A new method of photometric calibration of photographic plats by a doubly refracting crystal filter |
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| Authors: | M T Brück K Nandy G Caprioli F Smriglio |
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| Institution: | (1) Royal Observatory Edinburgh, Scotland;(2) Osservatorio Astronomico di Roma, Italy |
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| Abstract: | A filter composed of a crossed pair of doubly refracting crystals and a polaroid, mounted at the focal plane of the telescope, divides each star image into two images of constant intensity ratio. It is shown that such a filter arrangement is capable of providing reliable photographic calibration for stellar photometry. |
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