The Ultraviolet Spectrum of the Planetary Nebula VY 2-2

Abstract

New ultraviolet short-wavelength (SWP) IUE observations for the protoplanetary nebula Vy 2-2 were obtained in the low dispersion mode. An exposure of 400 minute duration reveals a weak stellar continuum and several definite emission lines as well as a number of absorption features. Emission features of C III], Si III], and [Ne III] are clearly observed, while C, IV, Si II and possibly C II appear in absorption. Emission features of He II, 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 > 60,000 K. (SECTION: Interstellar Medium and Nebulae)