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Raman Scattering and the Hidden He II Emission Region in the Bipolar Planetary Nebula M2-9

Published online by Cambridge University Press:  26 May 2016

Hee-Won Lee
Hee-Won Lee*
Affiliation:
Dept. of Geoinformation Sciences, Sejong University, Seoul, Korea

Abstract

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In the spectrum of the young bipolar planetary nebula M2-9, we detected the He II Raman scattered feature at 6545 Å. However, in the same spectrum the He II emission lines at 6527 Å and 6560 Å are absent, which implies that the He II emission region is hidden from our line of sight and that the H I scattering region is pretty much extended not to be obscured entirely. We perform photoionization computations to estimate the physical size of the He II emission line region ≲ 1015 cm in the presence of hot luminous star with T ≳ 105 K and L ≲ 103L⊙.

Type
Part VI: The Ionized Gas in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 399 - 400
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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