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Near-infrared photometry of the young open clusters NGC 1893 and Berkeley 86 *
A. Vallenari 1,
A. Richichi 2,
G. Carraro 3 and
L. Girardi 3
Received 23 March 1999 / Accepted 5 August 1999
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 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.
Key words: techniques: photometric Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: Berkeley 86 Galaxy: open clusters and associations: individual: NGC 1893 infrared: stars
Send offprint requests to: Antonella Vallenari (email@example.com)
Online publication: September 13, 1999