J/PAZh/25/893 Optical outbursts of the blazar 3C 345 (Belokon+, 1999)
Spectral slope of the emission in "fast" and "slow" optical outbursts
of the blazar 3C 345.
Belokon E.T., Babadzhanyants M.K.
<Pis'ma Astron. Zh. 25, 893 (1999)>
=1999PAZh...25..893B 1999PAZh...25..893B
=1999AstL...25..781B 1999AstL...25..781B
ADC_Keywords: QSOs ; Photometry, UBV ; Photometry, photographic
Abstract:
We present photographic UBV photometry of the blazar 3C 345 that were
made during 79 nights in 1971-1974 and 1983-1984 as a part of the
Petersburg Quasar Monitoring Program (PQMP) carried out at the
Astronomical Institute of the St.-Petersburg University. These data
were previously published by piecemeal (references are presented in
Section 4). Now after partial revision these data are united in Table
1 that presents nightly averaged UBV magnitudes together with its rms
errors (see Section 4 of the paper for the details). These data were
used for the comparison of the spectral indices of the emission in the
"fast" (time scales of nearly 10-20 days) and "slow" (time scales of
nearly 1 yeas) outbursts in 3C 345.
Object:
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RA (2000) DE Designation
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16 42 58.9 +39 48 37 3C 345 = B2 1641+39 = DA 420 = 1ES 1641+399
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 79 Photographic UBV photometry 3C 345
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Byte-by-byte Description of files: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 "DD/MM/YY" Date Observation date
11-20 F10.2 d JD [2441073/2445439] Julian date
23-27 F5.2 mag Umag ? U magnitude (1)
30-33 F4.2 mag e_Umag ? Standard error in Umag (2)
36-40 F5.2 mag Bmag ? B magnitude (1)
43-46 F4.2 mag e_Bmag ? Standard error in Umag (2)
49-53 F5.2 mag Vmag ? V magnitude (1)
56-59 F4.2 mag e_Vmag ? Standard error in Umag (2)
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Note (1): The magnitude estimates in U, B, V bands.
If there were several magnitude estimates during a night,
then their mean is given;
Note (2): rms errors calculated from the typical errors for the single
estimation (0.07mag for B and V; 0.10mag for U) and then the number
of the estimates were averaged.
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(End) Veta Avedisova [INASAN] 05-May-2000