On the reality of the 3.90-3.97 micron absorption feature in W33A

Details On the reality of the 3.90-3.97 micron absorption feature in W33A On the reality of the 3.90-3.97 micron absorption feature in W33A

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251p..24g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 1, 1991, p. 24P, 25P.

Astronomy and Astrophysics

Astronomy

11

Absorption Spectra, Infrared Sources (Astronomy), K Stars, Astronomical Spectroscopy, Hydroxyl Emission

Scientific paper

The conclusion that the absorption feature is not real is challenged by an analysis of the OH lines in the calibration star and new observations of W33A. The OH lines in the calibration star are theorized to be too weak to cause the depression in the divided spectrum of W33A, and the spectrum of W33A is shown to extend beyond the 'trough' in the divided spectra of stars with strong OH lines. Observations of the absorption feature taken with a seven-channel grating spectrometer further demonstrate that the 3.90-3.97-micron feature is real.

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