Spectroscopic observations of the high-ionization planetary nebula NGC 2242 and the H II region K4-45

Details Spectroscopic observations of the high-ionization planetary nebula NGC 2242 and the H II region K4-45 Spectroscopic observations of the high-ionization planetary nebula NGC 2242 and the H II region K4-45

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..119g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, Jan. 1988, p. 119-129. Research supported by the Robert A. Welch Foundation.

Astronomy and Astrophysics

Astronomy

11

Astronomical Spectroscopy, H Ii Regions, Planetary Nebulae, B Stars, Forbidden Transitions, Infrared Astronomy Satellite, Radio Astronomy, Spectral Energy Distribution, Stellar Temperature

Scientific paper

The authors present new optical spectra of two suspected planetary nebulae. On the basis of their observations and an analysis of the radio and IRAS data, the authors conclude that K4-45 (PK 96+1) is a reddened H II region with approximately solar abundances, excited by an early B type star. On the other hand, NGC 2242 (PK 170+15) is a planetary nebula of exceptionally high ionization, displaying strong emission lines of He II, [Ne V], [Ar V], [Ne III], and [O III], but no visible lines from singly ionized or neutral species. The [O III] I(5007)/I(4363) line ratio indicates a very high electron temperature (T = 25,000K). The lack of He I emission and the presence of strong [Ne V] and He II emission indicate a nebula that is optically very thin, ionized by a central star with an effective temperature greater than 100,000K. Simple photoionization models for NGC 2242 are discussed.

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