Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733916s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #339.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on a three-year CCD monitoring of MWC349A at the Maria Mitchell Observatory with narrowband and broadband filters. The use of three narrowband filters centered on Hα and adjacent continuum allowed us to separate, for the first time, the variability of this object’s Hα emission from that of the continuum. We detected a general anticorrelation of Hα emission with its nearby continuum and, tentatively, periodic variations of the Hα flux with a period of 223±7 days and a peak-to-peak amplitude of ≈6%. This period is close to the supposed period of 238±8 days for the variations of the peak ratio of the double-peak spectrum of the masing H30α line (Fuchs et al. 2010). More observations, both in the optical and radio domains, are needed to verify these new phenomena. We briefly discuss possible causes of the periodicity and the anticorrelation between the Hα emission and continuum. This project was supported by NSF/REU grant AST-0851892 and the Nantucket Maria Mitchell Association.
Schwarz Kamber R.
Strelnitski Vladimir
Walker Gabrielle
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