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J/ApJ/745/118 UCAC3 proper motion survey. II. -47<DEC<0deg (Finch+, 2012)
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Beginning of ReadMe :J/ApJ/745/118 UCAC3 proper motion survey. II. -47<DEC<0deg (Finch+, 2012)
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UCAC3 proper motion survey.
II. Discovery of new proper motion stars in UCAC3 with 0.40"/yr>mu>=0.18"/yr
between declinations -47deg and 00deg.
Finch C.T., Zacharias N., Boyd M.R., Henry T.J., Hambly N.C.
<Astrophys. J., 745, 118 (2012)>
=2012ApJ...745..118F
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ADC_Keywords: Stars, nearby ; Proper motions ; Surveys ; Photometry ;
Stars, distances
Keywords: astrometry - solar neighborhood - stars: distances -
stars: statistics - surveys
Abstract:
We present 474 new proper motion stellar systems (500 objects) in the
southern sky having no previously known components, with
0.40"/yr>mu>=0.18"/yr between declinations -47deg and 0deg. 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 Research Consortium On Nearby
Stars (RECONS) surveys. Among the newly discovered stellar systems are
16 multiples, plus an additional ten 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, and SuperCOSMOS indicates that all proper motions are
consistent to 10mas/yr, with the exception of SuperCOSMOS. Distance
estimates are derived for all stellar systems having SuperCOSMOS Sky
Survey 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 25pc. 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 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.
Description:
The USNO CCD Astrograph Catalog (UCAC) project finished observations
in late 2004 and has been producing astrometric catalogs since 2000
October.
UCAC3 (Zacharias et al. 2010, Cat I/315), released in 2009 August, is
the first in the series to contain coverage of the entire sky. UCAC3
also includes double star fitting and has a slightly deeper limiting
magnitude than UCAC2 due to a complete re-reduction of the pixel data.
In addition, data from the Two Micron All Sky Survey (2MASS) were used
in UCAC3 to probe for and reduce systematic errors in UCAC
observations, providing a greater number of reference stars to stack
up residuals as a function of many parameters, such as observing site
and exposure time. A detailed description of the astrometric
reductions of UCAC3 can be found in Finch et al. (2010AJ....139.2200F).