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Name
  GK Per  
AAVSO UID
000-BBG-044 (60712 observations)  
Const. Perseus
J2000.0
03 31 12.01 +43 54 15.4  (52.80004 +43.90428) Search nearby
B1950.0 03 27 47.50 +43 44 03.5
Galactic coord. 150.956 -10.104
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1RXS J033111.9+435427 2MASS J03311201+4354154 AAVSO 0324+43
AN 3.1901 BD+43 740 Downes GK Per
GSC 02874-00922 HD 21629 X 03277+432
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Var. type
NA/DQ+UG
Spec. type WD+K2IVe
Mag. range
0.2 - 14.0 V
Discoverer T. D. Anderson
Epoch
23 Feb 1901 (HJD 2415439.00000) Ephemeris
Outburst 1901
Period 1.996803
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Outburst cycle 880-1240 d. Maximum has varied between V= 9.7 and 11.3.
2 GCVS Team SB2 (sdBE + K2IVp). The following types of activity are being observed after the return to the normal brightness: rapid irregular variations (Delta(m) ~0.1m in several minutes); irregular fluctuations from night to night (Delta(m) up to 0.3m); slow irregular variations (Delta(m) = 1.5m in several dozen days); bursts with light increase in 10d - 30d and decrease in 10d - 40d, Delta(m) up to 3.5m, the mean interval between bursts being delta(t) = 820d [F.Sabbadin, A.Bianchini, AsAp Suppl 54, 393, 1983., R.Hudec, BAC 35, N3, 150, 1984.]. According to [D.Crampton, A.P.Cowley, W.A. Fisher, ApJ 300, 788, 1986.], the radial velocities are represented with the elements Max (Vr > 0) = 2444912.966 + 1.996803d*E (Kabs = 124 km/s, Kem = 34 km/s). According to [N.E.Kurochkin, E.A.Karitskaya, Astron. Tsirk. N1441, 1986.], the 2d variation is modulated with a period of 0.131623d, Max (delta(Vr)) ~2443787.995 (Kabs = 15 km/s, Kem = 20 km/s). During a burst the sinusoidal modulation of X-ray flux was recorded, Tmax = 24455555.67456 + 0.004066443d*E [M.G.Watson, A.R.King, J.Osborne, MN 212, N4, 917, 1985.]. ExpAnding envelope (0.454"/yr, 1948 - 1964; 0.432"/yr, 1964 - 1981, [L.Muench, BAAS 16, 217, 1984.]).
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References
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1 Results of Optical Monitoring of Cataclysmic Variable GK Per in 2004 2006Ap&SS.304..287V
2 R.A.Downes, 2001, PASP 113, 764 (2006 archival) 2005JAD....11....2D
3 Catalogue of Stellar Spectral Classifications (Skiff, 2005) 2002MNRAS.329..597M
4 R.A.Downes, 2001, PASP 113, 764 2001PASP..113..764D
5 D. Crampton, A.P. Cowley, W.A. and Fisher, 1986, ApJ 300, 788 1986ApJ...300..788C
6 K. Mukai, The Intermediate Polars --
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Revision History
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5 Otero, Sebastian Alberto 2011-05-16 16:04 UTC Primary record creation. Variability and spectral types from reference.
4 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
3 Admin, VSX 2009-08-27 19:36 UTC Update from [1986ApJ...300..788C]
2 Admin, VSX 2007-03-23 15:52 UTC Discoverer added.
1 Admin, VSX 2005-12-17 20:33 UTC Initial database population.

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