The ultraviolet spectrum of the planetary nebula VY 2-2

Details The ultraviolet spectrum of the planetary nebula VY 2-2 The ultraviolet spectrum of the planetary nebula VY 2-2

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..595f&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 688, p. 595-598.

Astronomy and Astrophysics

Astronomy

4

Absorption Spectra, Emission Spectra, Iue, Planetary Nebulae, Ultraviolet Astronomy, Ultraviolet Spectra, Abundance, Electron Density (Concentration)

Scientific paper

New ultraviolet short-wavelength (SWP) IUE observations for the proto-planetary nebula Vy 2-2 were obtained in the low-dispersion mode. An exposure of 400-min duration reveals a weak stellar continuum and several definite emission lines as well as a number of absorption features. Emission features of semiforbidden C III, semiforbidden Si III, and forbidden Ne III are clearly observed, while C IV, Si II, and possibly C II appear in absorption. Emission features of He II, semiforbidden O III, and Al III are also indicated, though less certain. The UV spectrum tends to confirm that Vy 2-2 is a young, dense planetary nebula excited by a central star with T(eff) greater than 60,000 K.

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