ONE-METER TELESCOPE IN KOLONICA SADDLE - 4 YEARS OF OPERATION

Анотація

The actual technical status of 1 meter
Vihorlat National Telescope (VNT) at Astronomical
Observatory at Kolonica Saddle is presented.
Cassegrain and Nasmyth focus, autoguiding system,
computer controlled focusing and fine movements and
other improvements achieved recently. For two channel
photoelectric photometer the system of channels
calibration based on artificial light source is described.
For CCD camera FLI PL1001E actually installed in
Cassegrain focus we presents transformation coefficients
from our instrumental to international photometric
BVRI system. The measurements were done
during regular observations when good photometry of
the constant field stars was available. Before FLI camera
acquisition we used SBIG ST9 camera. Transformation
coefficients for this instrument are presented as
well.
In the second part of the paper we presents results
of variable stars observations with 1 meter telescope
in recent four years. The first experimental electronic
measurements were done in 2006. Both with
CCD cameras and with two channel photoelectric
photometer. Starting in 2007 the regular observing
program is in operation. There are only few stars
suitable for two channel photoelectric photometer
observation. Generally the photometer is better when
fast brightness changes (time scale of seconds) must be
recorded. Thus the majority of observations is done
with CCD detectors. We presents an brief overview
of most important observing programs: long term
monitoring of selected intermediate polars, eclipse
observations of SW Sex stars. Occasional observing
campaigns were performed on several interesting
objects: OT J071126.0+440405, V603 Aql, V471 Tau
eclipse timings, Z And in outburst.