Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.175..191g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 175, no. 2, Jan. 1991, p. 191-206. Research supported by National Astronom
Astronomy and Astrophysics
Astronomy
2
Planetary Nebulae, Stellar Evolution, Ultraviolet Astronomy, Absorption Spectra, Emission Spectra, Interstellar Matter, Iue, Stellar Envelopes, Stellar Temperature
Scientific paper
The IUE ultraviolet spectral recording for a low excitating planetary nebula NGC 6369 is obtained. The very strong doublet 2800 Mg II in emission as well as not less strong absorption line 2852 Mg I are discovered in the spectrum of this nebula. It is shown that the resonance line 2852 Mg I may originate only in a neutral envelope, around the nebula, consisting of neutral hydrogen, neutral magnesium, and dust particles (H I + Mg I). The possibility of the existence of one more envelope, transition zone immediately contacting with the bright that is ionized part of nebula (H II + Mg II), is also shown. The transition zone consists of neutral hydrogen, ionized magnesium and dust particles (H I + Mg II). The main parameters of this zone are also obtained. The temperature of the central star of this nebula is 48,000 K. Continuous background in the interval 2600-3000 A is identified with Balmer continuum, with electron temperature T(c) = 12,500 K.
Egikian Anahit G.
Gurzadian Grigor A.
Terzian Yervant
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