Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..373k&link_type=abstract
Astronomical Journal, vol. 83, Apr. 1978, p. 373-375.
Astronomy and Astrophysics
Astronomy
6
Infrared Spectroscopy, Interstellar Gas, Stellar Spectrophotometry, Absorption Spectra, Carbon Monoxide, Gas Density, Hydrogen, Near Infrared Radiation, Stellar Spectra
Scientific paper
Two spectra of the highly reddened star Cyg OB2 No. 12 are examined which were obtained in the wavelength range from 1.5 to 2.5 microns (4000 to 6700 kaysers) with a resolution of about 50,000 (0.1 kayser) using a prototype rapid-scanning 10-cm Fourier-transform spectrometer at the coude focus of a 4-m telescope. No interstellar lines due to H2 or CO in the cloud obscuring No. 12 are observed in either spectrum, the most prominent stellar features are shown to be Brackett lines of atomic hydrogen, and the spectra are compared with a similar spectrum of Beta Ori. An emission line appearing at 4678.76 kaysers in the spectra of No. 12 is tentatively identified as being due to Mg II. Upper limits to the column densities of H2 and CO are computed from the 2-micron absorption spectrum on the assumption that the lines are narrower than one resolution element but not so extremely narrow as to be saturated.
Hall Donald N. B.
Kleinmann Susan G.
Ridgway Stephen T.
Wright Louis E.
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