Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-07-25
Astronomy and Astrophysics
Astrophysics
Postscript file, 13 pages, 1 figure (figure available on request), paper accepted for publication in the Bulletin of Astronomi
Scientific paper
We have been doing a photometric and astrometric sample survey programme on Schmidt plates in a few selected directions in the Galaxy with an aim to study galactic stellar populations. In order to calibrate Schmidt plates photometrically, it is necessary to have a number of photometric standards which cover the entire range of magnitudes to be studied on the plates. As Schmidt plates cover a wide area of the sky, the standards should also be spread over the surface of the plate so as to minimise geometrical effects present on the plate. This paper is first in a series of papers aimed at to provide photometric standards in the selected galactic directions to be studied. In this paper we present photometric magnitudes obtained through CCD observation in the galactic direction (l=170deg, b=45deg) centered at alpha(2000) = 9h 41m 20s and delta(2000) = +49deg 54' 20'' and covering an area of 14 sq degs. B and V magnitudes have been obtained for a total of 214 stars out of which for 73 stars U magnitudes also have been obtained. The magnitude range covered is 11
Bhatt Bhuwan Chandra
Bienayme Olivier
Chareton M.
Creze Michel
Haywood Misha
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