Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.7602s&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #76.02; Bulletin of the American Astronomical Society, Vol. 33, p.1419
Astronomy and Astrophysics
Astronomy
Scientific paper
Variations of the masing hydrogen recombination lines on various times scales from a few months to a few weeks have previously been observed in the peculiar emission line star MWC349. In order to detect shorter term variability, we observed the star with the Kitt Peak 12-meter radio telescope in the masing H35α line for three sessions of a few days each. At least one session demonstrates day-to-day variations of the intensities, radial velocities, and widths of both the narrow and broad spectral components exceeding the typical errors. We explain the observed variations in terms of the current model of the source --- inhomogeneous circumstellar disk and bipolar outflow ionized by a variable central source of ultraviolet radiation. The authors thank Dr. John P. Schaefer and the Research Corporation for providing the funding to keep the Kitt Peak 12-meter telescope operational so that this project could be completed. This project was supported by the NSF/REU grant AST-9820555 and the Nantucket Maria Mitchell Association.
Strelnitski Vladimir
Weirich J.
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