Investigating Stars and Nebulae Through the Construction and Operation of an Astronomical Spectrograph

Details Investigating Stars and Nebulae Through the Construction and Operation of an Astronomical Spectrograph Investigating Stars and Nebulae Through the Construction and Operation of an Astronomical Spectrograph

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.4816m&link_type=abstract

American Astronomical Society Meeting 205, #48.16; Bulletin of the American Astronomical Society, Vol. 37, p.373

Astronomy and Astrophysics

Astronomy

Scientific paper

Two astronomical spectrographs were constructed and were attached in turn to a 30 cm Schmidt Cassegrain telescope. The first used a 90 degree angle configuration, 600 lines/mm diffraction grating, 40 mm collimation lens, and a 55 mm camera lens, and spectra were captured with a digital SLR camera. This spectrograph had a range of 6000A but had a spectral resolution of only 19A. Next a classical spectrograph with an overall angle of 38 degrees was constructed. The second design used a 135 mm focal length collimation lens, 600 l/mm grating, and 50 mm f/1.2 camera lens on a SBIG ST-7E ccd camera. It produced higher resolution spectra, with a range of 2013A and a spectral resolution of 8A. Wavelength callibration was performed with an Hg lamp. CCDOPS was used to acquire images and SBIG's Spectra and Desnoux's Visual Spec programs were used to wavelength and flux calibrate spectra. The stellar classes of stars and the elemental composition of nebulae were then inferred. Successful innovations included a slit with zeroth order imaging window and a method for high resolution calibrated slitless spectroscopy. We would like to thank the AAS, the IAPPP, and the NSF for funding our prize.

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