wpo - session spectra - 2002 Sept 23-30

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2002 Sept 23-30:  A week of observation in poorish transparency.  Some images taken through thin cloud so there are few excuses with spectroscopy!  These lo-res spectra via the SX MX5c single-shot colour camera coupled to a 30cm SCT with the Rainbow transmission grating immediately before the CCD to yield a dispersion of 22A/pixel in exposures from 0.01s for brilliant Vega to 60s for faint variable FI Lyr.  The sessions include exotic Wolf-Rayet emission-line stars in Cygnus/Cepheus posted separately.

All spectra extend into the colourless IR [to right], especially red/IR stars at the bottom of the page, but the visual observer's view is confined principally to the green part of the spectrum  and a little of the blue and red either side.  Photons outside these wavelengths have little effect on the retina.

Double star Albireo [b¹Cyg] is an orange K3II star with companion b²Cyg [shown in blue profile] a hotter blue star of spectral type B9.5 like Vega [AOVa] part of the Summer Triangle with Deneb [a Cyg] and Altair [a Aql].  Planet Uranus, with strong methane absorption lines, included below.