Observed Spectral profile of NGC4361


Date & Time: Apr 13 2013, from 23:37 to 23:47 JST(+0900)
Composed 2 shots with 10 minutes exposed
Optical: Meade 25cm(10") Schmidt Cassegrain (f=2500mm, F10.0)
with SBIG DSS7 Spectrometer
Auto-guided with Meade LX200 Equatorial & Pictor 201 XT
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


This page displays a spectrogram of NGC4361 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-gamma and the ionized oxygen atoms of two O-III lines. Those lines are familiar to many other planetary nebulae, but NGC4361 has a strong peculiar line of He-II at 4686Å from ionized helium atoms.


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