Statistics – Computation
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..582t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 2, p. 582-592
Statistics
Computation
24
Computational Astrophysics, Emission Spectra, Interstellar Masers, Radio Emission, Radio Stars, Stellar Envelopes, Stellar Physics, Stellar Winds, Submillimeter Waves, Brightness Temperature, H Alpha Line, Opacity
Scientific paper
We present the first detection of a recombination line maser at submillimeter wavelengths in MWC 349. The brightness temperature of the H26 alpha line at 353 GHz is larger than that of the lower frequency transitions. Over the past 3 years, the H26 alpha maser is less variable and probably more saturated than at lower frequencies. The velocity separation of the blue and red maser spikes is smaller than extrapolated from lower frequencies on the basis of circular rotation around a 32 solar mass central star. The sharp cutoff of the maser below 100 GHz is probably due to the free-free opacity of the strong stellar wind blocking the disk containing the masers. The systematic differences between the blue and red maser spikes'velocities, line widths, intensities and trend of saturation can be explained if the masers are on the ionized surface of a rotating disk with an additional small velocity component directed toward the center of rotation.
Bachiller Rafael
Martín-Pintado Jesús
Matthews Henry E.
Planesas Pere
Serabyn Eugen
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