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J/ApJ/667/520        Proper motions in multiple systems        (Caballero, 2007)

Southern very low mass stars and brown dwarfs in wide binary and multiple systems. Caballero J.A. <Astrophys. J., 667, 520-526 (2007)> =2007ApJ...667..520C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Proper motions Keywords: binaries: visual - stars: formation - stars: individual (2MASS J23310161-0406193 AB, HD 221356, LP 655-23) - stars: low-mass, brown dwarfs Abstract: The results of the Koenigstuhl survey in the Southern Hemisphere are presented. I have searched for common proper motion companions to 173 field very low mass stars and brown dwarfs with spectral types >M5.0 V and magnitudes J≲14.5mag. I have measured for the first time the common proper motion of two new wide systems containing very low mass components, Koenigstuhl 2 AB and 3 A-BC. Together with Koenigstuhl 1 AB and 2M 0126-50 AB, they are among the widest systems in their respective classes (r=450-11900AU). I have determined the minimum frequency of field wide multiples (r>100AU) with late-type components at 5.0%±1.8% and the frequency of field wide late-type binaries with mass ratios q>0.5 at 1.2%±0.9%. These values represent a key diagnostic of evolution history and low-mass star and brown dwarf formation scenarios. In addition, the proper motions of 62 field very low mass dwarfs are measured here for the first time. Description: I have performed a proper-motion survey, called Koenigstuhl, using the United Kingdom Schmidt Telescope (UKST) and Palomar Observatory Sky Survey I (POSS-I) plates and the SuperCOSMOS Science Archive (SSA). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 114 181 Investigated very low-mass dwarfs and proper-motion companions
See also: J/A+A/450/681 : Companions to close spectroscopic binaries (Tokovinin+, 2006) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 25 A25 --- Name Object name 27- 32 A6 --- m_Name Component identification 34- 49 A16 --- Aname Alternative name 51- 52 I2 h RAh Hour of Right Ascension (J2000) 54- 55 I2 min RAm Minute of Right Ascension (J2000) 57- 60 F4.1 s RAs Second of Right Ascension (J2000) 62 A1 --- DE- Sign of the Declination (J2000) 63- 64 I2 deg DEd Degree of Declination (J2000) 66- 67 I2 arcmin DEm Arcminute of Declination (J2000) 69- 70 I2 arcsec DEs Arcsecond of Declination (J2000) 72- 78 F7.1 mas/yr pmRA Proper motion in RA*cos(DE) (1) 80- 85 F6.1 mas/yr e_pmRA Error in pmRA (1) 86 A1 --- u_pmRA Uncertainty flag on pmRA 88- 94 F7.1 mas/yr pmDE Proper motion in DE (1) 96-101 F6.1 mas/yr e_pmDE Error in pmDE (1) 102 A1 --- u_pmDE Uncertainty flag on pmDE 104-110 A7 --- SpType MK spectral type 112-114 A3 --- n_Name Additional remark(s) (2)
Note (1): In units of milli-arcseconds per year. Note (2): Notes as follows: 1 = first proper motion measurement 2 = double detection in SSA 3 = high δµ/µ ratio 4 = proper motion from the literature.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 17-Oct-2009
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