Kansas State University - Astronomy
"Equipped with his five senses, man explores the Universe around him and calls the adventure science" - Edwin P. Hubble


 
           
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An SBIG (Santa Barbara Instruments Group) DSS-7 reflection grating spectrograph w/ST-402 CCD is used to capture medium dispersion (~5.4 Ň/px) spectra.  The image below is the raw image of the spectrum of Vega - A standard candle A0V star with a surface temperature of ~ 9600 K.
vega30
Spectroscopy

vega_cor The image the the left is the final spectrum corrected for instrumental response (quantum efficiency) of the CCD which shows a remarkable black-body spectrum with prominent absorption lines. (Click on each image for a larger view)
navi_thumb As a test, the spectrum of Gamma Cassiopeiae (Gamma Cas or Navi) was taken.  A B0IV-pe star with a surface temperature ~ 30,000 K.  The star is thought to be surrounded by a shell of superheated hydrogen from which a brilliant emission spectrum is produced.   The expected spectrum should then be largely devoid of hydrogen absorption lines (itís too hot for electronic transitions in the visible portion of the spectrum) and have prominent emission lines in at least the H-alpha, and perhaps the H-beta wavelengths.  The resultant spectrum to the left bears this out remarkably well.  (Click on image for a larger view)