Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..775d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 775-780.
Astronomy and Astrophysics
Astrophysics
17
Carbon Monoxide, Early Stars, Emission Spectra, Infrared Spectra, Stellar Spectra, Astronomical Spectroscopy, Spectral Line Width, Stellar Luminosity, Stellar Mass, Vibrational Spectra
Scientific paper
High resolution spectra of the 2.3-micron overtone band heads (v = 2-0 and 4-2) of vibrational CO emission have been obtained toward the low luminosity object WL 16. Both band heads showed noticeable smearing over 0.002-0.004 micron. A single temperature model fit to the band heads indicates an optical depth of less than unity for individual lines, with a Gaussian velocity dispersion of about 400 km/s (FWHM) plus two narrower, highly Doppler-shifted velocity features. The Br-gamma line from WL 16 also has a wide velocity spread, which can be fitted approximately by a single Gaussian linewidth of 175 km/s (FWHM). The CO v = 2-0 band head observed in the higher mass object S 106 is somewhat narrower than that in WL 16, with a fitted velocity dispersion of about 250 km/s. Two possible origins for the vibrational CO are discussed.
Dent William R. F.
Geballe Thomas Ronald
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