Analysis of the High Dispersion Spectra of the Planetary Nebula NGC 7027

Details Analysis of the High Dispersion Spectra of the Planetary Nebula NGC 7027 Analysis of the High Dispersion Spectra of the Planetary Nebula NGC 7027

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812714h&link_type=abstract

American Astronomical Society, AAS Meeting #218, #127.14; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the high dispersion spectra taken with the Keck I HIRES in 1998 August 13 - 15, we analyzed the electron density and electron temperature variation of the nebular gas shell of the planetary nebula NGC 7027. The employed slit dimensions and the observed wavelength regions are the following four settings: 1) 14" x 0.862" (8530 - 6309A; red collimator); 2) 10" x 0.862" (5130 - 7475A; red collimator); 3) 7" x 0.862" (3100 - 4100A; red collimator); and 4) 3.5" x 0.862" (3450 - 5900A; blue collimator). Since these employed slit lengths were shorter than the dimension of NGC 7027, we shifted the slit entrance of the HIRES on a nebular image and obtained various diagnostic spectral lines from the major and minor axes of the nebula. Many diagnostic lines, such as [N II]5755, 6583; [O III]4363, 4959+5007; [O II]3726, 3729; and [Ar IV]4711, 4740 that were useful in finding the physical conditions, were obtained. We present the line ratios and the anlayzed physical conditions in the main shell of the nebula that show some variation; log Ne = 4.25 - 4.75 cm-3 ([S II], [Cl III], & [Ar IV]) and Te = 13000 - 18000 K ([O III]). Although the analysis shows fluctuations in the physical condition, we postpone any conclusion on the existence of fine-structures in the main shell, responsible for high-density or high electron temperature components.

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