J/AJ/143/108 B'V'R' photometry of the BL Lac object S5 0716+714 (Wu+, 2012)
Simultaneous B'V'R' monitoring of BL Lacertae object S5 0716+714 and detection
of inter-band time delay.
Wu J., Boettcher M., Zhou X., He X., Ma J., Jiang Z.
<Astron. J., 143, 108 (2012)>
=2012AJ....143..108W 2012AJ....143..108W
ADC_Keywords: BL Lac objects ; Photometry, UBVRI
Keywords: BL Lacertae objects: individual (S5 0716+714) - galaxies: active -
galaxies: photometry
Abstract:
We present the results of our optical monitoring of the BL Lac object
S5 0716+714 over seven nights in 2006 December. The monitoring was
carried out simultaneously at three optical wavelengths with a novel
photometric system. The object did not show large-amplitude internight
variations during this period. Intranight variations were observed on
four nights and probably on one more. Strong bluer-when-brighter
chromatism was detected on both intranight and internight timescales.
The intranight variation amplitude decreases in the wavelength
sequence of B', R', and V'. Cross-correlation analyses revealed
that the variability at the B' and V' bands leads that at the R'
band by about 30 minutes on one night.
Description:
The monitoring of S5 0716+714 was carried out at Xinglong Station of
the National Astronomical Observatories of China (NAOC) in 2006
December with a novel photometric system, which consists of a 60/90cm
Schmidt telescope, an objective prism, a CCD camera, and a multi-peak
interference filter (MPIF). The left three passbands of the MPIF are
close to the broadband B, V, and R, so we designate them as B', V',
and R' (differences between these two magnitude systems are irrelevant
for the results of our variability study presented here).
The monitoring covered the period from 2006 December 18 to 27 (from JD
2454088 to 2454097), with no observation on December 19, 25, and 26.
Objects:
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RA (2000) DE Designation(s)
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07 21 53.45 +71 20 36.4 S5 0716+714 = QSO B0716+714
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 99 1168 Observational log and results in the B', V',
and R' bands
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
J/ApJ/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)
J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)
J/AJ/136/1846 : BVRI light curves of S5 0716+714 (Zhang+, 2008)
J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008)
J/AJ/133/1599 : B'V'R' photometry of S5 0716+714 (Wu+, 2007)
J/A+A/466/63 : VLBI observations of BL Lac objects (Wu+, 2007)
J/AZh/83/310 : BV(RI)c photometry of S5 0716+714 (Amirkhanyan+, 2006)
J/A+A/451/435 : BV(RI)c photometry of S5 0716+714 (Montagni+, 2006)
J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)
J/AJ/129/1818 : Photometry of S5 0716+714 (Wu+, 2005)
J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)
J/ApJ/537/101 : Optical Study for blazars. I. (Fan+, 2000)
J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "YYYY/MM/DD" Obs.date Date of the Observation
12- 21 A10 "h:m:s" Obs.time Time of the Observation
23- 35 F13.5 d JD Julian Date of the Observation
37- 39 I3 s Exp Exposure time
41- 46 F6.3 mag Bmag [14.0/14.4] The B' band magnitude of
S5 0716+714
48- 52 F5.3 mag e_Bmag Uncertainty in Bmag
54- 59 F6.3 mag dBmag Differential B' band magnitude of star 6 (1)
61- 66 F6.3 mag Vmag [13.5/13.8] The V' band magnitude of
S5 0716+714
68- 72 F5.3 mag e_Vmag Uncertainty in Vmag
74- 79 F6.3 mag dVmag Differential V' band magnitude of star 6 (1)
81- 86 F6.3 mag Rmag [13.0/13.4] The R' band magnitude of
S5 0716+714
88- 92 F5.3 mag e_Rmag Uncertainty in Rmag
94- 99 F6.3 mag dRmag Differential R' band magnitude of star 6 (1)
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Note (1): Star 6 is slightly brighter than S5 0716+714 and was used as a
check star.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 05-Jun-2013