J/AJ/133/1599 B'V'R' photometry of S5 0716+714 (Wu+, 2007)
Optical monitoring of BL Lacertae object S5 0716+714 with a novel multipeak
interference filter.
Wu J., Zhou X., Ma J., Wu Z., Jiang Z., Chen J.
<Astron. J., 133, 1599-1608 (2007)>
=2007AJ....133.1599W 2007AJ....133.1599W
ADC_Keywords: BL Lac objects ; Photometry, CCD
Keywords: BL Lacertae objects: individual (S5 0716+714) - galaxies: active -
galaxies: photometry
Abstract:
We first introduce a novel photometric system that consists of a
Schmidt telescope, an objective prism, a CCD camera, and, in
particular, a multipeak interference filter. The multipeak
interference filter enables light in multiple passbands to pass
through it simultaneously. The light in different passbands is
differentially refracted by the objective prism and is focused on the
CCD in separate regions, so we have multiple "images" for each object
on the CCD frames. This system enables us to monitor blazars exactly
simultaneously in multiple wave bands on a single telescope and to
accurately trace the color change during the variation. We used this
novel system to monitor the BL Lacertae object S5 0716+714 during 2006
January and February and achieved a very high temporal resolution. The
object was very bright and very active during this period. Two strong
flares were observed, with variation amplitudes of about 0.8 and
0.6mag in the V' band, respectively.
Description:
The new photometric system consists of a Schmidt telescope, an
objective prism, a CCD camera, and a multipeak interference filter.
The Schmidt telescope is 60/90cm in diameter and is located at the
Xinglong Station of the National Astronomical Observatories of China.
We monitored S5 0716+714 with this system in 2006 January and
February.
Objects:
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RA (2000) DE Designation(s)
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07 21 53.4 +71 20 36 S5 0716+714 = 8C 0716+714
07 21 52.2 +71 18 17 Star 3 = [VRL98] S5 0716+71 3
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 97 1815 Observational log and results in the B', V'
and R' bands
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See also:
J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)
J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)
J/AJ/129/1818 : Photometry of S5 0716+714 (Wu+, 2005)
J/A+A/451/435 : BV(RI)c photometry of S5 0716+714 (Montagni+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "YYYY/MM/DD" Obs.date UT date of the observation
12- 19 A8 "h:m:s" Obs.time UT time of the observation (hh:mm:ss)
21- 33 F13.5 d JD Julian Date of the observation
35- 37 I3 s Exp Exposure time
39- 44 F6.3 mag B'mag The B' band magnitude (3) (1)
46- 50 F5.3 mag e_B'mag Error in B'mag
52- 57 F6.3 mag dB'mag Reference star's B' band
differential magnitude (2)
59- 64 F6.3 mag V'mag The V' band magnitude (3)
66- 70 F5.3 mag e_V'mag Error in V'mag
72- 77 F6.3 mag dV'mag Reference star's V' band
differential magnitude (2)
79- 84 F6.3 mag R'mag The R' band magnitude (3)
86- 90 F5.3 mag e_R'mag Error in R'mag
92- 97 F6.3 mag dR'mag Reference star's R' band
differential magnitude (2)
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Note (1): The B' band data have large errors and should be used
with great caution.
Note (2): The differential magnitude of reference stars is defined as the
magnitude difference (nightly mean set to 0) between star 3 ([VRL98]
S5 0716+71 3 ) and the average of the first four. It can be taken as
a measure of the accuracy of the observations.
Note (3): Parameters of the Left Three Passbands of the Filter
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PassBand Wavelength(A) Max.Trans(%) FWHM(A)
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B' 4575.2 59.40 355
V' 5672.9 88.28 210
R' 6786.6 58.34 162
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 19-Feb-2009