National Aeronautics and Space Administration

IPs

V455 And
V515 And
AE Aqr
FO Aqr
V349 Aqr
XY Ari
V405 Aur
V647 Aur
HT Cam
MU Cam
DW Cnc
BG CMi
V709 Cas
V1025 Cen
V1033 Cas
TV Col
TX Col
UU Col
V2069 Cyg
V2306 Cyg
DO Dra
PQ Gem
V418 Gem
DQ Her
V1323 Her
V1460 Her
V1674 Her
EX Hya
NY Lup
V2400 Oph
V2731 Oph
V3037 Oph
V598 Peg
GK Per
AO Psc
HZ Pup
V667 Pup
WX Pyx
V1223 Sgr
V4743 Sgr
CC Scl
V1062 Tau
EI UMa
AX J1740.1
AX J1832.3
AX J1853.3
CTCV J2056
CXO J174954
IGR J04571
IGR J08390
IGR J15094
IGR J16500
IGR J16547
IGR J17014
IGR J17195
IGR J18151
IGR J18173
IGR J18308
IGR J19267
LAMOST 0240
PBC J0927.8
PBC J1841.1
RX J1804
RX J2015
RX J2113
RX J2133
RX J2306
Swift J0717
Swift J1839
Swift J2006
Swift J2138

Full Catalog

Related Systems

Position:

• Equatorial: 20^h40^m09.24^s, -00^d52^m14.8^s (Gaia)
• Galactic: l=45.28, b=-24.42

Finding Chart:

Williams (1983)

Brigntness:

Optical: G=10.9 (Gaia); X-rays: 1.4x10^-11 ergs cm^-2s^-1 (4XMM-DR11)

IP Credential:

***** (Ironclad) The spin and the orbital periods are well established, so is the fact that some of the luminosity is from accretion.

Periods:

• Orbital: 0.41165610 d = 9.8797346 hr= 35567.087 s, absorption lines of the secondary.

  HJD = 2445171.2784 + 0.411655610E

  (de Jager et al. 1994)
• Spin: 0.0003828326384 d = 0.551278999 min = 33.07673996 s, seen in optical/UV/X-rays.

  Tmax = BJED 2445172.000042(1) + 0.00038283263840(28)E with Pdot=5.642(20)x10^-14 d d^-1 and second derivative Pdotdot=3.43x10^-19 d^-1

  (Li et al. 2016)
• Others:

Inclination:

66? 50?

Distance:

91.34+/-0.13 pc (Gaia EDR3: Parallax 10.9112+/-0.0181 mas)

References

This list is probably still incomplete; suggestions on references that should be included are welcome.

