[vsnet-chat 3410] AB Nor - Comparison Sequence

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

172. AB NORMAE   (UGSU)   Range: 13.9 - ~20p
     Position:   15 49 15.48  -43 04 48.6  (J2000)
             
ID      RA  (2000)   DEC       X    Y   N     V   visual  RASNZ 
                                                    mag
1    15 49 11.7  -43 07 03   -42 -134   1   10.95   109     a 
2    15 49 24.5  -43 05 37    98  -48   1   11.11   111     b
3    15 49 09.4  -43 03 51   -67  -58   1   11.34   114     c
4    15 49 07.8  -43 05 01   -84  -12   1   12.14   122     e
5    15 49 34.5  -43 05 55   199  -66   1   12.59   126 
6    15 49 31.1  -43 07 09   171 -139   1   12.96   130   
7    15 49 14.1  -43 01 51   -15  178   1   13.28   133     f
8    15 49 17.5  -43 04 57    22   -8   1   13.74   137     m
9    15 49 15.0  -43 03 21    -6   88   1   13.83   138     k 
10   15 49 18.3  -43 02 24    31  145   1   14.17   142     g      
11   15 49 12.8  -43 02 44   -29  123   1   14.44   144     h      
12   15 49 17.8  -43 05 43   -84  -54   1   14.66   147
13   15 49 08.5  -43 06 09   -76  -79   1   15.06   151             
14   15 49 20.7  -43 03 16    58   93   1   15.50   155     o      

Notes:

1. Errors are estimated to be < +/- 0.05 magnitude. The coordinates 
for AB Nor are from an outburst image obtained by Stan Walker.
The coordinates of the sequence stars are from UCAC1. The final 
magnitudes for visual observers are given in the last column. The 
magnitudes for stars 3 and 4 are modified slightly to fall in line 
with Vogt's magnitudes, as given below.

2. This single night V(CCD) sequence has been obtained by 
calibration against four V(PEP) magnitudes from Vogt, Publ. VSS 
RASNZ, No. 5, (C77), 1977, as follows:
                         Walker         Vogt
                           V           V    B-V
                         10.95       10.90  0.64
                         11.34       11.39  1.58
                         12.14       12.15  1.39
                         13.74       13.70  0.67

3. Ten stars in this sequence are marked by letter on the RASNZ 
chart for this variable, dated 30 June 1976. The letters are given 
in the column titled RASNZ in the above table. Two faint stars in 
the RASNZ sequence were too faint for accurate magnitudes to be 
derived, but approximate V magnitudes for these two faint stars 
have been obtained, with the following results -

                        l = 15.7
                        n = 15.6

4. Thanks to Stan Walker for obtaining the V image from which this 
sequence has been derived.

Bruce Sumner
11 July 2000

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