J/ApJ/662/413 2MASS survey of wide multiplicity in 3 associations (Kraus+, 2007)
The role of mass and environment in multiple-star formation:
a 2MASS survey of wide multiplicity in three young associations.
Kraus A.L., Hillenbrand L.A.
<Astrophys. J., 662, 413-430 (2007)>
=2007ApJ...662..413K 2007ApJ...662..413K
ADC_Keywords: Associations, stellar ; Stars, double and multiple ;
Photometry, infrared
Keywords: binaries: visual - stars: low-mass, brown dwarfs -
stars: pre-main sequence
Abstract:
We present the results of a search for wide binary systems among 783
members of three nearby young associations: Taurus-Auriga, Chamaeleon
I, and two subgroups of Upper Scorpius. Near-infrared (JHK) imagery
from 2MASS was analyzed to search for wide (1"-30"; ∼150-4500AU)
companions to known association members, using color-magnitude cuts to
reject likely background stars. We identify a total of 131 candidate
binary companions with colors consistent with physical association, of
which 39 have not been identified previously in the literature.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 110 783 Confirmed Members of Nearby Young Associations
table3.dat 93 49 Close Pairs of Confirmed Association Members
table5.dat 91 82 Candidate Wide Binary Systems
table6.dat 108 72 Ultrawide Visual Companions
table7.dat 73 103 Inferred Binary Properties
refs.dat 103 42 References
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Source name (1)
28- 33 A6 --- Reg Source region (ChamI, Taurus, UScoA, or UScoB)
35- 36 I2 h RAh Hour of Right Ascension (J2000)
38- 39 I2 min RAm Minute of Right Ascension (J2000)
41- 45 F5.2 s RAs Second of Right Ascension (J2000)
47 A1 --- DE- Sign of the Declination (J2000)
48- 49 I2 deg DEd Degree of Declination (J2000)
51- 52 I2 arcmin DEm Arcminute of Declination (J2000)
54- 57 F4.1 arcsec DEs Arcsecond of Declination (J2000)
59- 63 F5.2 mag Kmag 2MASS K band magnitude
65- 68 F4.2 mag J-K 2MASS (J-K) color index
70- 74 F5.2 mag H-K 2MASS (H-K) color index
76- 80 A5 -- SpT Spectral type (from low-resolution spectra)
82- 86 F5.3 solMass Mass Estimated stellar Mass
88- 93 F6.3 --- chi3 The χ3 value (2)
95-100 F6.1 mas/yr pmRA ? USNO B1.0 proper motion along RA
102-107 F6.1 mas/yr pmDE ? USNO B1.0 proper motion along DE
109-110 I2 --- Ref Reference, in refs.dat files
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Note (1): RXJ 1502.9-2022 is a misprint for RX J1602.9-2022
RXJ 1551.1-2521 is a misprint for RX J1555.1-2521
Note (2): A statistic to measure how well each object is fit by
a single point source; see Section 3.2.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Primary source name
27- 50 A24 --- Name2 Secondary source name
51- 54 F4.2 mag (J-K)1 Primary 2MASS (J-K) color index
56- 59 F4.2 mag (H-K)1 Primary 2MASS (H-K) color index
61- 65 F5.2 mag Kmag1 Primary 2MASS K band magnitude
67- 70 F4.2 mag (J-K)2 Seconday 2MASS (J-K) color index
72- 75 F4.2 mag (H-K)2 Seconday 2MASS (H-K) color index
77- 81 F5.2 mag Kmag2 Seconday 2MASS K band magnitude
83- 87 F5.2 arcsec Sep Projected Separation
89- 93 F5.1 deg PA Position angle
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Source name
28- 31 F4.2 mag (J-K)1 Primary 2MASS (J-K) color index
33- 37 F5.2 mag (H-K)1 Primary 2MASS (H-K) color index
39- 43 F5.2 mag Kmag1 Primary 2MASS K band magnitude
45- 48 F4.2 mag (J-K)2 Seconday 2MASS (J-K) color index
50- 54 F5.2 mag (H-K)2 Seconday 2MASS (H-K) color index
56- 60 F5.2 mag Kmag2 Seconday 2MASS K band magnitude
62- 66 F5.2 arcsec Sep Projected Separation
68- 72 F5.1 deg PA Position angle
74- 77 I4 mas/yr pmRA ? USNO B1.0 proper motion along RA (1)
79- 82 I4 mas/yr pmDE ? USNO B1.0 proper motion along DE (1)
84- 86 A3 --- Met Identification method (2)
88- 89 I2 --- Ref ? Reference, in refs.dat files
91 A1 --- n_Ref [a] Note on ScoPMS052 B (3)
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Note (1): An entry of 0 for both pmRA and pmDE denotes a source which was
detected by the USNO-B survey, but did not show a significant proper
motion. A blank entry for both pmRA and pmDE denotes a source which
was not detected by the USNO-B survey.
