Three components of 3-4 micron absorption bands

Details Three components of 3-4 micron absorption bands Three components of 3-4 micron absorption bands

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..97..369w&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 97, no. 2, Dec. 1983, p. 369-378.

Astronomy and Astrophysics

Astronomy

9

Absorption Spectra, Astronomical Spectroscopy, Infrared Astronomy, Interstellar Extinction, Molecular Clouds, Stellar Envelopes, Formaldehyde, Spectral Bands

Scientific paper

Two to four micron spectra of six infrared sources for which the extinction is not purely interstellar, but is dominated by circumstellar or molecular cloud dust are presented. In all cases the absorption bands differ from the interstellar case, though a component of the interstellar absorption is often present. An improved absorption spectrum for the galactic center source IRS 7, correcting spurious features in a previous spectrum, is also presented. Three independent components can be identified: (1) the interstellar component, probably of organic origin, and itself not necessarily invariant; (2) the symmetrical water ice feature at 3.06 microns, found most commonly in molecular clouds; and (3) a component at 3.53 microns possibly identified with solid formaldehyde grains, and seen only in molecular clouds because of its weakness. Other absorption components appear to be unrelated to those in the 3-4 micron region, most notably the 10 micron absorption found in oxygen-rich giants and the interstellar medium, and presumable inorganic in nature. These observations include the first detection of water ice absorption in a source in the Rho Oph dark cloud. Biological materials provide the best fit to the interstellar case, but do not presently account for the distinct 3.53 micron component.

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