The filamentary nebula YM 29 - Spectrograms and emission-line photographs

Details The filamentary nebula YM 29 - Spectrograms and emission-line photographs The filamentary nebula YM 29 - Spectrograms and emission-line photographs

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63..255l&link_type=abstract

(Astronomicheskii Zhurnal, vol. 63, Mar.-Apr. 1986, p. 255-264) Soviet Astronomy (ISSN 0038-5301), vol. 30, Mar.-Apr. 1986, p. 1

Astronomy and Astrophysics

Astronomy

2

Astronomical Photography, Emission Spectra, Line Spectra, Monochromatic Radiation, Planetary Nebulae, Spectrograms, Data Processing, Isophotes, Spectral Energy Distribution

Scientific paper

Spectrograms as well as monochromatic photographs and isophotes in three emission features have been obtained for YM 29, an old planetary nebula of Peimbert type PN I. The morphology depends on the ionization state: diffuse forbidden O III emission is accompanied by fine forbidden N II, forbidden S II filaments. Moreover the radiation is stratified, with regions bright in the forbidden O II line located 10-40 arcsec closer to the nucleus than the forbidden N II, forbidden S II emission sites. Similar morphology distinctions and stratification, typifying nebulae ionized by the central star's ultraviolet radiation, have previously been reported in a kindred object, Simeiz 22.

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