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IPs by Orbit/Spin RatioThe orbital period (Porb) to spin period (Pspin) ratio is an important diagnostic of the accretion mode. Therefore, the table below lists 64 of the 71 confirmed/ironclad IPs from IP catalog 2021 in decreasing order of Porb/Pspin. The other 7 (IGR J04571+4527, WX Pyx, IGR J08390-4833, AX J1740.1-2847, IGR J18151-1052, AX J1832.3-0840, and Swift J183920.1-045350) are not included as their orbital periods are not known with any certainty. Note that there may still be a few additional cases where the adopted ratio is wrong. This may be because the adopted orbital period is an aliase (e.g., IGR J18308-1232 and IGR J18173-2509) or because the adopted spin period is actually the 1st harmonic (DQ Her).
Please send your comments, suggestions etc. to Koji.Mukai@nasa.gov and/or Koji.Mukai@umbc.edu |