Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..17h&link_type=abstract
Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech
Astronomy and Astrophysics
Astronomy
Scientific paper
Star clusters, especially compact ones (with diameter of few to ten arcmin), are suitable targets to search for light variability in a group of stars by means of an ordinary Cassegrain telescope plus CCD system. A special patrolling with short time-fixed exposures and mmag accuracy could be used also to study stellar oscillation for a group of stars simultaneously. The last can be carried out both separately from one site and within the WET(Whole-Earth Telescope) XCov campaigns. The detection of extra-solar planet transit events might be a by-product of a long-term monitoring of compact open clusters as well. We present the program of open star clusters monitoring with the Zeiss 1 meter RCC telescope of Maidanak observatory which has been recently automated. In combination with quite good seeing at this observatory (see, e.g., Sarazin, M. 1999, URL http://www.eso.org/gen-fac/pubs/astclim/) the automatic telescope, equipped with a large-format (2KX2K) CCD camera AP-10, will allow collecting homogeneous time-series for analysis. We already started this program in 2001 and had a set of patrol observations with a Zeiss 0.6 meter telescope and an AP-10 camera in 2003. Seven compact open clusters in the Milky Way (NGC 7801, King 1, King 13, King 8, King 20, Berkeley 55, IC 4996) have been monitored for stellar variability and some results of photometry will be presented. A few interesting variables were discovered and dozens for the moment are suspected of variability for the first time within our program. It is also shown how observations like these could feasibly be used for exo-planet searches. We have made steps to join the Whole-Earth Telescope effort in future campaigns for Asteroseismology.
Hojaev Alisher S.
Semakov D. G.
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