[vsnet-chat 1126] Outburst history of V1504 Cyg

[Taichi Kato <tkato>]

Outburst history of V1504 Cyg

  Continuation of [vsnet-chat 203]:

  JD      mag type     observer/comments
------------------------------------------------------------
49514     134 super    VAN
49611     149 ?        SNO, 1 obs
49630     143 ?        SNO, 1 obs, 147: on 49632 (POY)
49653     140 ?        SNO, 1 obs
49660-662 144 ?        Myy,Ths
49864     145 ?        JEN, 1 obs
49895     156 precursor? rising?  PIE
49904-908 139 super    JEN,PIE
49930     159 normal?  PIE, 1 obs
49954     147 normal   PIE,JEN
49975     145 normal   PIE,JEN
50007     146 normal   PIE, 2 obs
50020-027 139 super    BRO,VAN,PIE
50110     143 ?        JEN, 1 obs
50219     146          POY, 1 obs
50229     149 related to 50219?  POY, no obs in between
50248     147 normal   POY, 2 obs
50270     152 normal   POY, 1 obs
50289     146 normal   POY,Kat
50312     153 normal   POY,Ths
50316     146? ?       FRF, 1 unsure obs.
50339-341 148 normal   POY,JEN
50361     148 normal   BRO,PIE,JEN
50372     152 normal   POY
50400-406 142 super    POY,JEN,BRO
50419     149: normal  POY, 1 obs
50506     168 normal?  JEN (single positive)
50527-534 139 super    POY, 2 obs
50557     157 normal?  JEN (single positive)
50575     146 normal   POY
50603     146 normal   POY,JEN
50651     152 normal   POY
50662-674 140 super    POY,BRO,KNN,JEN
50680     160 normal?  JEN
50690     147 normal   BRO,PIE,KNN
50694     151 normal   PIE, 1 obs, related to 50690 max?
50704     152 normal   POY, 2 obs
50717     154 normal   KNN, 2 obs
50723     152 normal?  POY, 1 obs
50739     151 normal   PIE, 1 obs
50750     144 normal   BRO,POY,KNN
50774     141 super?   POY, 1 obs, gap before and after
50884     144 normal   KNN,POY
50894-903 139 super    KNN,POY
50952     152 normal   POY, 2 obs
51008     146 normal   POY, 1 obs
51018     151 normal?  POY, 3 obs, precursor?
51027-    140 super    POY,KNN

   The result basically confirms the comment:

>    The shortest measured intervals between superoutbursts 116 d, normal
> outbursts 11 d, respectively.  Normal outburst tend to occur with an
> interval of 22 d.  The values are one of the shortest known among usual
> SU UMa-type dwarf novae.

   The observations 50662 and 50774 supports the shorter, 11 d period.

   The epochs of superoutbursts are well expressed by

   JD.Max = 2449520 + 125.66 E

   E    JD     O-C
 -----------------
   0  2449514  -6
   3    49904   7
   4    50020  -3
   7    50400   0
   8    50527   2
   9    50662  11
  10    50774  -3
  11    50894  -8
  12    51027  -1

   The outburst parameters resemble those of YZ Cnc and WX Hyi.

Regards,
Taichi Kato

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