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
V2306 Cyg
YY Dra
PQ Gem
DQ Her
EX Hya
NY Lup
V2400 Oph
GK Per
AO Psc
WX Pyx
V1223 Sgr
V1062 Tau
RX J2133

Related Systems

Candidates

Position:

• Equatorial: 12^h52^m24.47^s, -29^d14^m57.5^s (J2000)
• Galactic: l=303.19, b=+33.62

Finding Chart:

Schwartz et al (1979)

Brightness:

V~13 in quiescence, 9.5 at peak of outbursts; fx (2-10 keV)~8.7x10^(-11) ergs/cm/cm/s (ASCA)

Periods:

• Orbital: 0.068233846 d = 1.637612394 hr= 5895.4s, see in optical and X-rays

  TDB(eclipse)=2437699.94179 + 0.068233846 E

  (Hellier & Sproats 1992) with 17.5yr cycle (?)

  O-C=-0.00027 + 0.00028sin[360(E/93500)+7]

• Spin: 0.046546504d = 67.02696576 min = 4021.617946s, seen in optical photometry, optical spectroscopy and X-rays.

  TDB(max)= 2437699.8914(5)+0.046546504(9)E-7.9(4)x10^{-13}E^2

  (Hellier & Sproats 1992)
• Others: Sideband(s) seen only during outbursts.

Inclination:

~77 deg (partial eclipse)

Distance:

65+-11 pc (Eisenbart et al 2002)

A rather atypical IP, in terms of spin and orbital periods. Evolutionary scenario and current accretion mode are both being debated. Although the the accretion curtain model was first developed for this system, and later successfully applied to other IPs, it does not seem to be applicable to EX Hya at all.

References

• Allan, Hellier & Beardmore 1998
• Belle et al 2002
• Belle et al 2003
• Belle et al 2005
• Beuermann & Osborne 1988
• Beuermann et al 2003
• Bond & Freeth 1988
• Bond et al 1987
• Bookbinder & Lamb 1987
• Breysacher & Vogt 1980
• Buckley & Schwarzenberg-Czerny 1992
• Cordova & Riegler 1979
• Cordova, Mason, & Kahn 1985
• Cowley, Hutchings & Crampton 1981
• Cropper 1986
• Cropper, Ramsay & Wu 1998a
• Cropper et al 1999
• Dhillon et al 1997
• Eisenbart et al 2002
• Eracleous, Patterson & Halpern 1991
• Eracleous, Halpern & Patterson 1991
• Ezuka & Ishida 1999
• Frank et al 1981
• Fujimoto & Ishida 1997
• Gilliland 1982
• Greeley et al 1997
• Heise et al 1987
• Hellier 1991
• Hellier 1992
• Hellier 1999
• Hellier & Sproats 1992
• Hellier & Mukai 2004
• Hellier et al 1987
• Hellier et al 1989
• Hellier, Garlick & Mason 1993
• Hellier, Mukai & Osborne 1998a
• Hellier et al 2000
• Hoogerwerf, Brickhouse & Mauche 2004
• Hoogerwerf, Brickhouse & Mauche 2005
• Hoogerwerf, Brickhouse & Mauche 2006
• Hurwitz et al 1997
• Ishida 1991
• Ishida et al 1994a
• Ishida, Mukai & Osborne 1994b
• Jablonski & Busko 1985
• Kaitchuck et al 1987
• King & Wynn 1999
• Mauche 1999
• Mauche, Lee & Kallman 1997
• Mauche, Liedahl & Fournier 2001
• Mukai et al 2003
• Mumford 1964
• Mumford 1967
• Mumford 1969
• Mumford 1970
• Mumford 1976
• Norton & Watson 1989b
• Papaloizou & Pringle 1980
• Ramsay 2000
• Reinsch & Beuermann 1990
• Rosen, Mason & Cordova 1988
• Rosen et al 1991
• Schwartz et al 1979
• Sherrington et al 1980
• Shylaja 1985
• Siegel et al 1989
• Singh & Swank 1993
• Sterken et al 1983
• Stockman et al 1992
• Suleimanov, Revnivtsev & Ritter 2005
• Vande Putte et al 2003
• Vogt, Krzeminski & Sterken 1980
• Wade 1982
• Warner 1972
• Warner & McGraw 1981
• Watson, Sherrington & Jameson 1978