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[vsnet-obs 2633] VS Obs Apr 17/18 (CR Boo)



Variable Star Observations for April 17th/18th 1996
Gary Poyner
Birmingham
England
E-mail gp@star.sr.bham.ac.uk 
TA/BAA Recurrent Objects Programme:
http://vsnet.demon.co.uk/astronomer
  
40cm, 22cm reflectors & 10x5oB
Cloud eventually!
 
Star             UT            Mag
---------------------------------------
3C 273    Apr  17.917          12.7
3C 279         17.918         <15.0
3C 371         18.017          15.5
Aql V1413      18.071          11.1
Aur FS         17.880         <14.6
Aur SS         17.879          14.8
Boo CR         18.001          13.9   Outburst? See below
Boo TT         17.922         <14.8
Boo UZ         17.921         <14.4
Cam AF         17.884         <15.1
Cam BY         17.881          14.7
Cam Z          17.910          12.5
Cas DK         17.871         <13.1
Cas GX         17.870         <12.4
Cas HT         17.869         <12.7
Cas N95        17.866           9.0
Cas UV         17.868          10.7
Cas V452       17.874         <13.4
Cas V630       17.872         <12.7
CMi AQ         17.892         <14.2
Cnc AK         17.897         <15.3
Cnc AT         17.894          13.2   Outburst
Cnc DE         17.895         <14.7
Cnc EG         17.896         <15.2
Cnc SY         17.893          11.9
Cnc YZ         17.892          13.4
Com AL         17.903         <15.5
Com GO         17.904         <14.9
Com W          17.905          14.6
CrB R          17.923          12.5
CrB T          17.924          10.1
CrB V          18.002           8.7
CrB W          18.002           9.8
CVn TX         17.889          10.1
Cyg BF         18.081          11.6
Cyg CH         18.040           9.3
Cyg Chi        18.065          11.2
Cyg CI         18.063          11.0
Cyg EY         18.065          14.8
Cyg Scovil     18.060         <14.8
Cyg SS         18.085          12.5
Cyg V1016      18.074          10.8
Cyg V1028      18.058         <15.0
Cyg V1113      18.056         <15.0
Cyg V1316      18.076         <15.3
Cyg V1329      18.072          13.6
Cyg V1330      18.073         <14.7
Cyg V1363      18.062         <14.9
Cyg V1454      18.063         <13.9
Cyg V1974      18.039          15.1:
Cyg V337       18.078         <13.7
Cyg V404       18.060         <14.8
Cyg V482       18.061          10.9
Cyg V542       18.057         <15.4
Cyg V795       18.079         <14.4
Dra AB         17.885          13.0   Outburst
Dra AG         17.885           9.5
Dra DO         17.912          14.9  
Dra DV         18.015         <15.5
GD552          17.887         <12.1
Gem AW         17.878         <15.2
Gem CI         17.874         <14.5
Gem IR         17.876         <14.5
Gem SY         17.877         <14.1
Gem U          17.878          14.4
Her AH         18.007          12.0   Outburst
Her AM         18.013          13.7
Her DQ         18.015          14.3
Her HZ         18.008          13.0
Her V443       18.009          12.1
Her V589       18.010         <15.1
Her V592       18.012         <15.3
Her YY         18.008          13.1
HS1804+6753    18.019          15.8:  In eclipse?
Leo RZ         17.898         <15.0
Leo T          17.899         <15.3
Leo X          17.897          12.3   Outburst
LMi RU         17.900         <15.1
LMi RZ         17.899         <14.1
LMi SS         17.902         <14.8
LMi ST         17.901         <15.1
LMi SX         17.901         <14.4
Lyr AY         18.021          14.7   fading
Lyr DM         18.022         <14.8
Lyr HR         18.022         <15.0
Lyr MV         18.028          15.8
Lyr V344       18.024          15.1   fading
Lyr V358       18.031         <13.9
Lyr V419       18.023         <14.4
Lyr V493       18.030         <15.1
Mark 421       17.890          13.2
Mon V651       17.892          11.0
NGC 4151       17.888          11.6
NSV 786        17.888         <14.2
OJ 287         17.894          14.3
Per DY         17.883          11.6
Per GK         17.865          12.0
Per TZ         17.883         <13.2
Per UV         17.881         <12.8
Per UW         17.882         <12.6
PG1510+234     18.005          15.4   
PG1633+115     18.006         <14.6
S10932         17.906         <14.9
Ser LX         18.003          15.4
Ser R          18.003           7.3
Sge SV         18.069          10.6
TAV0033+59     17.869          10.7
UMa BC         17.890         <15.3
UMa BZ         17.908         <15.4
UMa CH         17.910          14.9
UMa CY         17.891         <14.8
UMa DI         17.908          15.3   Outburst
UMa DV         17.914         <15.2
UMa ER         17.867          13.1
UMa SU         17.909          13.9
UMa SW         17.867          10.5
UMa SW         18.001          10.7
UMa SW         18.056          10.5
UMi SS         18.019         <15.0
UMi Z          17.886          14.1
Vir HV         17.919         <14.9

CR Boo:
I have observed many "outbursts" in this star over the years, but I
am unable to find an accurate classification of it's type.  The TA
chart I use has it noted as type AM? (which is clearly in error).
In MVS June 1994, W. Wenzel has produced a short paper on CR Boo,
stating that it is a member of a helium white dwarf binary system, 
which mimics a dwarf nova with frequent outbursts.  Can anyone shed
more light on this interesting star?


End