Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910403k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #104.03
Mathematics
Logic
Scientific paper
A primary mode of radiative energy release in stellar flares is the optical and near-ultraviolet (NUV) continuum. However, radiative-hydrodynamic models of stellar flares using a solar flare paradigm and the sparse observations of solar and stellar flare continua are all seemingly in disagreement over the type(s) of emission that contribute to the optical/NUV continuum during flares. We have completed a long-term flare monitoring campaign using simultaneous low-resolution (3400-9200A) spectroscopic and broadband photometric observations to fully characterize the optical/NUV white light continuum emission on short timescales. To date, our most significant results come from observations during the decay phase of a megaflare on the dM4.5e star YZ CMi, where we have detected multiple continuum components that contribute to the white light near the Balmer jump (3646A). We present a time-resolved spectral analysis of the continuum components and emission lines for this flare and for several other large and small flares obtained during our spectroscopic monitoring campaign. We compare these data to phenomenological flare models with the RH code and to preliminary results from the next-generation of radiative-hydrodynamic 1D flare models with the RADYN code.
Funding for this project has been provided by NSF AST 0807205. Observations were obtained with the ARC 3.5m, the NMSU 1m, and the ARCSAT 0.5m at the Apache Point Observatory.
Hawley Suzanne L.
Kowalski Adam
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