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J/ApJS/192/2      A Bayesian search for binaries in Hipparcos     (Shaya+, 2011)

Very wide binaries and other comoving stellar companions: a Bayesian analysis of the Hipparcos catalogue. Shaya E.J., Olling R.P. <Astrophys. J. Suppl. Ser., 192, 2 (2011)> =2011ApJS..192....2S
ADC_Keywords: Stars, double and multiple ; Proper motions ; Radial velocities Keywords: binaries: visual - catalogs - dark matter - proper motions - stars: statistics Abstract: We develop Bayesian statistical methods for discovering and assigning probabilities to non-random (e.g., physical) stellar companions. These companions are either presently bound or were previously bound. The probabilities depend on similarities in corrected proper motion parallel and perpendicular to the brighter component's motion, parallax, and the local phase-space density of field stars. Control experiments are conducted to understand the behavior of false positives. The technique is applied to the Hipparcos Catalogue (Cat. I/239) within 100pc. This is the first all-sky survey to locate escaped companions still drifting along with each other. In the <100pc distance range, ∼220 high probability companions with separations between 0.01 and 1pc are found. The first evidence for a population (∼300) of companions separated by 1-8pc is found. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 177 255 Candidate companions for 111 candidate primaries within 25pc table4.dat 177 581 Candidate companions for 265 candidate primaries between 25 and 50pc table5.dat 177 968 Candidate companions for 464 candidate primaries between 50 and 100pc
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) I/259 : The Tycho-2 Catalogue (Hog+ 2000) Byte-by-byte Description of file: table[345].dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/840] System index number 5- 10 I6 --- HIP HIP (Cat. I/239) number of star 12- 17 I6 --- HIP1 ? HIP number of primary (if HIP is not primary) 19- 23 F5.1 deg GLon HIP catalog Galactic longitude 25- 29 F5.1 deg GLat HIP catalog Galactic latitude 31- 35 F5.2 mag Vmag HIP visual magnitude 37- 39 I3 --- n_Vmag ? Vmag brightness ranking within the table 41- 46 A6 --- SpT Simbad MK spectral type 48- 50 A3 --- OType Simbad other object type (1) 52- 58 F7.1 mas/yr pmLon Proper motion along GLon (2) 60- 66 F7.1 mas/yr pmLat Proper motion along GLat (2) 68- 72 F5.1 mas/yr dpmLon ? Proper motion difference along GLon (3) 74- 78 F5.1 mas/yr e_dpmLon ? Uncertainty in dpmGLon 80- 84 F5.1 mas/yr dpmLat ? Proper motion difference along GLat (3) 86- 90 F5.1 mas/yr e_dpmLat ? Uncertainty in dpmGLat 92- 95 F4.1 pc Dist HIP2 (Cat. I/311) distance (obtained from the inverse of parallax) 97-100 F4.1 pc e_Dist Uncertainty in Dist 102-107 F6.1 km/s RV ? Radial velocity from literature (4) 109-114 F6.1 km/s dRV ? Radial velocity difference (5) 116-119 F4.1 km/s e_dRV ? Uncertainty in dRV 121-125 F5.2 Msun Mass Estimated mass (6) 127-132 F6.4 pc dR ? Projected radial separation (blank for primary) 134-137 F4.2 --- Prob [0/1]? Probability candidate is true companion 138 A1 --- --- [0] 140-177 A38 --- Com Additional comment(s) (7)
Note (1): One of 10 possible types on the basis of the 67 "Other object type" identifications in SIMBAD (such as, "*in**," "EB," "YSO," mean: "star in double star," "Eclipsing binary" and "young stellar object," respectively). Codes as follows: UnK = not known, SpB = spectroscopic binary, EcB = eclipsing binary, BiN = other binary, RoT = star with high rotation velocity, VaR = variable star, YnG = young/pre-MS star, ClN = star in cluster of nebula, F/E = flare or eruptive star, OtH = generic star or other object. Note (2): From Tycho-2 (Cat. I/259) when available otherwise from HIP (Cat. I/311). Note (3): Difference with the primary star (value is blank for the primary). Corrected for geometric effects as described in Section 3.2 Note (4): The data is taken from the six catalogs enumerated below: Simbad database; GCRV (Barbier-Brossat & Figon 2000, Cat. III/213); BCRV (Malaroda et al. 2000, Cat. III/249); GCSN (Nordstrom et al. 2004, Cat. V/117) and RAVE (Zwitter et al. 2008, Cat. III/257). Note (5): From the space velocity translated to the position of the primary. Is blank for the line corresponding to the primary star. Note (6): Based solely on stellar color (B-V), via the mass-luminosity-color relation for the main-sequence. See section 4.2 for further details. Note (7): The Bayer-Flamsteed (BF) designations and common names for the stars.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-Mar-2011
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