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In a recent paper on V1184 Tau, Semkov provides a UBVRI sequence for
the field. The text indicates these are based on five nights of observation
against 1992 Landolt standards. Below I show accurate coordinates for the
stars from the all-sky 2MASS catalogue, along with Semkov's data. He shows
UBVRI magnitudes, but I give them here as V and colors. I have omitted his
U-band data, since it was clear that the errors were large enough to make the
U-B colors meaningless. For each datum I show the nominal rms errors (errors
on colors taken in quadrature). The colors are reasonably consistent within
their stated uncertainties. I at first thought the anomalous V-I color of
star G resulted from a typo in the I magnitude (1 mag. too bright), but it is
consistent with that shown in USNO-B1.0 (I=13.39 versus mi=13.5 in B1.0).
Something odd may be going on with this one.
The BVR colors for all the stars are indicative of little or no
reddening. For V1184 Tau, I show approximate values for the magnitude and
colors.
\Brian
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source: 2003A&A...404..655S
SEMKOV E.H.
Astron. Astrophys., 404, 655-659 (2003)
Photometric and spectroscopic study of V1184 Tauri.
ID RA (J2000) Dec s V err B-V err V-R err V-I err
V1184 5 47 03.77 +21 00 34.8 M 15. 1.6 1.1 2.3
A 5 47 01.06 +20 58 33.5 M 13.26 0.02 0.64 0.04 0.38 0.02 0.77 0.03
B 5 47 01.16 +21 02 47.1 M 14.67 0.03 2.13 0.10 1.36 0.06 2.73 0.04
C 5 46 56.78 +20 59 51.3 M 15.03 0.02 0.77 0.04 0.48 0.02 0.93 0.04
D 5 47 15.18 +21 00 12.0 M 15.27 0.02 0.88 0.05 0.52 0.03 0.98 0.04
E 5 47 02.82 +21 00 50.3 M 15.88 0.03 0.84 0.06 0.49 0.04 0.97 0.04
F 5 47 07.85 +21 00 15.9 M 16.38 0.02 1.27 0.04 0.82 0.03 1.51 0.05
G 5 47 15.45 +20 59 30.0 M 16.49 0.03 1.67 0.09 0.93 0.05 3.10 0.07
H 5 46 54.24 +21 01 29.9 M 17.01 0.06 0.99 0.12 0.63 0.07 1.18 0.07
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