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[vsnet-sequence 6] Re: V2400 Oph sequence (Sumner/Henden)
Dear Bruce and interested readers,
last night I had a look at my sequence brew for V2400 Oph and compared it to yours. This is a rather easy field to allocate reference stars and we have derived a similar set.
Two main differences though and I dare to push my preference here:
1. I would definitely include the star 13.42 (0.71) 2' E of V. It is not just closer to V2400 but also more blue than No 4 in your list.
2. Star 15.01 (0.51), located at 171252-241232, is a bit further away from V than your No 9 but it is defintely blue-white and not red like No 9.
It must be expected that if V2400 Oph fades slightly it will still be blue-hot.
That was my promised feed-back on the sequence.
Kind regards,
Berto
>>> Taichi Kato <tkato@kusastro.kyoto-u.ac.jp> 07/13/00 08:25AM >>>
V2400 Oph sequence (Sumner/Henden)
Subject: [vsnet-chat 3418] V2400 Oph - comparison sequence
For Berto, here is the sequence for V2400 Oph, derived from Arne's
recent field photometry. As Arne noted, this is a crowded field, and
I had to be careful to select stars that were not affected by close
neighbours. The field is also quite red, and I had to include two
stars, namely 9 and 10, that are really too red to be included in a
normal sequence, but because of their proximity to the variable, and
because there were no other suitable stars near these magnitudes, I
had to include them in this sequnce. Do use them with care.
Bruce Sumner
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173. V2400 OPHIUCHI Range: ? - 14.5V Type: DQ
Position: 17 12 36.41 -24 14 44.7 (J2000, from .dat file)
Magnitude: V=14.470 B-V=0.326 (in .dat file)
ID RA (2000) DEC X Y N V ERR B-V ERR
1 17 12 43.5 -24 13 28 97 77 3 11.192 0.058 0.351 0.041
2 17 12 53.8 -24 09 00 238 345 3 12.158 0.014 0.826 0.008
3 17 12 40.0 -24 19 16 49 -271 3 12.841 0.000 0.691 0.006
4 17 13 03.1 -24 20 11 364 -326 2 13.455 0.006 0.845 0.000
5 17 12 27.2 -24 13 33 -126 72 3 13.725 0.006 0.665 0.002
6 17 12 30.5 -24 12 16 -80 149 3 14.034 0.000 0.843 0.006
7 17 12 37.9 -24 13 07 21 98 3 14.637 0.006 0.907 0.009
8 17 12 37.0 -24 13 50 8 55 3 14.776 0.008 0.915 0.010
9 17 12 36.3 -24 15 44 -2 -59 3 15.403 0.009 1.645 0.004
10 17 12 37.4 -24 15 16 13 -31 3 15.721 0.029 1.510 0.005
11 17 12 34.5 -24 14 31 -26 14 3 16.192 0.019 1.059 0.003
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