Balmer Ratios and Molecular Hydrogen in M27

Details Balmer Ratios and Molecular Hydrogen in M27 Balmer Ratios and Molecular Hydrogen in M27

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915603l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #156.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present infrared (IR) observations of molecular hydrogen and longslit optical spectroscopy of planetary nebula M27 using the NICFPS and DIS III instruments with the APO 3.5 m telescope. The IR imaging provides ˜1".5 maps of the nebula in the S(1) (1-0) 2.12 μm and S(1) (2-1) 2.25 μm lines, revealing the detailed structure of the H2 distribution. The spectra are used to derive Hα/Hβ, Hγ/Hβ, and Hδ/Hβ ratios as a function of position in the nebula. Balmer ratio maps are constructed from 57 scans, covering the whole nebula. During each 200s scan the 300"×0".9 DIS slit was drifted in the spectral direction by 10". The 0".9 slit provides a spectral resolution of ˜4Å. The analysis is supplemented by recent archival Spitzer observations, which give us the possibility of investigating the spatial correlations and clumping of the material observed in the the two datasets. Four-band IRAC photometry is performed on the knots and the contribution of molecular and atomic lines to the total brightness in each band is estimated based on IRS spectra. We compare the infrared imaging to the Balmer ratio maps and estimate the implications for the excitation mechanisms of molecular hydrogen.
This work was supported by NASA grant NNG04WC03G.

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