National Aeronautics and Space Administration

IPs

AE Aqr
FO Aqr
XY Ari
V405 Aur
HT Cam
MU Cam
DW Cnc
BG CMi
V709 Cas
V1025 Cen
TV Col
TX Col
UU Col
V2069 Cyg
V2306 Cyg
YY Dra
PQ Gem
DQ Her
EX Hya
NY Lup
V2400 Oph
GK Per
AO Psc
WX Pyx
V1223 Sgr
V1062 Tau
EI UMa
IGR 00234
IGR 15094
IGR 17303
Swift J0732
RX J0704
RX J1803
RX J2133
SDSS J233325
XSS 00564

Full Catalog

Related Systems

Related Systems

Asynchronous Polars

BY Cam, V1500 Cyg, CD Ind, and V1432 Aql are asynchronous polars. Although the spin and orbital periods are different in these systems, the differences are small (of order 1% or less), and they are thought to be in a state of temporary asynchronism. Therefore, I will treat them differently from IPs, in which the spin periods are generally thought to be near the equilibrium values.

V471 Tau

There is no doubt this is a binary consisting of a red dwarf and a white dwarf, and the latter is undoubtedly asynchronously rotating and magnetic. However, accretion appears to be sporadic, at an extremely low level, or both. I prefer to define IPs such that only systems in which accretion usually provides a measurable fraction of the luminosity are included.

Z And

The coherent 25 min period found in this system appears convincing (although we could always use confirmation). I do not include this system because it is an symbiotic star with an M giant mass donor.