Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1100v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 3, Sept. 1992, p. 1100-1126. Research supported by CNR, ASI, and MURST.
Astronomy and Astrophysics
Astronomy
47
Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Magellanic Clouds, Star Clusters, Stellar Luminosity, Error Analysis, Main Sequence Stars, Stellar Magnitude
Scientific paper
The Johnson BV-CCD photometry of the LMC cluster NGC 1831 and of a companion field is presented. These data are used to construct a CMD of the cluster corrected for photometric incompleteness and contamination by field stars, and a luminosity function of the main-sequence stars complete down to V = 20.5. The surface brightness profile of NGC 1831 can be satisfactorily fitted with a King-Michie model with isotropic velocity dispersion and Salpeter initial mass function (x - 1.35) characterized by concentration log(rt/rc) = 1.2, core radius of 11.8 arcsec, and tidal radius of 187.0 arcsec. The photometric quality of the data is assessed by means of various crowding experiments in order to provide the completeness factors per magnitude bin for the B and V passbands, and to derive expressions for the photometric errors as a function of B and V magnitudes. From the detailed morphology of the CMD, and in particular the existence of stars in the Hertzsprung gap, it is suggested that a substantial fraction of unresolved stars is likely present.
Bertelli Giampaolo
Chiosi Cesare
Meylan George
Ortolani Sergio
Vallenari Antonella
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