Abstract Title: *
Flux-stability analysis for the comparison stars for some quasars important to ICRF - GAIA CRF
link

Authors: *
Miljana D. Jovanović, Goran Damljanović and Oliver Vince

Institution: *
Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia

Preferred format: *
poster presentation

Abstract Text: *
The Gaia astrometric mission will provide a catalog of about 600,000 quasars and billion stars.
Some of these quasars could be the basis of a new optical reference frame. It is necessary to
observe a set of common quasars at both optical and radio wavelengths to link the ICRF (based
on the VLBI observations of quasars at radio wavelengths) with the future Gaia Celestial
Reference Frame - Gaia CRF (at optical wavelength). To establish this link only 10% of the
ICRF sources (about 70 sources) are suitable, and because of that this number has been
increased by 47 sources (out of the ICRF list) with high astrometric quality. Our observations of
47 candidate sources have been carried out by using three telescopes: two of them with
D=0.6m and D=1.4m are located at the Astronomical Station Vidojevica (of the Astronomical
Observatory of Belgrade) and the third one with D=2m is located at the Rozhen Observatory of
NAO BAS (Bulgaria). In this paper we present light curves of a few objects, together with their
comparison stars for the period from mid-2016 until now. Also, the results of the flux-stability
analysis for the comparison stars are presented here.