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High-resolution spectroscopy at near and mid-infrared wavelengths can provide important and unique information about protoplanetary disks around young stars. In particular, infrared molecular spectroscopy is a good diagnostic of gas in the planet-forming regions of disks within ~ 10 AU of the star. Data on the physical conditions, gas content, structure, and chemistry of inner disks can be...
In this review, we describe how high resolution near infrared spectroscopy and spectro-astrometry have been used to study the disks around Herbig Ae/Be stars. We show how these tools can be used to identify signposts of planet formation and elucidate the mechanism by which Herbig Ae/Be stars accrete. We also highlight some of the artifacts that can complicate the interpretation of spectro-astrometric...
Oxygen abundances are derived from the vibrational-rotational OH lines in the infrared. The flat trend of [O/Fe] between -2.5<[Fe/H]<-1.5 from the infrared lines is in sharp disagreement with published results from the electronic transitions of OH in the ultraviolet. However, we note that a careful comparison of IR-OH, [OI] and UV-OH lines in the subgiant BD +23 3130 yields excellent consistency...
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