J/AJ/155/90 1996-2009 optical photometric monitoring for 3C 66A (Fan+, 2018)
Optical photometric monitoring for 3C 66A during 1996-2009 and its periodicity
analysis.
Fan J.H., Tao J., Liu Y., Yuan Y.H., Sawangwit U., Yang J.H., Huang Y.,
Zhang Y.T., Zhang J.Y., Zhang L.X., Zhu J.T.
<Astron. J., 155, 90 (2018)>
=2018AJ....155...90F 2018AJ....155...90F (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; Photometry, UBVRI
Keywords: BL Lacertae objects: individual (3C 66A) - galaxies: active -
galaxies: photometry
Abstract:
3C 66A is one of the most interesting blazars and one of our monitoring
objects carried out with the 1.56 m telescope at Sheshan station,
Shanghai Astronomical Observatory (ShAO). It has been monitored since
1996 December 11. In the present work, we show its optical light curves
during the period of 1996 December 11-2009 December 28. From our
observations, we found that the largest variations in the V, R, and I
bands are ΔV=1.840±0.065, ΔR=1.898±0.069 mag, and
ΔI=1.659±0.047 mag, respectively. Intra-day variabilities are
found in the three bands: in the V band, an A=17.7% brightness increase
over ΔT=47.5 minutes on JD 2455119, and an A=46.27% brightness
increase over ΔT=271.4 minutes on JD 2454816; in the R band, an
A=47.09% brightness increase over ΔT=23.18 minutes on JD 2454004,
and an A=38.11% brightness increase over ΔT=87.98 minutes on
JD 2453995; and in the I band, an A=13.2% brightness decrease over
ΔT=38.44 minutes on JD 2453995, and an A=92.8% brightness decrease
over ΔT=344.02 minutes on JD 2454818. For micro-variability,
we found that R variability leads I variability by 25.92±1.09 minutes.
When the periodicity analysis methods, with the red noise being considered,
are adopted to the V, R, and I observations, we can find that the
periodogram to the V data is consistent with red noise, except for 1
CLEANest peak corresponding to the timescale of 696.0±182.0 days,
those to the R data are 653.0±171.0 and 156.0±17.0 days; and those
to the I data are 801.0±207.0 and 156.0±15.0 days, respectively.
Description:
The present photometric observations were done with the 1.56 m telescope
at ShAO from 1996 December 11 to 2009 December 28. The observations
during the period of 1996 December-2002 August were obtained using a
liquid nitrogen-cooled CCD camera (1024x1024 pixels, 1 pixel=0.019 mm),
while those during the period of 2002-2009 August were obtained using
a new liquid nitrogen-cooled CCD camera (2048x2048 pixels, SITe CCD chip).
The filters, the seeing, and the data processing soft packages were
described in our previous work by Tao et al. (2004PASP..116..634T 2004PASP..116..634T).
For the observations of 3C 66A, we used integration times of 120 s
typically for I and R, and 240 s for V depending on sky conditions and
the brightness of the target.
Objects:
-------------------------------------------------------------
RA (ICRS) DE Designation(s)
-------------------------------------------------------------
02 22 39.61 +43 02 07.8 3C 66A = 7C 021929.69+424830.00
-------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 76 708 Observational data for 3C 66A
--------------------------------------------------------------------------------
See also:
J/A+AS/106/361 : CCD Photometry of BL Lac objects (Xie+ 1994)
J/A+AS/116/403 : VRI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)
J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.3 d JD-V ? V band observation Julian Date
13- 18 F6.3 mag Vmag [13.972/15.812]? Johnson V band magnitude
20- 24 F5.3 mag e_Vmag [0.005/0.071]? Uncertainty in Vmag
26- 37 F12.4 d JD-R ? R band observation Julian Date
39- 44 F6.3 mag Rmag [13.445/15.343]? Cousins R band magnitude
46- 50 F5.3 mag e_Rmag [0.009/0.197]? Uncertainty in Rmag
52- 63 F12.4 d JD-I I band observation Julian Date
65- 70 F6.3 mag Imag [13.036/14.695] Cousins I band magnitude
72- 76 F5.3 mag e_Imag [0.004/0.087] Uncertainty in Imag
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 18-Oct-2018