V-R transzformáció a sötéthez adaptálódott ill. nem adaptálódott szemhez...
Nóvagyanús
csillag a Kígyótartóban
Új változó
az NGC 4013-nél
VSNET térképek
Szupernóva honlapok
VSNET
Date: Sat, 7 Nov 1998 18:53:52 -0700
From: bas@lowell.edu (Brian Skiff)
Subject: [vsnet-chat 1448] Re: (fwd) S5 0716+71 chart (Poyner)
Below is the complete sequence for the S5 0716+71 field, as published by Villata et al. (1998 Astron. & Astrophys. Suppl. 130, 305). Star coordinates are from the GSC. The full paper, including charts, can be obtained on-line, starting at:
http://www.edpsciences.com/articles/astro/abs/1998/11/ads1482/ads1482.html
...where html, PDF, and PostScript files are linked.
Name
RA (2000) Dec
GSC V B-V
V-R
S5 0716+714 1 7 22 36.4
+71 22 49 4368-0870 10.99 0.55 0.36
S5 0716+714 2 7 21 33.3
+71 19 21 4368-1025 11.46 0.56 0.34
S5 0716+714 3 7 21 52.3
+71 18 18 4368-0930 12.43 0.61 0.37
S5 0716+714 4 7 22 18.0
+71 23 35 4368-0846 13.19 0.47 0.30
S5 0716+714 5 7 21 54.3
+71 19 21 4368-0899 13.55 0.60 0.37
S5 0716+714 6 7 22 12.6
+71 21 15 4368-1196 13.63 0.61 0.37
S5 0716+714 7 7 21 14.0
+71 17 10 4368-0975 13.74 0.81 0.42
S5 0716+714 8 7 22 28.2
+71 17 38 4368-1070 14.10 0.60 0.31
\Brian
Mint azt a hazai és külföldi észlelések
mutatják, kb. másfél év után ismét
halványodik a R coronae Borealis.
A R CrB térképe letölthetõ:
R CrB "a" térkép
R CrB "b" térkép
V-R transzformáció a sötéthez adaptálódott ill. nem adaptálódott szemhez...
From: aah@nofs.navy.mil
Date: Mon, 5 Oct 1998 21:09:42 -0700
To: vsnet-chat@kusastro.kyoto-u.ac.jp
Subject: [vsnet-chat 1356] Re: Graham E-region standards
Berto Monard asked about transformations from (V-R) to visual magnitudes.
I did some
calculations awhile back for Janet Mattei using the CIE response curves
for photopic
(bright adapted eye) and scotopic (dark adapted eye) eyes, along with
Johnson/Cousins
curves and the Gunn-Stryker spectrophotometric atlas. The results
were:
P = V -0.001 -0.066(B-V)
= V -0.010 -0.073(V-R)
S = V -0.006 +0.382(B-V)
= V +0.031 +0.448(V-R)
These relations are reasonably good for colors < 1.5.
Whose eyes are scotopic and whose are photopic? Beats me, and
I certainly don't want
to get into any arguments -- I'm not any kind of expert here.
The normally quoted
transformation is v = V +0.2(B-V), which falls inbetween these relations.
The main
point is that (B-V) and (V-R) both give similar transformations, and
so both should
be ok for determining visual magnitudes from photometric magnitudes/colors.
The (V-R)
fit is somewhat worse since you are extrapolating to the bluer visual
magnitudes (especially
the bluer dark adapted eye) rather than bracketing them, but R is certainly
easier to
measure with most amateur CCDs than is B.
Arne
