NGC 7635 spectrum
Instrument : Celestron 11 (D
= 0.28 m) + LISA
spectrograph (click here for
technical informations) at R = 800 + Atik 324L+ CCD camera
Observatory : Castanet-Tolosan
Observer : Christian Buil
Exposure : 9 x 300 s (Oct. 15, 2011)
Download spectra here : _ngc7635_20111015_793.fit / _ngc7635b_20111015_863.fit / _ngc7635c_20111015_863.fit / _ngc7635b_20111015_863.fit
2D spectra of NGC 7635 region (two slit position - 35 microns wide).
Spectral change function of considered nebula zone.
Method for isolate the spectrum (double exposure - one directed on the nebula, one directed outside the nebula, then subtraction of the two shots). The acqusition are doing in a severe light pollution suburban conditions.
Note the signal to noise ration degradation at the level of intense parasitic spectral zone (photon noise) - but a spectrograph is very efficient for observe under hard condition (Halpha, [OIII], ... spectral signature are well preserved).