J/A+A/356/529 Catalogue of wide binaries (Allen+ 2000)
Wide binaries among high-velocity and metal-poor stars
Allen, C., Poveda, A., Herrera, M.A.
<Astron. Astrophys. 356, 529 (2000)>
=2000A&A...356..529A 2000A&A...356..529A
ADC_Keywords: Stars, double and multiple ; Magnitudes ; Abundances, [Fe/H]
Keywords: catalogs - stars: binaries: general - stars: Population II -
Galaxy: halo
Description:
The list contains a total of 131 binaries (115 systems) belonging to
the halo or high-velocity disk. Of these, 122 correspond to wide
binaries, that is, binaries with expected major semiaxes larger than
25 AU. The catalogue was constructed by identifying common
proper-motion companions to the high-velocity and metal-poor stars
studied by Schuster and collaborators (SN: Schuster and Nissen
1988A&AS...73..225S 1988A&AS...73..225S, SPC: Schuster, Parrao and Contreras, 1993, Cat.
J/A+AS/97/951). Based on Stromgren photometry, Schuster et al.
obtained distances, metallicities and ages for their stars. For each
star of the SN and SPC catalogues a machine search for common
proper-motion companions was made among the NLTT (Cat. I/98) stars
within 12 minutes of arc. This initial list was checked to avoid
errors due to misidentifications, duplicate entries, etc., and was
supplemented with some companions listed in the LDS (Luyten, 1987,
Cat. I/130) and not present in the NLTT (mostly from the southern
hemisphere), as well as with additional common-proper- motion
companions found in the CCDM (Dommanget and Nys, 1994, Cat. I/211).
Additional close companions found in the CCDM were retained only if an
orbit was given, or if their separations were of less than 1". Wider
companions were usually eliminated, unless convincing evidence of
their sharing the proper motion of the primary was found. Distances to
the primaries were updated using the Hipparcos (Cat. I/239)
catalogue.
The data in the list are as follows (for details see the main paper):
The first column contains the Hipparcos number, when available. Column
2 contains other identifications of the star. In the third column its
multiplicity is indicated. Column 4 contains the adopted distance to
the star. Columns 5 and 6 contain the absolute visual magnitudes of
the primary and secondary, respectively. The angular separation
between the components is given in Column 7, and the expected value of
the major semiaxes in Column 8. Columns 9 and 10 contain the
metallicity of the primary and its age, as determined by Schuster and
collaborators. The individual ages listed were kindly provided by W.
J. Schuster. The peculiar velocity of the binary is given in Column
11. Columns 12 to 15 contain the main galactic orbital parameters; we
list the apocentric distance, Rmax, as well as the maximum distance
away from the galactic plane reached by the star |zmax|, and the
three-dimensional eccentricity e of its galactic orbit. The last
column contains various notes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 94 131 Catalog data
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/130 : LDS. Doubles with Common Proper Motion (Luyten 1940-87)
I/211 : CCDM, Components of Double and Multiple stars (Dommanget+ 1994)
V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)
I/98 : NLTT Catalogue (Luyten, 1979)
J/A+AS/97/951 : uvby-beta photometry of metal-poor stars (Schuster+ 1993)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP ? Hipparcos (Cat. I/239) number
7 A1 --- u_HIP [)] Uncertainty flag on HIP
9- 16 A8 --- Id Other identification
17 I1 --- N Multiplicity
19- 23 F5.1 pc Dist *Distance
25- 28 F4.1 --- VMAGp *Absolute visual magnitude of primary
30 A1 --- l_VMAGs Limit flag on VMAGs
31- 34 F4.1 --- VMAGs *Absolute visual magnitude of secondary
36- 42 F7.3 arcsec Sep *Angular separation
44- 53 F10.3 AU *Expected major semiaxis
55- 59 F5.2 --- [Fe/H] ? Metallicity
61- 64 F4.1 Gyr Age *? Age
66- 70 F5.1 km/s Vp *? Total space velocity with respect to LSR
72- 75 F4.1 kpc Rmax ? Maximum galactocentric distance
77- 81 I5 pc |zmax| ? Maximum height over galactic plane
83- 86 F4.2 --- e ? Three-dimensional eccentricity
88- 89 A2 --- Pop *Population
91- 93 A3 --- Notes *Notes
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Note on Dist:
Distances to the primaries were updated using the Hipparcos catalogue.
Hipparcos distances were adopted for those stars with relative errors in
their trigonometric parallaxes of less than 15%. For stars with larger
errors, the photometric distances kindly provided by W. J. Schuster were
retained.
Note on VMAGp:
Absolute visual magnitude for the primaries were calculated from the adopted
distances and the apparent visual magnitudes given by Schuster and
collaborators (in SN and SPC).
Note on VMAGs:
Absolute visual magnitudes for the secondaries were calculated from the
apparent red and photographic (blue) magnitude differences between the
components Delta(mR), Delta(mB), as estimated by Luyten. These Delta(m) were
transformed to visual magnitude differences by means of relations derived
for those NLTT stars that also have reliable photometry in the visual band,
as listed in the Gliese-Jahreiss catalogue (1991, Cat. V/70). The
relations for main- sequence stars are (Lavalley, 1994, Bachelor's Thesis,
UNAM, p.93):
Delta(VB) = 0.972Delta(mB), Delta(VR) = 1.055Delta(mR).
The absolute visual magnitudes of the secondaries were then calculated from
those of the primaries by adding the calculated
Delta(V) = 1/2(Delta(VB)+Delta(VR)).
Note on Sep:
Angular separations between the components were mostly taken from the
Notes of the NLTT (Cat. I/98), supplemented by the LDS (Cat. I/130),
the Gliese-Jahreiss (1991, Cat. V/70) catalogue, and the
CCDM (Cat. I/211).
Note on :
Linear separations between the components were calculated from the angular
separations and the adopted distances. The linear separations were
transformed into expected values for the major semiaxes by means of the
statistical relation (Couteau, 1960JO.....43....1C 1960JO.....43....1C)
E(log a) - E(log s) = 0.146.
Note on Age:
The individual ages listed were kindly provided by W. J. Schuster.
Note on Vp:
To compute the peculiar velocities a solar motion of (9,12,7) km/s was
assumed. Radial velocities were taken from various sources in the
literature. Detailed references are given in Nissen and Schuster,
19991A&A...251..457N and in SPC 1993 (Cat. J/A+AS/97/951).
Note on Pop:
d: old disk
td: thick disk
h: halo
Note on Notes:
O Orbit available. The actual value of a is listed.
1 Distance from Schuster et al. (1993, Cat. J/A+AS/97/951)
2 Distance from Hipparcos. (Cat. I/239)
3 Visual magnitude of secondary estimated by Lippincott
(1969BAAS....1..199L 1969BAAS....1..199L).
Golimowski et al. (1995ApJ...444L.101G 1995ApJ...444L.101G) obtain Mk = 9.5.
4 Hipparcos number corresponds to secondary.
5 Galactic orbit is chaotic.
6 Orbits computed by Strand (1957AJ.....62...35S 1957AJ.....62...35S). Lower bound to magnitude
of secondary estimated from its mass.
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Acknowledgements: Miguel Angel Herrera
(End) Patricia Bauer [CDS] 11-Jan-2000