Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..507t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 2, p. 507-518.
Astronomy and Astrophysics
Astrophysics
45
Emission Spectra, Interstellar Masers, Recombination Reactions, Stellar Envelopes, H Alpha Line, Luminosity, Radial Velocity, Radio Emission, Stellar Spectra, Stellar Winds
Scientific paper
The recombination line maser in MWC349 was monitored during a period of about 1000 days. The intensities of the masing transitions at 1 and 2 mm vary irregularly with amplitudes of up to factors 4 (at 1 mm) and 10 (at 2 mm), and time scales as short as 30 days. The velocity separation of the blue and red maser spikes increases systematically with frequency. The radial velocities of the blue and red spikes at H30-alpha were also found to be variable, but anticorrelated with each other. The accurately observable intensity ratio B/R of the blue and red maser spikes displays drastic changes in the first half of the monitoring period, but then settles to a pattern where B/R oscillates only slightly around an average value of about 0.9. From the intensity variations of the maser spikes and an estimate of the maser gain we derive a size of the maser region of about 1 mas which is likely to be associated with a rotating disk.
Bachiller Rafael
Martín-Pintado Jesús
Thum Clemens
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