted, ApJ; more info at http://cbastro.org/
- Subjects :
- Astrophysics - Solar and Stellar Astrophysics
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.2001.07288
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/1538-4357/ab863d