Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-31
Astron.J.132:2507-2512,2006
Astronomy and Astrophysics
Astrophysics
6 pages, accepted for publication in AJ
Scientific paper
10.1086/508652
We 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.
Bochanski John J.
Covey Kevin R.
Cruz Kelle L.
Hawley Suzanne L.
Liebert James
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