Károly Szatmáry and László Kiss
I. Instrumentation
Szeged Observatory has
been controlled by the Department of Experimental Physics of the University
of Szeged (earlier József Attila University, JATE) and the Szeged Observatory
Foundation since 1992 in cooperation with a few members of the Department
of Optics and Quantumelectronics working in similar research fields. Many
students are involved into astronomical observations.
The main instrument is
a 40 cm Cassegrain telescope equipped with an Optec SSP-5A photoelectric
photometer which is supplied with standard UBV and uvby filters or with
an SBIG ST-9E CCD camera. A smaller instrument (6.3 cm refracting telescope)
with an ST-4 CCD is used for special student works for obtaining digitized
images of various faint deep-sky objects. We purchased a Celestron-11 28
cm Schmidt-Cassegrain telescope in 1995. It is equipped with an ST-6 CCD
camera which is used for astronomical imaging and photometry using standard
UBVRI filters. This telescope deals mostly with the educational work, thus
it has been installed in the inner part of the city. A 20 cm Newtonian
telescope was bought in order to improve our popularizing work.
II. Research
The basic research field
is related to the variable stars, especially to pulsating and eclipsing
variables. We use long-term (as long as 40-80 years) data series taken
from various international databases compiled by AFOEV, VSOLJ, HAA/VSS,
AAVSO, BAA/VSS for studying long-period pulsating variables. Short period
pulsators and eclipsing binaries are observed photometrically using the
observatory's 40 cm telescope.
In order to describe
and model the long-term data series, we applied the very efficient wavelet
analysis beyond the traditional Fourier-analyis. The dramatic amplitude
decrease in semiregular variable V Boo was succesfully described by the
wavelet analysis, while the rapid period decrease in T UMi was explained
as an observable effect of the helium shell flash. We have improved the
ephemerides of 40 mira variables searching for very long-term period changes.
Pulsational modes of
TX Dra were identified and fundamental physical parameters (such as mass,
radius and luminosity) were calculated with a complex light curve analysis.
We have discussed the light variation of 89 Her which was observed spectroscopically
by us at David Dunlap Observatory (Toronto, CA). Recently we studied general
properties of 110 semiregular stars.
We have modelled the
cyclic O-C diagrams of BE Lyn (high amplitude delta Scuti variable) and
TU UMa (RR Lyrae type) as results of the light-time effect in binary systems.
The basic properties of the assumed secondary components were calculated
(e.g. mass, luminosity, orbital elements).
The light variation of
the small amplitude delta Scuti star iota Boo was demonstrated by the most
precise photometric measurements so far carried out at Szeged Observatory
and Sierra Nevada Observatory (Spain).
We have observed nineteen
Cepheids simultaneously in the UBV and uvby photometric systems. Reddenings
caused by the interstellar dust, effective temperatures and surface gravities
were determined using these photometric data and the most recent theoretical
calculations in the literature. This project was extended at Sierra Nevada
Observatory by observing 23 fainter Cepheids with the 90 cm telescope equipped
with a four-channel Strömgren-photometer.
High resolution spectroscopy
of Type I and Type II Cepheids was carried out using the 1.88 m telescope
of David Dunlap Observatory (DDO). We have studied the effect of the velocity
gradient in pulsating atmospheres on the observed radial velocity curves.
Continuous photometry
of the W UMa-type eclipsing binary VW Cep was used for studying the period
variation and the slowly changing surface activity. The latter was discussed
with high resolution spectroscopy conducted at DDO.
We joined the international
observing campaign of the long-period (1100 days) eclipsing binary OW Gem.
The main aim was to determine the exact shape of the light curve around
the primary minimum. We started the multicolour photometric study of galactic
open clusters in 1995. In the following years different observing runs
were carried out at Calar Alto Observatory (Spain).
Photometric CCD observations
of comets and rapidly rotating non-spherical minor planets were conducted
with the 60/90/180 cm Schmidt telescope at Piszkéstetô Station of the Konkoly
Observatory.
We attended several international
conferences (Brussels, Wien, Visegrád, Baja, Hague, Cape Town, Sion, Los
Alamos, Victoria, Kyoto, Montpellier, Leuven, Porto, Budapest, Christchurch,
Sydney) during 1990-2003.
Our work has been supported
by OTKA Grants T4330, F7318, T7522, T22249, T22259, T32258, T34615, T42509,
F43203, MKM K+F Grant 96/593, OM FKFP 0010/2001 and KOMA Grants 96/I/1370,
97/VII/X145.
III. Education and popularization
Regular astronomical teaching
is given for students of physics during the fourth year of studies. They
get aquired with the photoelectric and CCD photometry in a special laboratory
excercise. We announce various special courses every year (Archeoastronomy,
Astrophysics, Modern Astronomy, Solar System, Digital Image Processing,
Variable Stars), which are very popular among the students. We train astronomers
starting from the academic year of 1999/2000 in cooperation with the Department
of Astronomy of Eötvös Loránd University and Konkoly Observatory.
Szeged Observatory is
open for the public every Friday while there is an open hour for the members
of the Hungarian Astronomical Association every Tuesday.
The observatory's URL
is: http://astro.u-szeged.hu
where one can find our
publications and many other astronomical information.