J/A+A/642/A179 beta Pictoris moving group RV of 81 stars (Miret-Roig+, 2020)
Dynamical traceback age of the β Pictoris moving group.
Miret-Roig N., Galli P.A.B., Brandner W., Bouy H., Barrado D., Olivares J.,
Antoja T., Romero-Gomez M., Figueras F., Lillo-Box J.
<Astron. Astrophys. 642, A179 (2020)>
=2020A&A...642A.179M 2020A&A...642A.179M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Radial velocities
Keywords: Galaxy: kinematics and dynamics - solar neighborhood -
stars: kinematics and dynamics - stars: formation -
open clusters and associations: individual: beta Pictoris
Abstract:
The β Pictoris moving group is one of the most well-known young
associations in the solar neighbourhood and several members are known
to host circumstellar discs, planets, and comets. Measuring its age
with precision is basic to study several astrophysical processes such
as planet formation and disc evolution which are strongly age
dependent.
We aim to determine a precise and accurate dynamical traceback age for
the β Pictoris moving group.
Our sample combines the extremely precise Gaia DR2 astrometry with
ground-based radial velocities measured in an homogeneous manner. We
use an updated version of our algorithm to determine dynamical ages.
The new approach takes into account a robust estimate of the spatial
and kinematic covariance matrices of the association to improve the
sample selection process and to perform the traceback analysis.
We estimate a dynamical age of 18.5-2.4+2.0Myr for the β
Pictoris moving group. We investigated the spatial substructure of the
association at birth time and we propose the existence of a core of
stars more concentrated. We also provide precise radial velocity
measurements for 81 members of β Pic, including ten stars with
the first determination of their radial velocities.
Our dynamical traceback age is three times more precise than previous
traceback age estimates and, more important, for the first time,
reconciles the traceback age with the most recent estimates of other
dynamical, lithium depletion boundary, and isochronal ages. This has
been possible thanks to the excellent astrometric and spectroscopic
precisions, the homogeneity of our sample, and the detailed analysis
of binaries and membership.
Description:
We analyse spectra from the FEROS, HARPS, ELODIE, SOPHIE, UVES, and
CAFE spectrographs. We refer to section 2 for a detailed description
of the observations and data analysis.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec7.dat 1519 81 Radial velocities measured in this study
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See also:
J/A+A/583/A85 : Binaries in beta Pic moving group (Alonso-Floriano+, 2015)
J/A+A/600/A83 : Photometry of beta Pic members (Messina+, 2017)
J/AJ/140/119 : βPic and AB Dor moving groups members (Schlieder+, 2010)
J/AJ/143/80 : R Low-mass stars of beta Pic & AB Dor groups (Schlieder+, 2012)
J/AJ/143/134 : Candidate members of β Pic/AB Dor groups (McCarthy+, 2012)
Byte-by-byte Description of file: tablec7.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- 2MASS 2MASS identifier (2MASS JHHMMSSss+DDMMSSs)
25- 26 I2 --- NSp [1/76] Number of spectra analysed
28- 45 A18 --- Inst Reference instruments
47- 52 F6.2 km/s allRV1 Radial velocity epoch 1
54- 59 F6.2 km/s allRV2 ? Radial velocity epoch 2
61- 66 F6.2 km/s allRV3 ? Radial velocity epoch 3
68- 73 F6.2 km/s allRV4 ? Radial velocity epoch 4
75- 80 F6.2 km/s allRV5 ? Radial velocity epoch 5
82- 87 F6.2 km/s allRV6 ? Radial velocity epoch 6
89- 94 F6.2 km/s allRV7 ? Radial velocity epoch 7
96- 101 F6.2 km/s allRV8 ? Radial velocity epoch 8
103- 107 F5.2 km/s allRV9 ? Radial velocity epoch 9
109- 113 F5.2 km/s allRV10 ? Radial velocity epoch 10