1. Zinner 1938 (archival photographic photometry)
2. Joy 1943 (optical spectroscopy)
3. Henize 1949 (optical photometry)
4. Lenouvel & Daguillon 1954 (optical photometry)
5. Joy 1954 (optical specroscopy)
6. Crawford & Kraft 1956 (optical spectroscopy)
7. Patterson 1979 (optical photometry)
8. Jameson, King & Sherrington 1980 (ultraviolet)
9. Feldt & Chincarini 1980 (optical spectroscopy)
10. Patterson et al. 1980 (X-ray and optical photometry)
11. Tanzi, Chincarini & Tarenghi 1981 (infrared photometry)
12. Chincarini & Walker 1981 (optical spectroscopy)
13. Szkody, Michalsky & Stokes 1982 (optical polarimetry)
14. Wade 1982 (optical spectrophotometry)
15. Willams 1983 (optical spectroscopy and finding charts)
16. Cropper 1986 (optical polarimetry)
17. Bookbinder & Lamb 1987 (radio)
18. Bastian, Dulk & Chanmugam 1988 (radio)
19. Imamura & Steiman-Cameron 1988 (optical QPO search)
20. Norton & Watson 1989a (spin equilbrium)
21. Norton & Watson 1989b (X-rays)
22. Echevarria et al. 1989 (optical spectroscopy)
23. van Paradijs, van Amerongen & Karaakman 1989 (optical photometry)
24. Eracleous, Patterson & Halpern 1991 (X-ray timing)
25. Robinson, Shafter & Balachandran 1991 (optical spectroscopy & photometry)
26. de Jager 1991 (X-rays)
27. Bruch 1991 (optical photometry)
28. Eracleous, Halpern & Patterson 1991 (X-ray spectroscopy)
29. Bowden et al. 1992 (gamma-rays)
30. Meintjes et al. 1992 (gamma-rays)
31. Stockman et al. 1992 (optical polarimetry)
32. Marsh 1992 (optical spin modulation)
33. de Jager & Meintjes 1993 (optical photometry)
34. Welsh, Horne & Oke 1993 (optical spectroscopy)
35. Abada-Simon et al. 1993 (radio)
36. Welsh, Horne & Gormer 1993 (optical spectroscopy)
37. Reinsch & Beuermann 1994 (optical spectrscopy)
38. de Jager 1994 (millisecond pulsar analog)
39. de Jager et al. 1994 (optical photometry)
40. Eracleous et al. 1994 (time-resolved UV spectroscopy and optical photometry)
41. Meintjes et al. 1994 (optical photometry and gamma-rays)
42. Reinsch et al. 1995 (X-rays)
43. Abada-Simon et al. 1995 (radio and optical photometry)
44. Mouchet et al. 1995 (optical spectroscopy)
45. Osborne et al. 1995 (X-rays, ultraviolet & optical)
46. Clayton & Osborne 1995 (X-rays)
47. de Martino, Wamsteker & Bromage 1995 (ultraviolet)
48. Ikhsanov 1995 (neutron star model)
49. Welsh, Horne & Gormer 1995 (optical spectroscopy)
50. Chadwick et al. 1995 (gamma-rays)
51. Eracleous et al. 1996 (time-resolved ultraviolet spectroscopy)
52. Beskrovnaya et al. 1996 (optical photometry & polarimetry)
53. Bastian, Beasley & Bookbinder 1996 (radio)
54. Richman 1996 (X-rays)
55. Casares et al. 1996 (optical spectroscopy)
56. Welsh & Martell 1996 (optical spectroscopy)
57. Eracleous & Horne 1996 (time-resolved ultraviolet spectroscopy)
58. Mauche, Lee & Kallman 1997 (ultraviolet spectroscopy)
59. Wynn, King & Horne 1997 (propeller model)
60. Kuijpers et al. 1997 (particle acceleration)
61. Friedjung 1997 (parallax)
62. Cropper, Ramsay & Wu 1998 (X-ray spectroscopy)
63. Welsh, Horne & Gormer 1998 (optical spectroscopy)
64. Ikhsanov 1998 (spin-down power)
65. Ezuka & Ishida 1999 (X-ray spectroscopy)
66. Ikhsanov 1999 (magnetic field amplification model)
67. Cropper et al. 1999 (post-chock model with gravity)
68. Choi et al. 1999 (X-rays)
69. Meintjes & de Jager 2000 (propeller)
70. Ikhsanov 2000 (disk outide the magnetosphere)
71. Ikhsanov 2001 (no accretion onto the white dwarf?)
72. Ikhsanov, Jordan & Beskrovnaya 2002 (optical polarization)
73. Ikhsanov & Beskrovnaya 2002 (potential gravitational radiation)
74. Meintjes 2002 (evolutionary scenario)
75. Schenker et al. 2002 (evolutionary scenario)
76. Skidmore et al. 2003 (optical spectroscopy)
77. Pearson, Horne & Skidmore 2003 (flare model)
78. Meintjes & Venter 2003 (radio flare model)
79. Ikhsanov, Neustroev & Beskrovnaya 2004 (plusar-like spin-down)
80. Meintjes 2004 (magnetic blob accretion)
81. Meintjes & Venter 2005 (magnetic blob accretion)
82. Parker, Norton & Mukai 2005 (X-ray timing)
83. Ikhsanov & Biermann 2006 (particle acceleration)
84. Venter & Meintjes 2006 (thermal & non-thermal emissions)
85. Itoh et al. 2006 (X-ray spectroscopy)
86. Ikhsanov 2006 (X-ray emission site)
87. Watson, Dhillon & Shahbaz 2006 (Roche tomography)
88. Mauche 2006 (X-ray pulse timing)
89. Choi & Dotani 2006 (X-rays)
90. Venter & Meintjes 2007 (model of unpulsed X-rays)
91. Dubus et al. 2007 (far infrared)
92. Terada et al. 2008 (X-rays)
93. Echevarria et al. 2008 (optical spectroscopy)
94. Brunschweiger et al. 2009 (X-rays)
95. Butters et al. 2009 (optical photometry & polarimetry)
96. Mauche 2009 (X-ray spectroscopy)
97. Sanad 2010 (ultraviolet)
98. Scaringi et al. 2010 (X-rays)
99. Anzolin et al. 2010 (X-ray flickering) Sep
100. Froning et al. 2012 (far ultraviolet)
101. Oruru & Meintjes 2012 (X-rays)
102. Ikhsanov & Beskrovnaya 2012 (evolutionary model)
103. Zamanov et al. 2012 (optical photometry)
104. Godon et al. 2012 (far ultraviolet)
105. Kitaguchi et al. 2014 (X-rays)
106. Aleksic et al. 2014 (gamma-rays)
107. Hill et al. 2014 (optical spectroscopy)
108. Schlegel et al. 2014 (X-ray spectroscopy)
109. Isakova et al. 2016 (MHD Simulation)
110. Hill et al. 2016 (optical spectroscopy)
111. Li et al. 2016 (gamma-rays)
112. Zamanov et al. 2017 (optical photometry)
113. Zamanov & Latev 2017 (optical photometry)
114. Barrett et al. 2017 (radio)
115. Campana et al. 2018 (optical & multiwavelength)
116. Blinova et al. 2019 (MHD model)
117. Simon 2020 (long-term optical photometry)
118. Ramirez & Echevarria 2021 (optical spectroscopy)