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Brightness Calibration of Digitized Objective-Prism Plates

Published online by Cambridge University Press:  26 July 2016

D. Engels ,
L. Cordis  and
T. Köhler
D. Engels
Affiliation:
Sternwarte der Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany
L. Cordis
Affiliation:
Sternwarte der Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany
T. Köhler
Affiliation:
Sternwarte der Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany

Extract

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Currently, IIIa-J objective-prism plates from the Calar Alto and ESO Schmidt telescopes are used at the Hamburg Observatory to search for and to identify new astronomical objects. Major projects are the Hamburg Quasar Survey, the Hamburg-ESO Survey, and the Hamburg-Munich collaboration to identify sources from the ROSAT All-Sky Survey (cf. contributions to this conference by Hagen et al., Wisotzki, and Voges). The objective-prism plates are digitized with a PDS microphotometer. To determine the brightness of the digitized objects, a method to calibrate the plates was developed, using an internally determined characteristic curve and its external calibration with photometric sequences. Having spectral information, we are able to synthesize the Johnson B-filter as this filter is fully covered by the spectra.

Type
Part Six: Calibration: Astrometric and Photometric
Information
Symposium - International Astronomical Union , Volume 161: Astronomy from Wide-Field Imaging , 1994 , pp. 317 - 319
Copyright
Copyright © Kluwer 1994 

References

Köhler, Th., 1991. Diploma Thesis, Hamburg University.Google Scholar
Köhler, Th., Groote, D. and Wisotzki, L., 1992. ‘Reconstruction of Saturated Spectra on Objective Prism Plates’, in 4th ESO/ST-ECF Data Analysis Workshop, eds. Grosb⊘l, P.J. and de Ruijsscher, R.C.E. Google Scholar