Access to Astronomical Catalogues

← Click to display the menu
J/AJ/129/2420       Proper motion derivatives of binaries    (Makarov+, 2005)

Statistical constraints for astrometric binaries with nonlinear motion. Makarov V.V., Kaplan G.H. <Astron. J., 129, 2420-2427 (2005)> =2005AJ....129.2420M
ADC_Keywords: Stars, double and multiple ; Proper motions ; Parallaxes, trigonometric Keywords: astrometry - binaries: general Abstract: Useful constraints on the orbits and mass ratios of astrometric binaries in the Hipparcos catalog are derived from the measured proper motion differences of Hipparcos and Tycho-2 (Δµ), accelerations of proper motions (dµ/dt) and second derivatives of proper motions (d2µ/dt2). It is shown how, in some cases, statistical bounds can be estimated for the masses of the secondary components. Two catalogs of astrometric binaries are generated, one of binaries with significant proper motion differences and the other of binaries with significant accelerations of their proper motions. Description: table1.dat catalog includes Hipparcos stars with proper motions significantly different in the Hipparcos and Tycho-2 astrometric catalogs, suspected to be long-period astrometric binaries. Derived quantities Q0 are given for each star that are statistically related to the mass ratio. table2.dat catalog includes Hipparcos stars with accelerating proper motions, suspected to be long-period astrometric binaries. Derived quantities Q1 are given for each star that are statistically related to the mass ratio. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 95 1929 A catalog of astrometric binaries with discrepant proper motions in Hipparcos and Tycho-2 table2.dat 114 2622 A catalog of astrometric binaries with accelerating proper motions in Hipparcos
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP [68/118213] HIP (I/239) number 8- 11 I4 --- TYC1 TYC-1 (I/239) identification 13- 17 I5 --- TYC2 TYC-2 (I/239) identification 19 I1 --- TYC3 TYC-3 (I/239) identification 21- 27 F7.1 mas/yr pmRA Proper motion from HIP, mualpha*cos(delta) 29- 35 F7.1 mas/yr pmDE Proper motion from HIP, mudelta 37- 41 F5.1 mas/yr e_pmRA Error of HIP proper motion 43- 47 F5.1 mas/yr e_pmDE Error of HIP proper motion 49- 55 F7.1 mas/yr pmRAT Proper motion from Tycho-2, mualpha*cos(delta) 57- 63 F7.1 mas/yr pmDET Proper motion from Tycho-2, mudelta 65- 69 F5.1 mas/yr e_pmRAT Error of Tycho-2 proper motion 71- 75 F5.1 mas/yr e_pmDET Error of Tycho-2 proper motion 77- 81 F5.1 mas plx HIP trigonometric parallax 83- 86 F4.1 mas e_plx Error of HIP parallax 88 A1 --- Flag [A] Acceleration flag 90- 93 F4.1 [yr-1] logQ0 Q0 factor (1) 95 A1 --- u_plx [U] Uncertain parallax
Note (1): Parameter used to identify Δµ binaries. Q0= (Δmu)/(2π*plx)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP [62/118286] HIP (I/239) number 8- 11 I4 --- TYC1 ? TYC-1 (I/239) identification 13- 17 I5 --- TYC2 ? TYC-2 (I/239) identification 19 I1 --- TYC3 ? TYC-3 (I/239) identification 21- 27 F7.2 mas/yr+2 dpmRA/dt Acceleration from HIP, d(mualpha*cosδ)/dt 29- 35 F7.2 mas/yr+2 dpmDE/dt Acceleration from HIP, d(mudelta)/dt 37- 43 F7.2 mas/yr+2 e_dpmRA/dt Errors of HIP acceleration 45- 51 F7.2 mas/yr+2 e_dpmDE/dt Errors of HIP acceleration 53- 57 F5.2 --- Sig Significance level 59- 65 F7.2 mas/yr+3 d2pmRA/dt2 ? Second derivatives of proper motion from HIP, d2(mualpha*cosδ)/dt2 67- 73 F7.2 mas/yr+3 d2pmDE/dt2 ? Second derivatives of proper motion from HIP, d2(mudelta)/dt2 75- 81 F7.2 mas/yr+3 e_d2pmRA/dt2 ? Error of HIP second derivatives 83- 89 F7.2 mas/yr+3 e_d2pmDE/dt2 ? Error of HIP second derivatives 91- 95 F5.2 ---- Sig2 ? Significance level 96-100 F5.1 mas plx HIP trigonometric parallax 102-105 F4.1 mas e_plx Error of HIP parallax 107 A1 --- Flag [M] δµ flag 109-112 F4.1 [yr-2] logQ1 Q1 factor (1) 114 A1 --- u_plx [U] Uncertain parallax
Note (1): Parameter used to identify dmu/dt binaries. Q1= (dmu/dt)/(4π2*plx)
Acknowledgements: Valeri Makarov, Valeri.V.Makarov-119624(at)jpl.nasa.gov
(End) Patricia Vannier [CDS] 17-May-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact