SIMBAD references

2007AJ....133.2825R - Astron. J., 133, 2825-2840 (2007/June-0)

Meeting the cool neighbors. XI. Beyond the NLTT catalog.


Abstract (from CDS):

We have combined near-infrared data from the Two Micron All Sky Survey with ancillary optical data to identify previously unrecognized proper-motion stars that have colors and magnitudes consistent with nearby M dwarfs. We present follow-up observations of 392 stars from that sample, including ∼200 stars discussed here for the first time. Our distance estimates, based primarily on spectroscopic parallaxes, place 123 stars within 20 pc of the Sun. One hundred and seventy-six stars exhibit Hα emission, and 82 stars have plausible X-ray counterparts from ROSAT observations. The distribution of chromospheric and coronal activity is broadly consistent with data for other nearby late-type stars, with ∼30 stars having activity levels comparable to Pleiades M dwarfs. We have identified several M dwarfs that are probably wide ( >1000 AU) companions of F and G stars. We have recomputed the 20 pc luminosity function, adding the 123 new candidates found in the present survey. The revised luminosity function is in closer agreement with the 8 pc data set for stars with MJ>8 but probably remains incomplete at the ∼20% level.

Abstract Copyright:

Journal keyword(s): Galaxy: Stellar Content - Galaxy: Solar Neighborhood - Stars: Distances - Stars: Late-Type

VizieR on-line data: <Available at CDS (J/AJ/133/2825): table2.dat table3.dat table4.dat notes.dat>

Simbad objects: 441

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