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astro-ph2008★ 5 cited
Optical monitoring of the z=4.40 quasar Q 2203+292
E. P. Ovcharov, P. L. Nedialkov, A. T. Valcheva +5
We report Cousins R-band monitoring of the high-redshift (z=4.40) radio quiet quasar Q 2203+292 from May 1999 to October 2007. The quasar shows maximum peak-to-peak light curve amp…
astro-ph2007
Variable stars in the field of open cluster NGC 6939
G. Maciejewski, Ts. Georgiev, A. Niedzielski
The results of CCD photometric survey performed with the 90/180 cm Schmidt-Cassegrain Telescope of the Nicolaus Copernicus University Astronomical Observatory in Piwnice (Poland) a…
astro-ph2004
BVR photometry of the resolved dwarf galaxy Ho IX
Tsvetan B. Georgiev, Dominik J. Bomans
We present BVR CCD photometry down to limiting magnitude B=23.5 mag for 232 starlike objects and 11 diffuse objects in a 5.4' x 5.4' field of Ho IX. The galaxy is a gas-rich irregu…