Measurement of CO overtone line profiles in SVS 13

Details Measurement of CO overtone line profiles in SVS 13 Measurement of CO overtone line profiles in SVS 13

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393l..67c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 393, no. 2, July 10, 1992, p. L67-L70.

Astronomy and Astrophysics

Astrophysics

28

Carbon Monoxide, Early Stars, Infrared Stars, Line Shape, Stellar Spectra, Local Thermodynamic Equilibrium, Molecular Clouds, Pre-Main Sequence Stars, Vibrational Spectra

Scientific paper

High-resolution spectra of the CO overtone emission in the infrared source SVS 13 are obtained and the individual vibration-rotation lines are resolved for the first time in a young stellar object. The observed FWHM velocity of the lines in the v = 2-0 band is 40 km/s. A fit of the v = 2-0 band head with a single temperature LTE slab model yields an optical depth of 0.3 in the R(51) line and a rotational temperature of about 3500 K. Given the best estimates for the orientation of the SVS 13 outflow, the observed line widths are much smaller than expected for either of the two most favored interpretations for the CO emission: a circumstellar disk or a high-velocity neutral wind.

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