Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..869l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 869-876.
Astronomy and Astrophysics
Astrophysics
6
Charge Coupled Devices, Milky Way Galaxy, Open Clusters, Stellar Spectrophotometry, Image Processing, Star Distribution
Scientific paper
CCD photometry in the Galactic open clusters Haffner 18ab and 19 is presented in the B and V bands of the Johnson system as well as the G and R bands of the Becker system. The observations were tied to a set of photoelectric standards and should be affected by zero-point errors not larger than 0.03 mag for each of the four bands. All except the most blended ones of the 50 stars or so per region should be useful for photometric calibration purposes. Detailed comparison revealed systematic discrepancies between the present CCD data and previous photoelectric BV photometry. The analysis of possible reasons for this incompatibility lead to the conclusion that the agreement between the photoelectric and CCD data of the cluster stars was hampered by the different treatment of blended companions and reliable choice of sky background.
Labhardt Lukas
Schwengeler Hans
Spaenhauer Andreas
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