The 3.4-micron interstellar absorption feature in CYG OB2 no. 12

Details The 3.4-micron interstellar absorption feature in CYG OB2 no. 12 The 3.4-micron interstellar absorption feature in CYG OB2 no. 12

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..400a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, April 1, 1990, p. 400-404. Research supported by S

Astronomy and Astrophysics

Astronomy

67

Absorption Spectra, Infrared Absorption, Infrared Spectra, Interstellar Extinction, Stellar Spectra, Astronomical Spectroscopy, Carbon, Galactic Nuclei, Line Of Sight, Linear Polarization, Silicates

Scientific paper

A UKIRT grating-resolution 3.2-3.6 micron spectrum of the heavily reddened star Cyg OB2 no. 12 is prepared. A 3.4-micron absorption feature is present, whose profile matches that seen in the Galactic Center source IRS7. Both this feature and the 9.7-micron silicate absorption are weaker in Cyg OB2 no. 12 than in lines-of-sight toward the Galactic Center. An explanation is developed using the optical properties of hydrogenated amorphous carbon.

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