Near-infrared photometry of the young open clusters NGC 1893 and Berkeley 86

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dc.creatorVallenari, Antonella
dc.creatorRichichi, Andrea
dc.creatorCarraro, Giovanni
dc.creatorGirardi, Leo
dc.date1999-09-03
dc.date.accessioned2026-07-07T02:33:04Z
dc.date.available2026-07-07T02:33:04Z
dc.descriptionWe 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.
dc.description9 pages, 12 figures, Astronomy & Astrophysics Main Journal Accepted
dc.identifierhttps://arxiv.org/abs/astro-ph/9909065
dc.identifierhttp://arxiv.org/abs/astro-ph/9909065
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14693
dc.subjectAstrophysics
dc.titleNear-infrared photometry of the young open clusters NGC 1893 and Berkeley 86
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