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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
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, 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:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 94 131 Catalog data
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
Bytes Format Units Label Explanations
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 <a> *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
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 <a>: 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) 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). Golimowski et al. (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). Lower bound to magnitude of secondary estimated from its mass.
Acknowledgements: Miguel Angel Herrera
(End) Patricia Bauer [CDS] 11-Jan-2000
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