Rotation & Activity in Mid-M to L Dwarfs

Details Rotation & Activity in Mid-M to L Dwarfs Rotation & Activity in Mid-M to L Dwarfs

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..683m&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

4

Rotation Velocity, Chromospheric Activity, M Dwarfs, L Dwarfs

Scientific paper

We analyze rotation velocities and chromospheric (Hα) activity, derived from multi-year, high-resolution spectra, in 56 mid-M to L dwarfs. Rotation velocities are found to increase from mid-M to L. This is consistent with a lengthening of spin-down timescale with later type, though in the L types the trend may also be a function of stellar age. From M5 to M8.5, a saturation-type rotation-activity relation is seen, similar to that in earlier types. However, the saturation velocity in our case is much higher, at ˜ 12 km s-1. A sharp drop in activity is observed at ˜ M9, with later types showing little or no Hα emission, in spite of rapid rotation. This may be due to the very high resistivities in the predominantly neutral atmospheres of these cool objects.

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