Photometric studies of stars in the young open cluster NGC 6823

CCD and photoelectric UBV photometry are presented for 32 stars in the nuclear and coronal regions of NGC 6823 and for 13 stars in its central trapezium system. The stars in the inner and outer regions of the cluster exhibit a wide range in their derived color excesses, while the computed reddenings...

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Bibliographic Details
Published in:The Astronomical journal 1992, Vol.103 (1), p.197-203
Main Author: GUETTER, H. H
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Globular clusters in the milky way
Stellar clusters and associations
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Summary:CCD and photoelectric UBV photometry are presented for 32 stars in the nuclear and coronal regions of NGC 6823 and for 13 stars in its central trapezium system. The stars in the inner and outer regions of the cluster exhibit a wide range in their derived color excesses, while the computed reddenings for the trapezium stars are found to be very similar. Photometric data for 36 field stars toward the cluster indicates that about 0.6 mag of absorption is due to foreground interstellar material. From near-IR photometry, the reddening law is found to be uniform across the cluster and is characterized by R(V) = 3.2. Using the ZAMS fitting procedure and by assuming a distance of the Hyades of 3.3 mag, a mean reddening corrected distance to NGC 6823 of 2.1 +/-0.1 kpc is obtained. An age range between 2 and 11 x 10 exp 6 yr is found for the cluster stars. The trapezium stars are the youngest, the nuclear objects have intermediate ages, and the stars in the corona are the oldest. (Author)
ISSN:0004-6256
1538-3881
DOI:10.1086/116052