Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001javso..29..154j&link_type=abstract
The Journal of the American Association of Variable Star Observers, vol. 29, no. 2, p.154
Physics
Mwc349, Variable Stars, Masers
Scientific paper
We review the results of a multi-wavelength study of the unique variable star MWC349 done at the Maria Mitchell Observatory. This early-type, emission-line star is the only known natural hydrogen maser and the only known natural laser, both originating in the ionized, expanding atmosphere of an edge-on circumstellar disk. We have studied the variability of the star on the red photographic plates of the Harvard College Observatory plate collection (for the years 1967-1982) and monitored it for three years (1997-2000) in UBVRI (with the 31-inch CCD telescope of the Lowell Observatory in Flagstaff) and in the millimeter radio domain (with the 12-m NRAO radio telescope on Kitt Peak). We reveal several types of variability in this star: long time-scale variations with a probable quasi-period of 1.5 years in all the observed colors of the optical domain; complex variations, with several different time scales, in the masing hydrogen recombination radio lines; and, probably, slight variations of the radio continuum that correlate with those of the optical light. We discuss possible physical mechanisms responsible for all these variations.
Jorgenson Regina
Strelnitski Vladimir
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