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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 114 181 Investigated very low-mass dwarfs and
proper-motion companions
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See also:
J/A+A/450/681 : Companions to close spectroscopic binaries (Tokovinin+, 2006)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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)
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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.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 17-Oct-2009