Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112406s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #124.06; Bulletin of the American Astronomical Society, Vol. 39, p.954
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from a survey of 3.3 micron PAH emission in planetary nebulae performed at Lick observatory using the FLITECAM instrument. FLITECAM is a 1-5 micron camera and spectrometer developed for SOFIA, the Stratospheric Observatory for Infrared Astronomy. The survey was conducted as part of ground-based commissioning of a grism spectroscopy mode utilizing direct-ruled KRS-5 grisms. K band and 3 micron spectra were obtained at a resolution of R 1700. Targets were selected from ISO, IRAS and KAO observations. Targets were preferentially selected for observed PAH emission at longer wavelengths, but three oxygen rich planetary nebulae and four carbon stars were also included in the sample in order to constrain detection thresholds. In total, 21 objects were observed, 11 of which showed PAH emission. PAH emission central wavelength, FWHM, equivalent width and overall shape was characterized in each of the nebulae with PAH detections; upper limits were determined for those nebulae with no detected PAH emission. The average central wavelength was 3.288 +/- 0.0021 microns with a FWHM of 0.042 +/- 0.0026 microns. Using the PAH equivalent width of those objects with known C/O ratios we determined a threshold C/O ratio of 0.64 +/- 0.1 for detectable PAH emission. Objects with detected PAH emission were further studied using the NIRSPEC instrument at the W.M. Keck observatory. Medium-resolution (R 2000), 3 micron spectra of each nebula was obtained at several locations across the nebula's extent. The PAH emission band shape, strength and central wavelength was characterized, and was found to exhibit variability dependant on nebular position.
McLean Ian S.
Smith Erin C.
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