Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991japa...12..319m&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 12, no. 4, Dec. 1991, p. 319-331.
Astronomy and Astrophysics
Astrophysics
10
Astronomical Photometry, Atmospheric Effects, Charge Coupled Devices, Instrument Compensation, Open Clusters, Astronomical Observatories, H Alpha Line, Multispectral Band Cameras, Telescopes
Scientific paper
Calibration of the CCD camera of the 1-m telescope at the Vainu Bappu Observatory, Kavalur, to the BVR system is reported here based on the observations of stars in the 'dipper asterism' in the open cluster M 67 (NGC 2682). Transformations involving B and V have negligible color terms, while those involving R are slightly color dependent. The possibility of using scaled-down R band fluxes to estimate the continuum flux at H-alpha is investigated by comparing the counts in R band with those through an interference filter center at H-alpha. The scaling factor is found to remain constant over a wide range of colors. The sensitivity of the telescope-filter-CCD combination is estimated to be 2.0 percent, 8.3 percent and 9.7 percent in B, V and R bands, respectively. The star F117 appears to be a small-amplitude (about 0.05 mag) variable.
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