Using the Galactic Dynamics of M7 Dwarfs to Infer the Evolution of Their Magnetic Activity

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dc.creatorWest, Andrew A.
dc.creatorBochanski, John J.
dc.creatorHawley, Suzanne L.
dc.creatorCruz, Kelle L.
dc.creatorCovey, Kevin R.
dc.creatorSilvestri, Nicole M.
dc.creatorReid, I. Neill
dc.creatorLiebert, James
dc.date2006-08-31
dc.date.accessioned2026-07-07T11:25:58Z
dc.date.available2026-07-07T11:25:58Z
dc.descriptionWe present a spectroscopic study and dynamical analysis of ~2600 M7 dwarfs. We confirm our previous finding that the fraction of magnetically active stars decreases with vertical distance from the Galactic plane. We also show that the mean luminosity of the H-alpha emission has a small but statistically significant decrease with distance. Using space motions for ~1300 stars and a simple one-dimensional dynamical simulation, we demonstrate that the drop in the activity fraction of M7 dwarfs can be explained by thin disk dynamical heating and a rapid decrease of magnetic activity at a mean stellar age of ~6-7 Gyr.
dc.description6 pages, accepted for publication in AJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0609001
dc.identifierhttp://arxiv.org/abs/astro-ph/0609001
dc.identifierAstron.J.132:2507-2512,2006
dc.identifierdoi:10.1086/508652
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195677
dc.subjectAstrophysics
dc.titleUsing the Galactic Dynamics of M7 Dwarfs to Infer the Evolution of Their Magnetic Activity
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