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Astron. Astrophys. 351, 1036-1040 (1999)

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PN G218.9-10.7: a galactic emission nebula of unique morphology *

A. Ali  ** and J. Pfleiderer

Institut für Astronomie der Leopold-Franzens-Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria

Received 1 December 1998 / Accepted 28 June 1999

Abstract

We present an H[FORMULA] + [N II] narrow band image and optical spectra of the galactic nebula PN G218.9-10.7 that has been hardly studied up to now and is suspected to be a planetary nebula. Its morphology is quite unusual: the nebula appears to consist of both symmetric components and asymmetric diffuse ones, and also displays long straight filaments in the east. It rather looks like a combination of morphological features found in HII regions, supernova remnants and planetary nebulae. The nebula has very low [O III] emission, and is close to a very blue faint star that has been supposed to be of high gravity nature. Detailed description and attempt to give an interpretation of the morphology for this nebula are discussed. The spectral results of the object have been derived, such as the interstellar extinction, excitation class, electron temperature, and electron density.

Key words: ISM: planetary nebulae: individual: PN G218.9-10.7 – ISM: planetary nebulae: general

* Based on observations obtained at the European Southern Observatory and the Las Campanas Observatory
** Permanent address: Cairo University, Faculty of Science, Astronomy Department, Giza, Egypt.

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© European Southern Observatory (ESO) 1999

Online publication: November 16, 1999
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