[vsnet-chat 4462] GU Sgr sequence

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

I have a few comments regarding the Bouma/van Dijk chart for 
GU Sgr [vsnet-chat 4457]. I agree with Arne's comment that star 
#18 V=16.9 is contaminated by neighbours, and I therefore drop it 
from the sequence. For similar reasons I also drop stars #15, #16 
and #17. To replace these stars I had to find other stars in the 
range 15.7-16.9. Two good stars are the Bouma/van Dijk stars 15.7 
and 16.2 to the south of the variable. Their 16.5 appears crowded, 
and I have decided not to use it. I have however used a close by 
star with V=16.9. The final revised sequence, which I believe 
covers all of Bouma/van Dijk's concerns, follows. It should also be 
noted that to extend the sequence at the bright end there are five 
photoelectric measures between V=10.09 to V=11.27 obtained in 1972 by 
Bateson, Gordon and Menzies, for which I will provide details later.

Bruce Sumner
-------------------------------------------------------------------
44   GU SAGITTARII   (RCB)   Range: 10.3-16.6V
     Position:   18 24 15.58  -24 15 25.2   (J2000, from .dat file)
     Magnitude:  V=10.344  B-V=1.111        (.dat file)

ID   RA  (2000)   DEC       X    Y   N    V      ERR    B-V    ERR  

1  18 24 01.7  -24 15 46  -190  -21  3  11.338  0.044  0.902  0.023  
2  18 24 31.2  -24 12 06   214  199  2  11.396  0.041  0.428  0.040  
3  18 23 58.5  -24 12 58  -234  147  2  12.139  0.034  1.365  0.008  
4  18 23 59.3  -24 11 20  -223  245  2  12.203  0.045  0.847  0.035  
5  18 24 21.2  -24 15 32    76   -7  2  12.428  0.031  0.676  0.018  
6  18 23 57.9  -24 14 27  -242   58  3  12.716  0.029  1.323  0.026  
7  18 24 12.0  -24 12 49   -49  156  4  13.304  0.010  1.652  0.017  
8  18 24 01.1  -24 16 15  -198  -50  3  13.592  0.021  0.710  0.013  
9  18 24 07.1  -24 14 53  -117   32  4  13.690  0.015  0.429  0.018  
10 18 24 05.1  -24 15 06  -143   19  4  13.882  0.031  1.415  0.036  
11 18 24 19.2  -24 16 09    49  -44  2  14.236  0.014  0.776  0.008 
12 18 24 20.6  -24 15 50    68  -25  2  14.573  0.012  1.548  0.008 
13 18 24 19.3  -24 14 53    50   32  2  14.892  0.019  0.607  0.011 
14 18 24 18.0  -24 14 58    33   27  2  15.186  0.008  1.146  0.008 
15 18 24 17.4  -24 16 08    25  -43  2  15.729  0.048  1.077  0.035 
16 18 24 15.0  -24 16 20    -9  -55  2  16.159  0.008  1.286  0.023 
17 18 24 15.8  -24 16 07     2  -42  2  16.885  0.011  1.224  0.045 

B. Sumner
21 May 2001

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp