The 4 micron spectra of compact infrared sources

Details The 4 micron spectra of compact infrared sources The 4 micron spectra of compact infrared sources

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160...18h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 1, May 1986, p. 18-24. NATO-supported research.

Astronomy and Astrophysics

Astrophysics

4

Abundance, Hydrogen Clouds, Infrared Spectra, Line Spectra, Near Infrared Radiation, Radiation Sources, Carbon Monoxide, Emission Spectra, High Resolution, Interstellar Matter, Potassium, Spectral Resolution

Scientific paper

High resolution 5 arcsec spectra in the 4 micron region are presented of the central 5 arcsec of the compact near infrared sources K3-50, W51-IRS2 East, and G333.6-0.2. From measured Br-alpha/Pf-beta line ratios and previously published infrared and radio maps, it is concluded that standard recombination theory fails to explain our observations in at least two cases. It is demonstrated that the data are consistent with thermal excitation of the hydrogen lines in strong stellar winds. The Pf-beta Hu-epsilon line ratio, which is completely insensitive to differential extinction, confirms the need for the stellar wind model for the core of G333.6-0.2. From the (K III) line it is estimated that the potassium abundance in G333.6-0.2 is at least equal to the solar value, and possibly enhanced by a factor up to 10.

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