115- 119 F5.2 km/s allRV11 ? Radial velocity epoch 11
121- 125 F5.2 km/s allRV12 ? Radial velocity epoch 12
127- 131 F5.2 km/s allRV13 ? Radial velocity epoch 13
133- 136 F4.2 km/s allRV14 ? Radial velocity epoch 14
138- 142 F5.2 km/s allRV15 ? Radial velocity epoch 15
144- 148 F5.2 km/s allRV16 ? Radial velocity epoch 16
150- 153 F4.1 km/s allRV17 ? Radial velocity epoch 17
155- 158 F4.2 km/s allRV18 ? Radial velocity epoch 18
160- 163 F4.2 km/s allRV19 ? Radial velocity epoch 19
165- 168 F4.2 km/s allRV20 ? Radial velocity epoch 20
170- 174 F5.2 km/s allRV21 ? Radial velocity epoch 21
176- 180 F5.2 km/s allRV22 ? Radial velocity epoch 22
182- 186 F5.2 km/s allRV23 ? Radial velocity epoch 23
188- 191 F4.2 km/s allRV24 ? Radial velocity epoch 24
193- 196 F4.2 km/s allRV25 ? Radial velocity epoch 25
198- 201 F4.2 km/s allRV26 ? Radial velocity epoch 26
203- 206 F4.2 km/s allRV27 ? Radial velocity epoch 27
208- 211 F4.2 km/s allRV28 ? Radial velocity epoch 28
213- 215 F3.1 km/s allRV29 ? Radial velocity epoch 29
217- 220 F4.2 km/s allRV30 ? Radial velocity epoch 30
222- 225 F4.2 km/s allRV31 ? Radial velocity epoch 31
227- 230 F4.2 km/s allRV32 ? Radial velocity epoch 32
232- 235 F4.2 km/s allRV33 ? Radial velocity epoch 33
237- 240 F4.2 km/s allRV34 ? Radial velocity epoch 34
242- 245 F4.2 km/s allRV35 ? Radial velocity epoch 35
247- 249 F3.1 km/s allRV36 ? Radial velocity epoch 36
251- 254 F4.2 km/s allRV37 ? Radial velocity epoch 37
256- 259 F4.2 km/s allRV38 ? Radial velocity epoch 38
261- 264 F4.2 km/s allRV39 ? Radial velocity epoch 39
266- 269 F4.2 km/s allRV40 ? Radial velocity epoch 40
271- 274 F4.2 km/s allRV41 ? Radial velocity epoch 41
276- 279 F4.2 km/s allRV42 ? Radial velocity epoch 42
281- 283 F3.1 km/s allRV43 ? Radial velocity epoch 43
285- 288 F4.2 km/s allRV44 ? Radial velocity epoch 44
290- 293 F4.2 km/s allRV45 ? Radial velocity epoch 45
295- 298 F4.2 km/s allRV46 ? Radial velocity epoch 46
300- 303 F4.2 km/s allRV47 ? Radial velocity epoch 47
305- 308 F4.2 km/s allRV48 ? Radial velocity epoch 48
310- 312 F3.1 km/s allRV49 ? Radial velocity epoch 49
314- 317 F4.2 km/s allRV50 ? Radial velocity epoch 50
319- 322 F4.2 km/s allRV51 ? Radial velocity epoch 51
324- 326 F3.1 km/s allRV52 ? Radial velocity epoch 52
328- 331 F4.2 km/s allRV53 ? Radial velocity epoch 53
333- 336 F4.2 km/s allRV54 ? Radial velocity epoch 54
338- 341 F4.2 km/s allRV55 ? Radial velocity epoch 55
343- 346 F4.2 km/s allRV56 ? Radial velocity epoch 56
348- 351 F4.2 km/s allRV57 ? Radial velocity epoch 57
353- 356 F4.2 km/s allRV58 ? Radial velocity epoch 58
358- 361 F4.2 km/s allRV59 ? Radial velocity epoch 59
363- 366 F4.2 km/s allRV60 ? Radial velocity epoch 60
368- 371 F4.2 km/s allRV61 ? Radial velocity epoch 61
373- 375 F3.1 km/s allRV62 ? Radial velocity epoch 62
377- 380 F4.2 km/s allRV63 ? Radial velocity epoch 63
382- 385 F4.2 km/s allRV64 ? Radial velocity epoch 64
387- 390 F4.2 km/s allRV65 ? Radial velocity epoch 65
392- 395 F4.2 km/s allRV66 ? Radial velocity epoch 66
397- 400 F4.2 km/s allRV67 ? Radial velocity epoch 67
402- 405 F4.2 km/s allRV68 ? Radial velocity epoch 68
407- 410 F4.2 km/s allRV69 ? Radial velocity epoch 69
412- 415 F4.2 km/s allRV70 ? Radial velocity epoch 70
417- 420 F4.2 km/s allRV71 ? Radial velocity epoch 71
422- 425 F4.2 km/s allRV72 ? Radial velocity epoch 72
427- 430 F4.2 km/s e_allRV1 Error in radial velocity epoch 1
432- 435 F4.2 km/s e_allRV2 ? Error in radial velocity epoch 2
437- 440 F4.2 km/s e_allRV3 ? Error in radial velocity epoch 3
442- 445 F4.2 km/s e_allRV4 ? Error in radial velocity epoch 4
447- 450 F4.2 km/s e_allRV5 ? Error in radial velocity epoch 5
452- 455 F4.2 km/s e_allRV6 ? Error in radial velocity epoch 6
457- 460 F4.2 km/s e_allRV7 ? Error in radial velocity epoch 7
