Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..552s&link_type=abstract
Astrophysical Journal, Part 1, vol. 251, Dec. 15, 1981, p. 552-556.
Astronomy and Astrophysics
Astrophysics
68
Astronomical Spectroscopy, Emission Spectra, Gamma Ray Spectra, Infrared Spectra, Nebulae, Spectral Line Width, Gas Flow, High Resolution, Ionized Gases, Line Spectra, Molecular Spectra, Optical Thickness, Spectral Resolution
Scientific paper
High-resolution spectra of the Br-gamma lines of CRL 490 and M17 IRS 1 are presented, which give evidence for strong gas flows in the ionized regions associated with the objects. The Br-gamma line of CRL 490 is about 150 km/s wide at half-power, and is blueshifted by about 30 km/s with respect to the CO velocity of the surrounding molecular cloud. The Br-gamma line of M17 IRS 1 is about 135 km/s wide at half-power, and is blueshifted by about 24 km/s with respect to its molecular cloud. Mass loss rates appear to exceed 10 to the -7th solar mass per year, and modeling of the profiles shows that the Br-gamma lines are probably optically thick, which implies that estimates of the dust extinction to these objects on the basis of nebular recombination theory are invalid.
Cassar L.
Fischer Jan
Righini-Cohen G.
Simon Manfred
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