Photometry of Variable Stars Using a Lensless Schmidt Camera

Details Photometry of Variable Stars Using a Lensless Schmidt Camera Photometry of Variable Stars Using a Lensless Schmidt Camera

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sass...28..191h&link_type=abstract

The Society for Astronomical Sciences 28th Annual Symposium on Telescope Science. Held May 19-21, 2009 at Big Bear Lake, CA. Pub

Astronomy and Astrophysics

Astronomy

Scientific paper

This paper describes the design and use of a lensless Schmidt camera (LSC) as a more cost effective alternative to more expensive telescope types. The lensless Schmidt design uses a short focal length spherical primary mirror and an aperture stop placed at the radius of curvature of that mirror. This results in an optical system without coma or astigmatism and a wide field of view. However, the LSC does have residual spherical aberration which enlarges the size of the stars being imaged by a CCD. The amount of spherical aberration tolerable in measuring stellar magnitudes and the physical length of the camera determine the possible focal ratio and aperture combinations for LSC designs. An LSC was built by the author and used to obtain data on several variable stars. Photometric V data plots for V Bootes, Chi Cygni, and U Cygni are provided as examples of the data than can be captured with this type of instrument

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