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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…