Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536106t&link_type=abstract
American Astronomical Society, AAS Meeting #215, #361.06; Bulletin of the American Astronomical Society, Vol. 42, p.549
Other
Scientific paper
We present high-resolution, near-infrared spectroscopy to study CO in circumstellar disks around Herbig Ae/Be stars. We used our velocity resolved spectra to measure the distribution of gas in the circumstellar disk and thus determine the evolutionary state of the system. We have collected near-infrared spectra on over 30 young circumstellar disks around Herbig Ae/Be stars to study the physical processes in the disk. In addition, by using high-resolution spectra of the fundamental ro-vibrational CO emission lines, one can measure the position centroid of the emission as a function of velocity to provide an independent measurement of M(1/2) sin(i) and the disk inclination. Knowing the inclination is crucial for determining the radial distribution of gas inferred by other high-resolution spectra using low spatial resolution instruments such as HIFI on Herschel. Perhaps most importantly, by measuring the position centroid of the emission, we can determine where in the disk the CO emitting gas arises independent of assumptions about the disk velocity field, Keplerian or otherwise. The radial location of the CO emitting gas will bear directly on the evolutionary state of the transition objects in the sample. The results also provide a fundamental test of our fluorescence emission model, which allows our model to infer the CO emission radii in systems that are too distant to spatially resolve the emission.
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