Abstract
The role of medium resolution spectroscopy in the two micron region is discussed. Examples of the spectral features amenable to observation are shown. These include the vibration rotation bands of the important molecules 12C16O, 13C16O, H2O and CN, as well as the Bγ line of hydrogen. Band strength-colour and -luminosity relations for the CO and H2O bands have been derived from observations of approximately 100 stars of spectral types later than G5. The interpretation of these and the outstanding problems (such as the colour dependence of the CO band strengths in carbon stars) are discussed.
Examples of the use of two-micron spectroscopy in the spectral classification of infrared sources, and the infrared components of symbiotic stars, etc., are shown. The extension of this kind of observation to the nuclei of galaxies is briefly discussed in relation to stellar population studies.
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Hyland, A.R. (1974). Medium Resolution Stellar Spectra in the Two-Micron Region. In: Contopoulos, G. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2211-8_22
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