J/AJ/141/52 Low-mass visual companions to nearby G-dwarfs (Tokovinin, 2011)
Low-mass visual companions to nearby G-dwarfs.
Tokovinin A.
<Astron. J., 141, 52 (2011)>
=2011AJ....141...52T 2011AJ....141...52T
ADC_Keywords: Stars, double and multiple ; Stars, nearby ; Stars, G-type ;
Stars, dwarfs
Keywords: binaries: general
Abstract:
A complete census of wide visual companions to nearby G-dwarf stars
can be achieved by selecting candidates from the Two Micron All Sky
Survey (2MASS) Point-Source Catalog and checking their status by
second-epoch imaging. Such data are obtained for 124 candidates with
separations up to 20", 47 of which are shown to be new physical
low-mass stellar companions. A list of visual binaries with G-dwarf
primaries is produced by combining newly found companions with
historical data.
Description:
Simultaneous images in the visible and IR were taken at the CTIO 1.3m
telescope (the telescope used in 2MASS) with the ANDICAM instrument.
Observations were carried out in 2010 February-March (2010.09 to
2010.19).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 124 Companion measurements (2010.14)
table2.dat 78 221 Photometry and companion status
table3.dat 80 227 Notes on individual targets
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- HIP Hipparcos identification number
7- 8 A2 --- Sys [AB AC AD] Binary pair identification
10- 14 F5.2 arcsec 2Sep 2MASS separation
16- 20 F5.1 deg 2PA 2MASS position angle
22- 26 F5.2 mag 2DKmag 2MASS Ks band magnitude difference
28 A1 --- 2Q [A-EU] 2MASS quality flag in the Ks band
30- 34 F5.2 arcsec KSep ANDICAM Ks band separation
36- 40 F5.1 deg KPA ANDICAM Ks band position angle
42- 46 F5.2 mag KDKmag ANDICAM Ks band magnitude difference
48 A1 --- n_KDKmag [S] ANDICAM Ks band primary saturated?
50- 54 F5.2 arcsec VSep ? ANDICAM V band separation
56- 60 F5.1 deg VPA ? ANDICAM V band position angle
62- 65 F4.2 mag VDVmag ? ANDICAM V band magnitude difference
67 A1 --- n_VDVmag [S] ANDICAM V band primary saturated?
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- HIP Hipparcos identification number
7- 10 F4.1 mas plx Hipparcos parallax
12- 14 I3 --- Num Number of companions within 2.5' from primary
16- 20 F5.2 mag Vmag Primary Hipparcos/Tycho catalog V band magnitude
22- 25 F4.2 mag Jmag Primary 2MASS J band magnitude
27- 30 F4.2 mag Kmag Primary 2MASS Ks band magnitude
32- 35 F4.2 Msun M1 Primary target mass
37 A1 --- Comp [BCD] Companion identification
39- 43 F5.2 arcsec Sep 2MASS separation
45- 47 I3 deg PA 2MASS position angle
49- 53 F5.2 mag CVmag ? Companion V band magnitude; see text
55- 59 F5.2 mag CJmag Companion 2MASS J band magnitude
61- 65 F5.2 mag CKmag Companion 2MASS Ks band magnitude
67- 70 F4.2 Msun M2 Companion mass
72- 73 I02 --- WA [00/11] Companion flag (1)
75- 78 F4.1 --- O [-2.0/2.0] Opticity flag, >0 for physical pair (2)
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Note (1): The flag W=1 is set if the companion is known (e.g. found in the
WDS), flag A=1 means that the companion was observed with ANDICAM.
Note (2): -2 and -1 for certain or almost certain optical companions, +1
and +2 for very likely and certain physical companions.
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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- 5 I5 --- HIP Hipparcos identification number
7- 80 A74 --- Notes Additional notes
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-Jul-2012