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| Paper: |
Statistical Parallax Analysis of SDSS M Dwarfs |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1359 |
| Authors: |
Hawley, S. L.; Bochanski, J. J.; West, A. A. |
| Abstract: |
We report on the analysis of ∼ 22,000 M dwarfs
using a statistical parallax method. This technique employs
a maximum–likelihood formulation
to simultaneously solve for the absolute magnitude, velocity
ellipsoid parameters and reflex solar motion of a homogeneous
stellar sample, and has
previously been applied to
Galactic RR Lyrae and Cepheid populations and to the
Palomar/Michigan State University (PMSU) survey of nearby low-mass stars.
We analyze subsamples of the most recent spectroscopic
catalog of M dwarfs in the Sloan Digital Sky Survey (SDSS)
to determine absolute magnitudes and kinematic properties as a function of
spectral type, color, chromospheric activity and metallicity.
We find new, independent spectral type-absolute magnitude relations,
and color-absolute magnitude relations in the SDSS filters, and compare
to those found from other methods. Active stars have brighter absolute
magnitudes and lower metallicity stars have fainter absolute magnitudes
for stars of type M0-M4. Our kinematic analysis confirms
previous results for the solar motion and velocity dispersions, with more
distant stars possessing larger peculiar motions, and chromospherically
active (younger) stars having smaller velocity dispersions
than their inactive counterparts. We find some evidence for
systematic differences
in the mean U and W velocities of samples subdivided by color. |
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