Observed Spectral profile of M8

Date & Time: Sep 28 2013, from 19:45 JST(+0900), 2min. 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
Magnified profile around Hα line
Solid circle: Observed intensities
Megenta: Gaussian curves of Hα & N II lines
Yellow: Overlay of the Gaussians


This page displays a spectrogram of central region of M8 (Lagoon nebula) taken with a spectrometer and a spectral profile provided from it.
The profile shows emission lines from the Balmer series from H-alpha to H-epsilon, ionized oxygen (O III), sulfur (S II), and neutral helium (He I).
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 measured ones under an assumption that individual emission lines have the Gaussian distribution with a standard deviation, σ=8Å. The relative intensities of two N II lines at 6546Å and 6583Å to that of H-alpha line can be estimated as about 6% and 26%, respectively.
Slit position at M8 (north in up)

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