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Journal of Physical Studies 12(1), Article 1903 [4 pages] (2008)
DOI: https://doi.org/10.30970/jps.12.1903 CCD PHOTOMETRY IN THE UBVR SYSTEM IN THE REGION OF NGC 6913 CLUSTERV. Andruk1, G. Butenko2, L. Svachij1
1Main Astronomical Observatory, NAS of Ukraine |
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CCD observations of a sky area in the NGC 6913 cluster were made in the $UBV$ Johnson system with the two-meter telescope of the Terskol Peak Observatory, the Northern Caucasus, Russia. We derived magnitudes and positions for stars down to $V=20^m$ for a sky area of $7'{\times}5'$ arcmin. The instrumental photometric system is determined with respect to the $UBV$ Johnson system. From the observations, we obtained a new value of the distance module $V{-}M_{V}=13.8^m$ as well as the value the reddening $E (U{-}B)/E(B{-}V)=0.7/0.9$. The procedure for reducing CCD frames is briefly described which is realized in the LINUX/MIDAS/ROMAFOT on the basis of a new method of field elimination. The rms error is $\pm0.02^{m}-0.03^{m}$ for magnitude determination.
PACS number(s): 95.75.Mn, 95.85.Kr, 97.10.Zr, 98.20.Di