Journal
ASTRONOMICAL JOURNAL
Volume 123, Issue 6, Pages 3356-3369Publisher
IOP PUBLISHING LTD
DOI: 10.1086/340465
Keywords
Galaxy : formation; solar neighborhood; stars : chromospheres; stars : formation; stars : low-mass, brown dwarfs
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We present high-resolution echelle spectroscopy of 676 nearby Mdwarfs. Our measurements include radial velocities, equivalent widths of important chromospheric emission lines, and rotational velocities for rapidly rotating stars. We identify several distinct groups by their H properties and investigate variations in chromospheric activity among early (M0-M2.5) and mid (M3-M6) dwarfs. Using a volume-limited sample together with a relationship between age and chromospheric activity, we show that the rate of star formation in the immediate solar neighborhood has been relatively constant over the last 4 Gyr. In particular, our results are inconsistent with recent large bursts of star formation. We use the correlation between H activity and age as a function of color to set constraints on the properties of L and T dwarf secondary components in binary systems. We also identify a number of interesting stars, including rapid rotators, radial velocity variables, and spectroscopic binaries.
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