[vsnet-chat 2155] EV Aqr

["Bruce Sumner" <b.sumner@bom.gov.au>]

The lack of any past observations of this UGZ: variable, together 
with recent observations by Gary Poyner of a varying star near 
the nominal position of EV Aqr, imply that EV Aqr has been 
misidentified as a CV.

To assist observers monitor this variable, here is presented a 
comparison star sequence based on field photometry obtained by 
Arne Henden. The position given here for EV Aqr is of the varying 
red star star observed by Poyner. This star is identical with GSC 
0526-01562 and is the star identified by Tsesevich and Kazanasmas 
(1971) as EV Aqr. 

Kato [vsnet-id 86] mentions that the VSNET chart of EV Aqr (Nov 1995) 
gave V=13.57 for this star and marks it as var?. This magnitude 
appears to be accurate, as the magnitudes on the VSNET chart have 
negligible zero point offset when compared to the sequence presented 
here. Additionally the field photometry (three nights) used to derive 
this sequence also confirms that the star here identified as EV Aqr 
is indeed a red variable. It is quite possibly a SR variable.

Bruce Sumner

-------------------------------------------------------------------
     EV AQUARII   (?)   Range: 12.3-14v
     Position:   21 06 17.86  +00 52 44.3 (J2000, from .dat file)
     Magnitude:  V=12.444  B-V=1.483      (from .dat file)

ID    RA (2000)    DEC       X    Y   N    V      ERR    B-V    ERR 
    
1   21 06 20.0  +00 50 59    31 -105  3  12.439  0.017   0.790  0.012 
2   21 06 06.3  +00 48 19  -174 -265  3  12.629  0.026   0.603  0.016 
3   21 06 27.1  +00 55 50   138  186  3  13.064  0.013   1.135  0.006 
4   21 06 39.2  +00 54 09   320   85  3  13.309  0.020   0.713  0.007 
5   21 06 14.4  +00 55 19   -52  155  3  14.040  0.020   0.690  0.012 
6   21 06 10.8  +00 52 04  -106  -40  3  14.479  0.019   0.732  0.018 
7   21 06 15.8  +00 54 02   -32   78  3  15.209  0.022   0.802  0.013 
8   21 06 12.4  +00 52 56   -83   12  3  15.909  0.020   0.834  0.017 
9   21 06 17.4  +00 51 43    -7  -61  3  16.227  0.084   0.952  0.015 
10  21 06 17.2  +00 53 11   -10   27  3  16.268  0.000   1.148  0.004 
11  21 06 20.1  +00 52 51    33    7  3  17.042  0.023   0.959  0.009

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