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: 18^h07^m30.12^s, +45^d51^m32.7^s (J2000)
• Galactic: l=73.15, b=+26.44

Finding Chart:

Brigntness:

Optical ; fx (2-10 keV)~?

Periods:

• Orbital: 0.19362 d = 4.65 hr = 16729 s, from optical eclipses.

  Tmin = HEJD 2434954.94429(8) + 0.1936208964(12)E

  (Zhang et al 1995, who also give a quadratic version).
• Spin: 8.2252e-02 day = 1.18 min = 71.066 s, seen in optical photometry.

  Tmax = HEJD 2439628.77177(3) + 8.22518320(3)e-04 E - 2.62(4)e-16 E^2 + 2.8(1)e-24 E^3

  (Zhang et al 1995). The 71 s period has long been thought to be the spin period, but Zhang et al 1995 prsents strong (but indirect) evidence that the true spin period is twice this value.
• Others:

Inclination:

~90 deg (deep eclipse, front half of disk is probably hidden)

Distance:

561+/-19 pc (Herbig & Smak 1992)

References

• Adams et al 1935
• Adams & Joy 1936
• Chanan, Nelson & Margon 1978
• Cordova & Mason 1985
• Ferland & Truran 1981
• Herbig & Smak 1992
• Horne, Welsh & Wade 1983
• Hutchings, Cowley & Crampton 1979
• Kraft 1964
• Mauche, Lee & Kallman 1997
• Nather & Warner 1969
• Patterson 1979a
• Patterson, Robinso & Nather 1978
• Petitjean, Boisson & Pequignot 1990
• Petterson 1980
• Richman 1996
• Silber et al 1996a
• Silber et al 1996b
• Slavin, O'Brien & Dunlop 1995
• Walker 1956
• Walker 1958
• Warner et al 1972
• Welsh & Martell 1996
• Zhang et al 1995