Three-micron spectroscopy of three highly reddened field stars

Details Three-micron spectroscopy of three highly reddened field stars Three-micron spectroscopy of three highly reddened field stars

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..488t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 488-496. Research supported by the Third World Acade

Astronomy and Astrophysics

Astrophysics

8

Infrared Spectroscopy, Interstellar Extinction, Late Stars, Stellar Spectrophotometry, Supergiant Stars, Absorption Spectra, Milky Way Galaxy, Stellar Luminosity, Stellar Spectra

Scientific paper

The 2.0-2.5 and 3.0-4.1 micron spectra of three luminous field late-type highly reddened stars located in different regions of the galactic plane and more than 20 deg away from the direction of the Galactic Center are presented. The observations consist of CVF spectra with resolution of around 70 and IRSPEC spectra with resolution of around 500. The possible detection of the 3.4-micron absorption feature outside the Galactic Center environment is reported. This feature has been attributed to absorption arising in a vibrational transition resulting from the C-H stretching in organic compounds. The observations indicate that the agent producing the 3.4-micron feature, presumably organic molecules, is an important component of the diffuse interstellar medium and is not characteristic only of the Galactic Center. Bandheads of SiO are also detected at 4.01 and 4.05 in the high resolution spectrum of the late-type supergiant Lynga 8 Irs3.

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