Photometric calibration of the CCD camera of 1-m telescope at VBO

Mayya, YD (1991) Photometric calibration of the CCD camera of 1-m telescope at VBO. In: Journal of Astrophysics & Astronomy, 12 (4). 319 -331.

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Abstract

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 colour terms, while those involving R are slightly colour dependent. The possibility of using scale-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 centred at H-alpha. The scaling factor is found to remain constant over a wide range of colours. The sensitivity of the telescope-filter-CCD combination is estimated to be 2.0 per cent, 8.3 per cent and 9.7 per cent in B, V and R bands, respectively. The star F117 appears to be a small-amplitude (approximately 0.05 mag) variable.

Item Type:	Journal Article
Publication:	Journal of Astrophysics & Astronomy
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	Ccd Photometry;Bvrh-Alpha Photometry;Atmospheric Extinction; Photometric Calibration;open Clusters;M67 (Ngc 2682).
Department/Centre:	Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme
Date Deposited:	30 Nov 2010 08:01
Last Modified:	30 Nov 2010 08:01
URI:	http://eprints.iisc.ac.in/id/eprint/34043

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