C. T. Finch, N. Zacharias, M. R. Boyd, T. J. Henry, N. C. Hambly
We present 474 new proper motion stellar systems in the southern sky having
no previously known components, with 0.40" yr^-1 > mu >= 0.18" yr^-1 between
declinations -47 deg and 00 deg. In this second paper utilizing the U.S. Naval
Observatory third CCD Astrograph Catalog (UCAC3) we complete our sweep of the
southern sky for objects in the proper motion range targeted by this survey
with R magnitudes ranging from 9.80 to 19.61. The new systems contribute a ~16%
increase in the number of new stellar systems for the same region of sky
reported in previous SuperCOSMOS RECONS (SCR) surveys. Among the newly
discovered stellar systems are 16 multiples, plus an additional 10 components
that are new common proper motion companions to previously known objects. A
comparison of UCAC3 proper motions to those from Hipparcos, Tycho-2, Southern
Proper Motion (SPM4), and SuperCOSMOS indicates that all proper motions are
consistent to ~10 mas/yr, with the exception of SuperCOSMOS. Distance estimates
are derived for all stellar systems having SuperCOSMOS Sky Survey (SSS) B_J,
R_59F, and I_IVN plate magnitudes and Two-Micron All Sky Survey (2MASS)
infrared photometry. We find five new red dwarf systems estimated to be within
25 pc. These discoveries support results from previous proper motion surveys
suggesting that more nearby stellar systems are to be found, particularly in
the fainter, slower moving samples.
In this second paper utilizing the U.S. Naval Observatory third CCD
Astrograph Catalog (UCAC3) we complete our sweep of the southern sky for
objects in the proper motion range targeted by this survey with R magnitudes
ranging from 9.80 to 19.61.
View original:
http://arxiv.org/abs/1111.6805
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