SIMBAD references

2009MNRAS.398..832K - Mon. Not. R. Astron. Soc., 398, 832-840 (2009/September-2)

Optical R-band variability of seven X-ray-selected BL Lacertae objects.


Abstract (from CDS):

This paper presents the results of optical CCD photometry in the Cousins R band for seven X-ray-selected BL Lacertae objects. Observations have been performed with the 70-cm meniscus telescope of Abastumani Astrophysical Observatory, Georgia. The data obtained provide important information on sources that have been rarely observed in the optical band. The targets show clear long-term variability with time-scales of 1.5-5 yr. The maximum amplitudes are slightly greater than 1 mag. 1ES 0323+022, 0502+675 and 0806+524 show clear non-periodical behaviour. 1ES 1028+511 changes quasi-periodically but further monitoring for periodicity confirmation and period derivation is needed. Overall brightness variation is maximal for 1ES 0647+250 with ΔR = 1.29 mag. Two-peak maxima, indicating the existence of reverse shocks in blazar jets, are observed for 1ES 0502+675, 0647+250, 0806+524 and 1517+656. The targets do not show intra-night variability. Day-to-day changes with amplitudes of 0.1-0.32 mag coincide mainly with short-term bursts. The latter are seen at faint (quiet) stages as during flaring activities. This fact leads to the suggestion that both hot-spot and shock-in-jet models explaining the origin of short-term bursts should be reasonable.

Abstract Copyright: © 2009 The Author. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: active - BL Lacertae objects: general - galaxies: photometry

CDS comments: In Table 2 : reference stars not in Simbad, In Introduction : A0 0235+64 is a misprint for A0 0235+164.

Simbad objects: 11

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