Note (2): Identification method as follows:
PSC = 2MASS Point Source Catalog
PSF = PSF-fitting photometry
Note (3): 'a' indicates that ScoPMS052 B is also known as GSC06209-01312;
Martin et al. (1998MNRAS.300..733M 1998MNRAS.300..733M) identified it as a WTTS.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Source name
28- 31 F4.2 mag (J-K)1 Primary 2MASS (J-K) color index
33- 36 F4.2 mag (H-K)1 Primary 2MASS (H-K) color index
38- 42 F5.2 mag Kmag1 Primary 2MASS K band magnitude
44- 47 F4.2 mag (J-K)2 Seconday 2MASS (J-K) color index
49- 52 F4.2 mag (H-K)2 Seconday 2MASS (H-K) color index
54- 58 F5.2 mag Kmag2 Seconday 2MASS K band magnitude
60- 64 F5.2 arcsec Sep Projected Separation
66- 70 F5.1 deg PA Position angle
72- 74 I3 mas/yr pmRA ? USNO B1.0 proper motion along RA
76- 79 I4 mas/yr pmDE ? USNO B1.0 proper motion along DE
81-103 A23 --- Note Notes
105-106 I2 --- r_Note ? Reference for Note, in refs.dat files
108 A1 --- n_Note [abcd] Individual notes (1)
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Note (1): Flag on Ref as follows:
a = The source [CCE98] 2-26 is an ultrawide neighbor of both ChaHa7
and CHXR76; its physical association, if any, is uncertain.
b = Haro 6-5 B is a known member of Taurus (Mundt et al.,
1984A&A...140...17M 1984A&A...140...17M), but was not included as part of our
statistical sample because its spectral type is uncertain.
c = USco-160428.4-190441 B is also known as GSC06208-00611;
Preibisch et al. (1998, Cat. J/A+A/333/619) identified it as
a field star.
d = SCH16075850-20394890 B is also known as T64-2;
The (1964PASP...76..293T 1964PASP...76..293T) identified it as a strong Hα emitter.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Source name
28- 32 A5 --- SpT1 Primary spectral type
34- 38 F5.3 solMass Mass1 Primary mass
40- 44 A5 --- SpT2 Secondary spectral type (1)
46- 49 A4 --- SpT2f Secondary spectral type from
system flux ratio (1)(2)
51- 54 F4.2 solMass Mass2 ? Secondary mass (1)
56 A1 --- l_Mass2f Limit flag on
57- 61 F5.2 solMass Mass2f Secondary mass from system flux ratio (1)(2)
63- 66 I4 AU Sep Projected separation (1)
68 A1 --- l_q Limit flag on q
69- 73 F5.2 --- q Mass ratio (1)
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Note (1): Estimated statistical uncertainties are ∼10% for mass ratios,
∼20% for secondary masses, ∼2-3 subclasses for spectral types, and
∼10% for projected separations.
Note (2): Estimated from the system flux ratio ΔJ and the
spectroscopically determined properties of the primary.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 45 A22 --- Aut Author's name
47-103 A57 --- Com Comments
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History:
* From electronic version of the journal
* 11-Jul-2009: Names homogenized between the different tables
* 08-Apr-2011: 14 names of table2 corrected (previous version available
as file "table2.v01")
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-May-2009