Near-infrared photometry of the young open clusters NGC 1893 and Berkeley 86
Abstract
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. Based on observations taken at TIRGO
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1999
- DOI:
- 10.48550/arXiv.astro-ph/9909065
- arXiv:
- arXiv:astro-ph/9909065
- Bibcode:
- 1999A&A...349..825V
- Keywords:
-
- 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;
- Astrophysics
- E-Print:
- 9 pages, 12 figures, Astronomy &