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Age determinations of the open star clusters King 14 and NGC 146
Valentin Kopchev, Petko Nedialkov, Georgy Petrov
We based on 2MASS J and Ks photometry for the open star clusters King 14 and NGC 146, and using color magnitude diagrams with isochrones fit we have found an age of log(age) = 7.8…
Age determination of possible binary open clusters NGC 2383/NGC 2384 and Pismis 6/Pismis 8
Valentin Kopchev, Petko Nedialkov, Georgy Petrov
Based on 2MASS J and Ks photometry for the open star clusters NGC 2383, NGC 2384,Pismis 6, Pismis 8 and using color magnitude diagrams with isochrones fit, we found an age of $\log…
BV photometry of a possible open star cluster pair NGC 7031/NGC 7086
Valentin Kopchev, Georgy Petrov
We present a CCD BV photometry of the possible binary open star cluster NGC 7031/NGC 7086. The aim is to confirm or disprove their common nature on the grounds of their age and dis…
Multicolour Optical Surface Brightness Profiles Decomposition of the Seyfert Galaxies III Zw 2, Mrk 506 and Mrk 509
L. Slavcheva-Mihova, B. Mihov, G. Petrov +1
We present the results of the UBVRcIc surface brightness profiles decomposition of the Seyfert galaxies III Zw 2, Mrk 506 and Mrk 509. The profiles were modelled as a sum of a Gaus…