The Spin-period History of Intermediate Polars

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DOI

  • Joseph Patterson, Columbia University
  • ,
  • Enrique De Miguel, University of Huevla, CBA-Huelva
  • ,
  • Jonathan Kemp, Middlebury College
  • ,
  • Shawn Dvorak, CBA-Orlando
  • ,
  • Berto Monard, Kleinkaroo Observatory
  • ,
  • Franz Josef Hambsch, CBA-Mol
  • ,
  • Tonny Vanmunster, CBA-Belgium, CBA-Extremadura
  • ,
  • David R. Skillman, CBA-East
  • ,
  • David Cejudo, CBA-Madrid
  • ,
  • Tut Campbell, CBA-Arkansas
  • ,
  • George Roberts, CBA-Tennessee
  • ,
  • Jim Jones, CBA-Oregon
  • ,
  • Lewis M. Cook, CBA-Concord
  • ,
  • Greg Bolt, CBA-Perth
  • ,
  • Robert Rea, Regent Lane Observatory
  • ,
  • Joseph Ulowetz, CBA-Illinois
  • ,
  • Thomas Krajci, CBA-New Mexico
  • ,
  • Kenneth Menzies, CBA-Framingham
  • ,
  • Simon Lowther, Jim Lowther Observatory
  • ,
  • William Goff, CBA-Sutter Creek
  • ,
  • William Stein, CBA-Las Cruces
  • ,
  • Matt A. Wood, Texas A&M University-Commerce
  • ,
  • Gordon Myers, CBA-San Mateo
  • ,
  • Geoffrey Stone, CBA-Sierras
  • ,
  • Helena Uthas, Viktor Rydberg-Djursholm
  • ,
  • Emir Karamehmetoglu
  • Jim Seargeant, CBA-Edgewood
  • ,
  • Jennie Mccormick, Farm Cove Observatory

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.

OriginalsprogEngelsk
Artikelnummer70
TidsskriftAstrophysical Journal
Vol/bind897
Nummer1
Antal sider6
ISSN0004-637X
DOI
StatusUdgivet - 2020

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