Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..251g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 251-261.
Astronomy and Astrophysics
Astrophysics
21
Astronomical Photography, Defects, Gamma Ray Bursts, Photographic Plates, Microscopy, Stars
Scientific paper
The depth structure of stellar images as well as of definite plate faults in photographic emissions is investigated by microscopy using transmitted and reflected light. This methd reveals characteristic properties of stellar images and, thus, allows a clear distinction between real stellar images and star-like plate defects. The only limitation is for very faint objects which have a brightness near the plate limit. The method is applied to all candidate objects of gamma-ray burst optical counterparts found on plates in the Sonneberg Observatory. Most of them are shown to be plate defects; the remaining cases are unsolved. Thus, there is up to now no definitive candidate for a gamma-ray burst optical counterpart on Sonneberg archival plates.
Degel W.
Greiner Jochen
Wenzel Walter
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