Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8101k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #81.01; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present spectra for 20 Herbig Ae and Be stars obtained with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope. All objects show emission from polycyclic aromatic hydrocarbons (PAHs), most very strong. Five of the spectra show strong PAH emission but no silicate emission at 10 microns. The PAH ionization fraction is higher for systems in our sample with hotter, brighter central stars. Our sample includes both flared and flattened/settled disk systems, but the overall PAH emission is not negatively correlated with independent indicators of dust settling or disk flattening. Our objects show a remarkable variety of PAH luminosities and ionization fractions, but very similar PAH spectral classifications based on positions of major PAH feature centroids. This may indicate that the PAH molecules are altered by the same physical processes in Ae/Be disks but to varying degrees. It may be that the PAH spectra indicate very little processing of the PAH molecules implying that the PAH are relatively new to the scene in Ae/Be disks. Finally, we see no strong correlations of PAH luminosity with stellar evolutionary stage from system to system.
Calvet Nuria
Chen Christine H.
Chitrakar Nirbhik
D'Alessio Paola
Forrest William John
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