Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...215l..13m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 215, no. 2, May 1989, p. L13-L16. Research supported by CAICYT.
Astronomy and Astrophysics
Astrophysics
60
H Ii Regions, Interstellar Masers, Line Spectra, Radio Spectra, Brightness Temperature, Electron Energy, Stellar Winds, Thermodynamic Equilibrium
Scientific paper
The detection of the recombination lines H41-alpha, H31-alpha, H30-alpha, and H29-alpha toward MWC349 is reported. It is found that the 3.3-mm H41-alpha line has a Gaussian profile, that the 1-mm H31-alpha, H30-alpha, and H29-alpha lines have double-peaked profiles, and that the 1-mm lines are at least a factor of 50 stronger that the 3.3-mm line. It is suggested that the H41-alpha line can be explained by LTE emission in an isothermal stellar wind with an electron temperature of 600 K and a constant expansion velocity of about 50 km/s, and that the anomalous radio recombination lines near 1 mm are due to an amplifying maser with an optical depth smaller than -1.
Bachiller Rafael
Martín-Pintado Jesús
Thum Clemens
Walmsley Malcolm
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