Query= gk per GCVS Query forms
  NNo      GCVS          J2000.0            Type      Max        Min I         Min II       Epoch        Year      Period          M-m/D     Spectrum      References  Other desig. p.m.(as/yr)   Epoch     Ident.     New type    GCVS
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630193 |GK    Per *|033112.01 +435415.4 |NA+XP     |  0.2    |  14.0      |            |V |15439.      |1901 |                    |     |pec(Nova)        |      09515|           |             |1989.760| |GSC2.2   |          |GK    Per |
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_______________Cross-identifications:_______________
GK    Per     = AN   1901.0003                |     
GK    Per     = BD   +43 0740                 |a    
GK    Per     = GSC  2874.00922               |     
GK    Per     = HD   021629                   |     
GK    Per     = X    03277+432                |     
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      Reference to a chart or photograph:
09515. G.Williams, ApJ Suppl 53, 523, 1983.

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Remark: 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 [09686, 09788]. According to [10198], 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 [10199], 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 [09786]. ExpAnding envelope (0.454"/yr, 1948 - 1964; 0.432"/yr, 1964 - 1981, [09787]).

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