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Evidence of Expansion in the Central Region of NGC 2346

Published online by Cambridge University Press:  19 July 2016

D.P.K. Banerjee
Affiliation:
Physical Research Laboratory Ahmedabad 380 009, India
B. G. Anandarao
Affiliation:
Physical Research Laboratory Ahmedabad 380 009, India
J. N. Desai
Affiliation:
Physical Research Laboratory Ahmedabad 380 009, India
S. K. Jain
Affiliation:
Indian Institute of Astrophysics Bangalore 560 034, India
D.C.V. Mallik
Affiliation:
Indian Institute of Astrophysics Bangalore 560 034, India

Abstract

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We present observations of the bipolar planetary nebula NGC 2346 carried out with the 1-m telescope at the Vainu Bappu Observatory in Kavalur, India using (1) a high resolution piezo-electric scanned Fabry-Pérot Spectrometer (with a velocity resolution of 10 km s−1) for line studies in the 6000 A - 7000 A spectral range and (2) a pressure scanned Fabry-Pérot spectrometer (with a velocity-resolution of 5 km s−1) in the green region. The nebula was observed in the H I 6563 A and [N II] 6583 A emission lines using a 15″ aperture and in the [O III] 5007 A line using an 8″ aperture centered on the bright central spot. A number of scans in each of these lines were co-added to improve the signal-to-noise ratio. The [O III] profile shows a well defined split between the blue and the red component, typical of an expanding shell. The [N II] profile does not show a well resolved split, although a pronounced suggestion of a split was observed in all the scans. The Hα profile was broad and asymmetric. The composite [O III] and [N II] profiles were decomposed into two individual Gaussians for obtaining the expansion velocity.

Type
II. Nebular Properties
Copyright
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