Observed Spectral profile of M42

Date & Time: Nov 25 2011, 25:52 JST(+0900), 15sec. exposed
Optical: Meade 25cm(10") Schmidt Cassegrain (f=2500mm, F10.0)
with SBIG DSS7 Spectrometer
Auto-guided with Meade LX200 Equatorial
Cooled CCD Camera: SBIG ST-402ME (Temp.: -25°C)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Upper strip: taken spectrogram, Lower strip: stretched 3-pixel-width & pseudo-colored image
Magnified profile around Hα line
Solid circle: Observed intensities
Megenta: Gaussian curves of Hα & N II lines
Yellow: Overlay of the Gaussians


This page shows a spectrogram of central region of M42 captured with a spectrometer and a profile provided from the image. The profile includes various emission lines of the Balmer series from H-alpha to H-delta, the ionized oxygen of O III, and weak signals of the ionized nitrogen (N II), sulfur (S II), neutral helium (He I) atoms, and so on.
A magnified spectral profile around the wavelength of H-alpha and N II lines is shown in the right hand side of full-ranged profile. The profile shows calculated intensities as solid curves fitted to observed ones under an assumption that individual emission lines have the Gaussian distribution with a standard deviation, σ=8Å. The relative intensity of N II line to that of H-alpha line can be estimated as about 12%.

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