NOW SHOWING! The Big Picture -- Putting the SCR Sample in Context

Details NOW SHOWING! The Big Picture -- Putting the SCR Sample in Context NOW SHOWING! The Big Picture -- Putting the SCR Sample in Context

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340704w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #407.04; Bulletin of the American Astronomical Society, Vol. 41, p.203

Statistics

Scientific paper

Numerous white, red, and brown dwarfs are being discovered in the solar neighborhood by a number of groups using proper motion and photometric surveys, literature trawls, and parallax programs. Through a combination of novel searches for previously unidentified nearby stars and comprehensive assessments of previous survey work, the RECONS group has been one of the most productive programs in discovering the Sun's neighbors, in particular those in the southern hemisphere.
Searches utilizing the SuperCOSMOS electronic archives of photographic plates have proven to be a successful discovery method for our team, yielding 108 red dwarf SCR (SuperCOSMOS RECONS) systems. Distance estimates are first made using plate photometry combined with 2MASS JHK data to assess proximity. Promising targets within 25 pc are then observed for VRI photometry, which is also combined with 2MASS JHK data to improve the distance estimates (average errors only 15%). To date, 75% of those originally predicted to be nearer than 25 pc using the photographic magnitudes remain within that horizon using the more accurate CCD photometry.
Stars within 15 pc are then targeted for trigonometric parallaxes as part of the long-term CTIO Parallax Investigation carried out at the CTIO 0.9m. These new nearby systems bolster the statistics needed to understand the true population of stars near the Sun, as well as providing compelling binaries for objects with masses near the end of the stellar main sequence. Our discoveries constitute a significant contribution to the existing solar community and move us closer to a comprehensive census of the solar neighborhood.
This work is supported by NSF grant AST 05-07711, NASA's Space Interferometry Mission, the SMARTS Consortium, and Georgia State University.

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