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Near-infrared photometry of the young open clusters NGC 1893 and Berkeley 86 by Vallenari, Antonella; Richichi, Andrea; Carraro, Giovanni; Girardi, Leo is a scholarly article available to read on EtoBox.

What is Near-infrared photometry of the young open clusters NGC 1893 and Berkeley 86 about?

We present photometry in the J and K near-infrared bands for two regions centered on the young open clusters NGC 1893 and Berkeley 86. We study 700 stars down to K = 17 in the field of NGC 1893, and about 2000 stars in the field of Berkeley 86 down to K$\sim$ 16.5, for which near-infrared photometry was insofar not available. Coupling J-K data with UBV photometry taken from literature, we produce reddening corrected colour-magnitude diagrams. We find that our data are consistent with previous determinations: the clusters are roughly coeval with an age between 4 and 6 million years. The mean reddening (measured as E(J-K)) values turn out to be 0.35 and 0.50 for NGC 1893 and Berkeley 86, respectively.Using colour-colour plots we discuss the presence of candidate pre-main sequence stars showing infrared excess. Candidates are found in both cluster regions, confirming the young age of these clusters.

Author

Vallenari, Antonella; Richichi, Andrea; Carraro, Giovanni; Girardi, Leo

Published

1999

Language

EN