IPs by Orbit/Spin Ratio

The orbital period (P_orb) to spin period (P_spin) 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 P_orb/P_spin. 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).

	Star	P_orb/P_spin	P_orb (hrs)	P_spin (s)	Remarks
1	AE Aqr	1075.2887	9.8797346	33.07673996	Propeller
2	LAMOST J024048.51+195226.9	1059.29	7.3364	24.9328	Propeller
3	GK Per	491.073	47.9249	351.332	Outburst
4	V1460 Her	461.9977	4.9884535	38.87126
5	V2731 Oph	433.716	15.421	127.9999	Polarized
6	Swift J2006.4+3645	360.3	17.2842	172.7
7	CTCV J2056-3014	322	1.76	29.6	LLIP
8	DQ Her	235.4001	4.646902	71.065583	Eclipsing
9	XY Ari	105.8313	6.06471936	206.3	Eclipsing, Outburst
10	V455 And	71.9482	1.351421	67.619685	LLIP
11	CXOGBS J174954.5-294335	61.575	8.60890	503.32	Eclipsing
12	PBC J1841.1+0138	61.4901	5.325811	311.805
13	V709 Cas	61.3800	5.3328984	312.78
14	NY Lup	51.3	9.87	693.01
15	1RXS J213344.1+510725	45.3037	7.13834	570.8189	Polarized
16	V667 Pup	39.42	5.611	512.42
17	1RXS J180431.1-273932	36.37	4.99	493.97
18	V2069 Cyg	36.2243	7.48039	743.4065
19	V3037 Oph	33.1	5.722	623
20	V418 Gem	32.7237	4.36925	480.670036
21	EI UMa	31.24	6.434	741.6
22	V349 Aqr	29.81	3.23	390.15
23	V405 Aur	27.3438	4.143012	545.4555	Polarized
24	DO Dra	26.994	3.96898	529.31	Outburst
25	V1674 Her	26.362	3.6725	501.51
26	IGR J15094-6649	26.15	5.88	809.42
27	V1033 Cas	25.7833	4.033	563.1163
28	1RXS J230645.0+550816	25.3	3.26	464.452
29	Swift J0717.8-2156	24.7094	5.515	803.5
30	IGR J17014-4306	24.8182	12.8166	1859.11
31	IGR J16547-1916	24.46	3.715	546.6606
32	IGR J16500-3307	22.77	3.617	571.9
33	PQ Gem	22.4297	5.1926	833.41992	Polarized
34	V515 And	21.1219	2.731087	465.48493
35	V4743 Sgr	18.09	6.7176	1337
36	PBC J0927.8-6945	16.70	4.790	1033.05
37	V1223 Sgr	16.25	3.365856	745.6
38	Swift J2138.8+5544	16.11	4.426	989.167
39	AO Psc	16.0551	3.591012	805.2034
40	HZ Pup	15.1	5.09	1210.9
41	UU Col	14.4	3.45	863.5
42	MU Cam	14.3082	4.7186	1187.2184
43	FO Aqr	13.9169	4.849430	1254.4446
44	IGR J17195-4100	13.68	4.006	1054
45	V647 Aur	13.3735	3.46565	932.9123
46	IGR J19267+1325	13.28	3.449	935.1
47	V2400 Oph	13.3	3.43	927.66	Diskless; Polarized
48	CC Scl	12.992	1.4056136	389.49	LLIP
49	BG CMi	12.7446	3.2339650	913.50660	Polarized
50	1RXS J211336.1+542226	11.9	4.17	1265.6
51	AX J1853.3-0128	11.0	1.45	476.0	LLIP
52	V2306 Cyg	10.7299	4.371490	1466.67952
53	TX Col	10.73	5.691	1909.5
54	IGR J18308-1232	10.6	5.374	1820	LLIP
55	V1323 Her	10.4225	4.4021	1520.510	"
56	TV Col	10.34	5.486398	1909.7	"
57	HT Cam	10.017	1.43309	515.0592	LLIP; Outburst
58	V1062 Tau	9.5	9.98119	3800
59	RX J2015.6+3711	6.384	12.7611	7196
60	IGR J18173-2509	3.31	1.53	1663.4	LLIP
51	V1025 Cen	2.365	1.410	2146.59	SP
62	DW Cnc	2.2316	1.435024	2315.027	LLIP; Outburst
63	V598 Peg	1.9953	1.3854	2499.6	Eclipsing; LLIP; Outburst
64	EX Hya	1.4659	1.6376123	4021.6162	Eclipsing; LLIP; Outburst

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IPs by Orbit/Spin Ratio