Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542816h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #428.16; Bulletin of the American Astronomical Society, Vol. 42, p.347
Other
Scientific paper
ABSTRACT: We present analysis of polycyclic aromatic hydrocarbon (PAH) emission in mid-infrared spectra of a large sample of Herbig Ae and Be (HAeBe) stars. The spectra were obtained with the Infrared Spectrograph on the Spitzer Space Telescope. In a previous study of 18 HAeBe stars we found: evidence that the PAH ionization fraction in the circumstellar material around HAeBe stars is related to the structure of the PAH molecules; that the center wavelengths of the PAH emission features change systematically with stellar effective temperature changes; and that HAeBe stars have may have unique mid-infrared spectral characteristics that distinguish them from other strong PAH emission sources. We also found no simple correlation between the integrated intensity of PAH emission from HAeBe stars and the geometry of their proto-planetary disks. We now have expanded the sample to include 50 stars using archival data from the Spitzer database. We present a similar analysis applied to the larger sample.
Geidel K. L.
Hyatt Jordan
Keller Luke D.
Sloan Greg C.
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