J/AJ/140/844 UCAC3 proper motion survey (Finch+, 2010)
UCAC3 proper motion survey. I. Discovery of new proper motion stars in UCAC3 with 0.40"/yr>µ≥0.18"/yr between declinations -90° and -47°. Finch C.T., Zacharias N., Henry T.J. <Astron. J., 140, 844-869 (2010)> =2010AJ....140..844F
ADC_Keywords: Stars, nearby ; Proper motions ; Surveys ; Photometry ; Stars, distances Keywords: astrometry - solar neighborhood - stars: distances - stars: statistics - surveys Abstract: This paper presents 442 new proper motion stellar systems in the southern sky between declinations -90° and -47° with 0.40"/yr>µ≥0.18"/yr. These systems constitute a 25.3% increase in new systems for the same region of the sky covered by previous SuperCOSMOS RECONS (SCR) searches that used Schmidt plates as the primary source of discovery. Among the new systems are 25 multiples, plus an additional 7 new common proper motion (CPM) companions to previously known primaries. All stars have been discovered using the third U.S. Naval Observatory (USNO) CCD Astrograph Catalog (UCAC3). A comparison of the UCAC3 proper motions to those from the Hipparcos, Tycho-2, Southern Proper Motion (SPM4), and SuperCOSMOS efforts is presented and shows that UCAC3 provides similar values and precision to the first three surveys. Description: The UCAC project has been producing astrometric catalogs since 2000 October, with the first release (UCAC1; Zacharias et al. 2000, Cat. I/268) covering only 80% of the southern sky. The second catalog in this series (UCAC2; Zacharias et al. 2004, Cat. I/289) was released in 2003 July with about the same level of completeness as UCAC1, but with early epoch plates paired with the Astrograph CCD data for improved proper motions. The UCAC3, released in 2009 August, is the first from the series to have all sky coverage, and contains just over 100 million entries with a limiting magnitude of ∼16 in the UCAC bandpass (579-642nm). 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 (Zacharias et al. 2010, Cat. I/315). A detailed introduction to the UCAC3 can be found in the released paper (Zacharias et al. 2010, Cat. I/315) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 127 474 New UCAC3 high proper motion systems between declinations -90° and -47° with 0.40"/yr>µ≥0.18"/yr table4.dat 104 33 Common Proper Motion (CPM) candidate systems
See also: I/268 : UCAC1 Catalogue (Zacharias+ 2000) I/289 : UCAC2 Catalogue (Zacharias+ 2004) I/315 : UCAC3 Catalogue (Zacharias+ 2009) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 A1 --- Flag [*a] Position flag (added by CDS) (1) 3- 5 A3 --- --- [UPM] 7- 15 A9 --- UPM Source name (HHMM-DDMM) 16 A1 --- m_UPM [ABC] Multiplicity index on UPM name 18- 27 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) (1) 29- 38 F10.6 deg DEdeg Declination in decimal degrees (J2000) (1) 40- 45 F6.1 mas/yr pmRA ? Proper motion along RA (*cos(DE)) 47- 52 F6.1 mas/yr pmDE ? Proper motion along DE 54- 57 F4.1 mas/yr e_pmRA ? The 1σ uncertainty in pmRAcosDE 59- 62 F4.1 mas/yr e_pmDE ? The 1σ uncertainty in pmDE 64- 69 F6.3 mag Bmag ? SuperCOSMOS BJ plate magnitude 71- 76 F6.3 mag Rmag ? SuperCOSMOS R59F plate magnitude 78- 83 F6.3 mag Imag ? SuperCOSMOS IIVN plate magnitude 85- 90 F6.3 mag Jmag ? 2MASS J band magnitude 92- 97 F6.3 mag Hmag ? 2MASS H band magnitude 99-104 F6.3 mag Ksmag ? 2MASS Ks band magnitude 106-111 F6.3 mag R-J ? The (R59F-J) color index 113-117 F5.1 pc Dist ? Estimated distance (G1) 118 A1 --- f_Dist Indicates a presumably incorrect Dist 120-126 A7 --- Notes Additional note(s) (2) 127 A1 --- T3 [*] * for systems estimated to be within 25pc (originally listed in table3)
Note (1): Original values are South Polar distances (not declinations). RAdeg and DEdeg have been retrieved from UCAC3 at CDS. * = source not in UCAC3, companion of UCAC3 source. In that case, the position is those of the UCAC3 companion. a = source not in UCAC3. In that case, RAdeg from original table RA, DEdeg from UPM name Note (2): Notes as follows: a = Subdwarf candidate picked from RPM diagram; plate distance, see f_Dist column, is incorrect. b = Number of relations used for distance estimate <6, plate distance less reliable. c = Common proper motion companion; see table4.dat. d = Not detected during automated search but noticed by eye during the blinking process. e = Proper motions suspect. f = Possible NLTT star with a position difference >90" when compared to UCAC3 position. g = Source not in 2MASS. h = SuperCOSMOS plate magnitudes suspect.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name1 Primary name 16- 21 F6.1 mas/yr pmRA1 Proper motion along RA(*cos(DE)) of primary 23- 28 F6.1 mas/yr pmDE1 Proper motion along DE 30- 34 F5.1 pc Dist1 ? Distance of primary (GA) 36- 49 A14 --- Name2 Secondary (or tertiary for NLTT 19906) name 51- 56 F6.1 mas/yr pmRA2 ?=- Proper motion along RA(*cos(DE)) of the secondary/tertiary 58- 63 F6.1 mas/yr pmDE2 ?=- Secondary or tertiary name of the secondary/tertiary 65- 69 F5.1 pc Dist2 ?=- Distance of secondary (G1) 70 A1 --- f_Dist2 ] Indicates a presumably incorrect Dist2 72- 76 F5.1 arcsec Sep Separation relative to the primary 78- 82 F5.1 deg theta Position angle relative to the primary 84- 90 A7 --- Notes Notes (1) 92- 94 A3 --- --- [UPM] 96-104 A9 --- UPM System name (UPM HHMM-DDMM)
Note (1): Notes as follows: a = Not detected during automated search but noticed by eye during the blinking process. b = Possible NLTT star with a position difference >90" when compared to UCAC3 position. c = White dwarf, estimated distance [in bracket] is incorrect. A more accurate distance is 34.2pc. d = Number of relations used for distance estimate <6; plate distance less reliable. e = Source not in 2MASS. f = Proper motions suspect. g = SuperCOSMOS plate magnitudes suspect.
Global notes: Note (G1): Distance estimates are computed from the 11 colors generated from the six-band photometry (Hambly et al. 2004AJ....128..437H), assuming that all objects are main-sequence stars. The accuracy reported for this technique is roughly 26%
History: * 22-Jul-2012: From electronic version of the journal * 10-Jan-2013: in table2, right ascension and declination in degrees.
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jun-2012
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