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: 19^h58^m14.48^s, +32^d32^m42.2^s (J2000)
• Galactic: l=69.05, b=+1.70

Finding Chart:

Israel et al (1999) (their star B).

Brigntness:

Optical V~16; fx (2-10 keV)~1.0x10^-11 ergs cm^-2s^-1 (ASCA)

Periods:

• Orbital: 0.181 d = 4.35 h = 15660 s from optical spectroscopy and photometry according to Zharikov, Tovmassian & Echevarria (2002).; 0.2245 d = 5.387 h = 19393 s, according Norton et al (2002).
• Spin: 0.0169752 d = 24.44 min = 1466.66 s, from optical and X-ray photometry, in which half the spin period (733.33 s) is the dominant period.

  HJD = 2451739.318445(2) + 0.0084876(4)E

  (Norton et al 2002) for the two equally spaced minima per spin period.
• Others: Beat period of 1587.24 s is present in optical photometry, although one of its one-day aliases is stronger in the periodogram.

Inclination:

?

Distance:

?

Originally proposed as a Be/neutron star binary, but this is an IP.

References

• Israel et al 1998
• Israel et al 1999
• Negueruela, Reig & Clark 2000
• Norton et al 2002
• Parker, Norton & Mukai 2005
• Uslenghi et al 2000
• Uslenghi et al 2001
• Zharikov et al 2001
• Zharikov, Tovmassian & Echevarria 2002