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J/A+AS/132/83 BVRI photometry of 7 BL Lac objects (Bai+ 1998)
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The intraday variability in the radio-selected and X-ray-selected BL Lac objects
Bai J.M, Xie G.Z., Li K.H., Zhang X., Liu W.W.
<Astron. Astrophys. Suppl. Ser. 132, 83 (1998)>
=1998A&AS..132...83B (SIMBAD/NED BibCode)
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ADC_Keywords: BL Lac objects ; Photometry, UBVRI
Keywords: BL Lacertae objects: general - galaxies: photometry
Abstract:
Seven BL Lac objects have been photometrically observed in an effort
to study the difference of optical intraday variability between the
radio-selected BL Lac objects (RBLs) and X-ray-selected BL Lac objects
(XBLs). The objects we observed are selected arbitrarily. They are
four RBLs, PKS 0735+178, PKS 0754+101, OJ 287 and BL Lac, and three
XBLs, H 0323+022, H 0548-322 and H 2154-304. During the observation
all of them exhibited microvariation, and H 0323+022 and H 0548-322
sometimes showed brightness oscillation. PKS 0735+178 and BL Lac were
in their faint states and not very active. It seems that RBLs do not
show microvariability more frequently than XBLs.
Objects:
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RA (2000) DE Designation(s)
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22 02 43.3 +42 16 40 BL Lac
03 26 13.8 +02 25 15 H 0323+022
05 50 41.5 -32 16 09 H 0548-322
21 58 51.9 -30 13 30 H 2154-304
08 54 48.9 +20 06 31 OJ 287 = PKS 0851+203
07 38 07.4 +17 42 19 PKS 0735+178
07 57 06.7 +09 56 35 PKS 0754+101
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 341 Photometric data of seven BL Lac objects
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 "DD/MM/YY" Date Observation date
10- 20 F11.3 d JD Julian Date
22- 26 F5.2 mag mag Magnitude
28- 30 F3.2 mag e_mag One sigma uncertainty on mag
33 A1 --- Band [BVRI] Filter used
37- 48 A12 --- Object Name of the object observed
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Acknowledgements: Bifang LIU <bfliu@public.km.yn.cn>
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(End) Patricia Bauer [CDS] 25-Jun-1998