J/A+AS/114/337 CCD photometric observations of blazars (Jia Guibin+, 1995)
CCD photometric observations of blazars
Jia Guibin, Ma Huiyu, Cen Xuefen, Zhili L., Shengquan L., Guanghua L.
<Astron. Astrophys. Suppl. Ser. 114, 337 (1995)>
=1995A&AS..114..337G 1995A&AS..114..337G (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; QSOs
Keywords: BL Lacertae objects - quasars
Description:
The results of both BVRI CCD photometric monitoring and fast
photometry in a certain optical waveband for 4 blazar objects and
variable quasar are presented. The results show that 1) 3C 120 has a
short time scale variability about 20 minutes, with the different
shape of light curve and with different amplitude (one is
0.21±0.06mag, the other is 0.053±0.014mag) in different night. One
day timescale variability was also observed, with a maximum decrease
of the flux near 20%. 2) OJ 287 has a variability on a timescale of
one day, with the maximum amplitude of changes about 0.2mag. Since
1990, the source brightened near 0.8mag. 3) 3C 345 is fainter during
observing periods, the faintest magnitude B∼17.5 mag it seems variable
from night to night. 4) The variability with a small amplitude about
0.1mag appear on a timescale of about 10 months in the data of PHL
658. The values of the colour index of the blazars in each night are
given.
Objects concerned:
------------------------------
RA (2000) DE Name
------------------------------
08 54 48.9 +20 06 31 OJ 287
04 33 11.1 +05 21 15 3C 120
16 42 58.8 +39 48 37 3C 345
00 05 59.1 +16 09 48 PHL 658
------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 41 519 Observed results for blazars
table2 92 28 Average colour indices and average
magnitudes of blazars
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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2- 8 A7 --- Name Object name
9- 16 A8 "MM/DD/YY" Date Date of observation
18- 28 F11.3 d JD Julian day
30- 34 F5.2 mag Mag Magnitude
36- 39 F4.2 mag e_Mag Error on the magnitude
41 A1 --- Band [BVRI] Observed waveband
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Object name
8- 15 A8 "MM/DD/YY" Date Date of observation
17- 20 F4.2 mag <B-V> []? <B-V> average of colour indices
22- 25 F4.2 mag e_<B-V> []? Error on <B-V>
27- 30 F4.2 mag <V-R> []? <V-R> average of colour indices
32- 35 F4.2 mag e_<V-R> []? Error on <V-R>
37- 40 F4.2 mag <R-I> []? <R-I> average of colour indices
42- 45 F4.2 mag e_<R-I> []? Error on <R-I>
48 I1 --- Ncol []? Number of observed colour indices
50- 54 F5.2 mag <Bmag> []? Average of B magnitude
56- 59 F4.2 mag e_<Bmag> []? Error on
61- 65 F5.2 mag <Vmag> []? Average of V magnitude
67- 70 F4.2 mag e_<Vmag> []? Error on
72- 76 F5.2 mag <Rmag> []? Average of R magnitude
78- 81 F4.2 mag e_<Rmag> []? Error on
83- 87 F5.2 mag <Imag> []? Average of I magnitude
89- 92 F4.2 mag e_<Imag> []? Error on
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(End) Simona Mei [CDS] 07-Jun-1995