2-D Spectroscopic Observations of O II Recombination Lines in the Planetary Nebula NGC 7009

Details 2-D Spectroscopic Observations of O II Recombination Lines in the Planetary Nebula NGC 7009 2-D Spectroscopic Observations of O II Recombination Lines in the Planetary Nebula NGC 7009

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110004h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #100.04; Bulletin of the American Astronomical Society, Vol. 39, p.911

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary results from 2-D spatially-resolved spectroscopic observations of the planetary nebula NGC 7009, obtained in September 2007 on the McDonald Observatory 2.7m telescope utilizing the integral field unit (IFU) VIRUS-P (Visible Integral-field Replicable Unit Spectrograph-Prototype; Hill et al., 2006, New Astronomy Reviews, 50, 378). The instrument delivers simultaneous spectra in 247 fibers over the wavelength range 3550-5850Å at a spectral resolving power of 1000 at 5000Å. By taking three spatially dithered integrations, fully-sampled maps can be obtained for a region of 112"×112" with an angular resolution of 4.1".
These observations are part of an observing program to investigate the enigma of the optical recombination lines (ORLs) such as those of O II, that appear to indicate higher oxygen abundances than the collisionally excited lines (CELs) from the same ion, in some planetary nebulae. In order to resolve this abundance discrepancy, Liu et al. (2000, MNRAS, 312, 585) proposed a dual-abundance model, which postulates that the nebulae which display this behavior contain cold, metal-rich, H-deficient inclusions where the ORLs are produced, embedded in hotter material of more normal composition from which the CELs arise. This model can provide a good fit to the integrated-light spectra, but the cold, metal-rich inclusions have yet to be spatially resolved or isolated. We have obtained fully-sampled maps of several planetary nebulae that display this anomaly, in an effort to find evidence for localized variations in the strengths of the ORLs relative to the CELs that would be expected if the cold, metal-rich gas is concentrated in spatially distinct clumps. In this poster we will present results from our observations to date, in particular from a recent VIRUS-P observing set of NGC 7009.
[This research was supported by NSF grants AST-0408609/-0708245 to H.L.D., and VIRUS-P has been by the Cynthia and George Mitchell Foundation.]

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