Observations of Circumstellar UV Absorption Lines from the Neutral Envelopes of Planetary Nebulae

Details Observations of Circumstellar UV Absorption Lines from the Neutral Envelopes of Planetary Nebulae Observations of Circumstellar UV Absorption Lines from the Neutral Envelopes of Planetary Nebulae

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7283d&link_type=abstract

HST Proposal ID #7283

Computer Science

Hst Proposal Id #7283 Stellar Ejecta

Scientific paper

We will obtain high S/N, high-spectral-resolution, far-UV spectra of the central stars of two planetary nebulae in order to study absorption lines arising within the extended neutral and molecular envelopes around the ionized gas. The presence of these neutral envelopes or "photodissociation regions" {PDRs} has been detected by the PI in far-infrared emission lines such as [O I] 63 and [C II] 157 microns, and/or through detection of nebular absorption components of the resonance lines of Na I at 5889, 5895 A, and has important implications for our understanding of the mass, structure, and evolution of planetary nebulae. Using the echelle gratings and STIS/FUV-MAMA detector, we will take spectra of the central stars, whose UV continua will enable us to detect and measure many absorption lines of neutral and singly-ionized species such as O I, C I, C II, Si II, S II, and the CO molecule, and perhaps vibrationally excited H2 as well. We will distinguish the nebular features from lines of the same species arising from foreground interstellar material through their known radial velocity separations. This study should provide detailed information about chemical, thermal, and kinematical conditions in the neutral envelope.

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