Hα Variability in Active M Dwarf Spectra on Intermediate Timescales

Details Hα Variability in Active M Dwarf Spectra on Intermediate Timescales Hα Variability in Active M Dwarf Spectra on Intermediate Timescales

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832605b&link_type=abstract

American Astronomical Society, AAS Meeting #218, #326.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The strength of Hα emission in magnetically active M dwarfs has been observed to increase on very short (seconds) timescales during flares, and to decrease on very long (millions-billions of years) timescales with stellar aging. We utilize a set of 13,000 time-resolved active M dwarf spectra taken on several-minute intervals from the Sloan Digital Sky Survey and an independent set of 312 Hydra spectra taken hourly with the WIYN 3.5-meter telescope to study Hα variability on intermediate timescales. With several observations per target, and with many targets observed on multiple nights, we are able to probe variability in the equivalent width measurements of Hα on timescales from minutes to weeks. We will present the variability structure function and discuss it in the context of previous results.

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