Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832504a&link_type=abstract
American Astronomical Society, AAS Meeting #218, #325.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results from a study of M dwarf magnetic activity in clusters of known ages with the ultimate goal of constraining the age-activity relation. The age-activity relation provides clues to the mechanisms generating magnetic dynamos, especially in late-type dwarfs where their stellar interiors become fully convective. Broadband griz photometry was obtained for four clusters with ages ranging from 150 Myrs to 4 Gyrs. Narrowband images of each cluster were acquired with the Maryland Magellan Tunable Filter, tuned to the frequency of H-alpha (including a correction for each cluster's radial velocity) and a nearby, similarly sized bandpass sampling the stellar pseudo-continuum. This permits a "photometric” measurement of the H-alpha emission for each star, and thus a measure of activity. Cluster membership is determined from broadband photometry and comparison to stellar positions from previous studies. We report on our findings for the clusters NGC 2516 and M67. H-alpha measurements are stronger for cluster stars than for field stars of the same magnitude. In NGC 2516, a clear correlation is seen between our H-alpha strengths measured by narrowband imaging and previous spectroscopic activity measurements in stars for which spectra have been obtained. J.M.A. acknowledges support through an NSF Graduate Research Fellowship.
Andersen Jan M.
Covey Kevin R.
McDonald Michael
Seth Aaditeshwar
Veilleux Sylvain
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