Short-Time Scale Variability of MWC349 in Optical and Radio Domains

Details Short-Time Scale Variability of MWC349 in Optical and Radio Domains Short-Time Scale Variability of MWC349 in Optical and Radio Domains

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343413w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #434.13; Bulletin of the American Astronomical Society, Vol. 41, p.305

Astronomy and Astrophysics

Astronomy

Scientific paper

Our multi-year monitoring of MWC349 in optical domain (VRI) and in mm radio domain (hydrogen recombination lines and continuum) revealed long-term variability with the time scales from months to years, amplitudes of a few tens of a magnitude in optical and a factor of 2 in radio, and some vague signs of possible periodicity. Looking for potential shorter-time scale variability, we have closely monitored the star for several months in the spring and summer of 2008, in VRI and in R alone. During a part of this time, we observed the star quasi-simultaneously in R and in the masing recombination line H35α, at 2mm. The results can be summarized as follows: (1) Apparently non-periodic, sporadic drops and rises of brightness of up to 0.1m in R occur on time scales from a month to a few days; (2) The amplitude of the variations slightly increases toward shorter wavelengths; and (3) There is correlation of optical (R) and maser radiation on a time scale of days, but the amplitude of the maser variations is greater. This behavior is compatible with the model, according to which the H35α maser in the circumstellar disk of MWC349 is pumped by the UV radiation of the central star and is unsaturated. The time scale of the optical variability does not put severe constraints on the size of the emitting region (≤ 300 A.U.) This project was supported by the NSF/REU grant AST-0354056 and the Nantucket Maria Mitchell Association.

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