Observed Spectral profile of NGC7009

Date & Time: Sep 28 2013, from 21:53 to 21:57 JST(+0900)
Composed 2 shots with 2 minutes exposed
Optical: TAKAHASHI 12.5cm(4.9") fluorite refractor, stopped D=100mm (f=1000mm, F10.0)
with SBIG DSS7 Spectrometer
Auto-guided with VIXEN ATLUX Equatorial
Cooled CCD Camera: SBIG ST-402ME (Temp.: -10°C)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Upper strip: taken spectrogram, Lower strip: stretched 3-pixel-width & pseudo-colored image

This page shows a spectrogram of the NGC7009 (Saturn nebula) and an intensity profile provided from it. The nebula has several emission lines especially in shorter wavelength region. The profile has plotted intensities in logarithmic scale because individual emission lines have large strength ratios.
The nebula has "normal" lines of the Balmer series of hydrogen atoms from H-alpha to H-epsilon, and ionized oxygen atoms of two O III's, in addition has lines of ionized nitrogen (N II), sulfur (S II and S III), neutral and ionized helium (He I and He II), and ionized neon (Ne III).

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