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| 04/26/02
| |
aime claude |
umr astrophysique |
| parc valrose | PNP- |
|
06108 |
nice, france |
Presentation 1 : Oral
Apodization and coronagraphy
Claude Aime ; Rémi Soummer
Prolate functions are the optimal apodizers for rectangular and circular apertures in stellar coronagraphy. With Roddier's phase mask technique, prolate apodizations can produce a total extinction of the star light. For Lyot's coronagraphy, the extinction, not complete, is surprisingly good for a reasonable mask size. These properties are in principle valid for a monochromatic point source. However a simple device allows to achromatise the system.