Stellar photometry on glass copies of Schmidt photographic plates

Details Stellar photometry on glass copies of Schmidt photographic plates Stellar photometry on glass copies of Schmidt photographic plates

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161..408p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 2, June 1986, p. 408-411.

Astronomy and Astrophysics

Astrophysics

3

Astronomical Photometry, Image Processing, Photographic Plates, Schmidt Cameras, Stellar Spectrophotometry, Calibrating, Glass, Magellanic Clouds, Photographic Processing

Scientific paper

The author discusses a method for stellar photometry on glass copies of Schmidt photographic plates. Since most of the stars present a saturated profile on the copies, this method is based on the measurement of the area of the stellar images at a given density. Using photoelectric sequences calibration curves giving the magnitude as a function of the square root of this area are built up. These curves are very close to straight lines. It is possible to reach a very good accuracy, around one tenth of magnitude, for a broad magnitude range (about 6 mag), if the field is not too crowded. This is almost as good as what can be achieved on the original plates using conventional methods.

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