462- 465 F4.2 km/s e_allRV8 ? Error in radial velocity epoch 8
467- 470 F4.2 km/s e_allRV9 ? Error in radial velocity epoch 9
472- 475 F4.2 km/s e_allRV10 ? Error in radial velocity epoch 10
477- 480 F4.2 km/s e_allRV11 ? Error in radial velocity epoch 11
482- 485 F4.2 km/s e_allRV12 ? Error in radial velocity epoch 12
487- 490 F4.2 km/s e_allRV13 ? Error in radial velocity epoch 13
492- 495 F4.2 km/s e_allRV14 ? Error in radial velocity epoch 14
497- 500 F4.2 km/s e_allRV15 ? Error in radial velocity epoch 15
502- 505 F4.2 km/s e_allRV16 ? Error in radial velocity epoch 16
507- 510 F4.2 km/s e_allRV17 ? Error in radial velocity epoch 17
512- 515 F4.2 km/s e_allRV18 ? Error in radial velocity epoch 18
517- 520 F4.2 km/s e_allRV19 ? Error in radial velocity epoch 19
522- 525 F4.2 km/s e_allRV20 ? Error in radial velocity epoch 20
527- 530 F4.2 km/s e_allRV21 ? Error in radial velocity epoch 21
532- 535 F4.2 km/s e_allRV22 ? Error in radial velocity epoch 22
537- 540 F4.2 km/s e_allRV23 ? Error in radial velocity epoch 23
542- 545 F4.2 km/s e_allRV24 ? Error in radial velocity epoch 24
547- 550 F4.2 km/s e_allRV25 ? Error in radial velocity epoch 25
552- 555 F4.2 km/s e_allRV26 ? Error in radial velocity epoch 26
557- 560 F4.2 km/s e_allRV27 ? Error in radial velocity epoch 27
562- 564 F3.1 km/s e_allRV28 ? Error in radial velocity epoch 28
566- 569 F4.2 km/s e_allRV29 ? Error in radial velocity epoch 29
571- 574 F4.2 km/s e_allRV30 ? Error in radial velocity epoch 30
576- 579 F4.2 km/s e_allRV31 ? Error in radial velocity epoch 31
581- 583 F3.1 km/s e_allRV32 ? Error in radial velocity epoch 32
585- 588 F4.2 km/s e_allRV33 ? Error in radial velocity epoch 33
590- 593 F4.2 km/s e_allRV34 ? Error in radial velocity epoch 34
595- 597 F3.1 km/s e_allRV35 ? Error in radial velocity epoch 35
599- 602 F4.2 km/s e_allRV36 ? Error in radial velocity epoch 36
604- 607 F4.2 km/s e_allRV37 ? Error in radial velocity epoch 37
609- 612 F4.2 km/s e_allRV38 ? Error in radial velocity epoch 38
614- 617 F4.2 km/s e_allRV39 ? Error in radial velocity epoch 39
619- 621 F3.1 km/s e_allRV40 ? Error in radial velocity epoch 40
623- 626 F4.2 km/s e_allRV41 ? Error in radial velocity epoch 41
628- 631 F4.2 km/s e_allRV42 ? Error in radial velocity epoch 42
633- 636 F4.2 km/s e_allRV43 ? Error in radial velocity epoch 43
638- 641 F4.2 km/s e_allRV44 ? Error in radial velocity epoch 44
643- 646 F4.2 km/s e_allRV45 ? Error in radial velocity epoch 45
648- 651 F4.2 km/s e_allRV46 ? Error in radial velocity epoch 46
653- 656 F4.2 km/s e_allRV47 ? Error in radial velocity epoch 47
658- 661 F4.2 km/s e_allRV48 ? Error in radial velocity epoch 48
663- 666 F4.2 km/s e_allRV49 ? Error in radial velocity epoch 49
668- 671 F4.2 km/s e_allRV50 ? Error in radial velocity epoch 50
673- 676 F4.2 km/s e_allRV51 ? Error in radial velocity epoch 51
678- 681 F4.2 km/s e_allRV52 ? Error in radial velocity epoch 52
683- 686 F4.2 km/s e_allRV53 ? Error in radial velocity epoch 53
688- 691 F4.2 km/s e_allRV54 ? Error in radial velocity epoch 54
693- 696 F4.2 km/s e_allRV55 ? Error in radial velocity epoch 55
698- 701 F4.2 km/s e_allRV56 ? Error in radial velocity epoch 56
703- 706 F4.2 km/s e_allRV57 ? Error in radial velocity epoch 57
708- 711 F4.2 km/s e_allRV58 ? Error in radial velocity epoch 58
713- 716 F4.2 km/s e_allRV59 ? Error in radial velocity epoch 59
718- 721 F4.2 km/s e_allRV60 ? Error in radial velocity epoch 60
723- 726 F4.2 km/s e_allRV61 ? Error in radial velocity epoch 61
728- 731 F4.2 km/s e_allRV62 ? Error in radial velocity epoch 62
733- 736 F4.2 km/s e_allRV63 ? Error in radial velocity epoch 63
738- 741 F4.2 km/s e_allRV64 ? Error in radial velocity epoch 64
743- 746 F4.2 km/s e_allRV65 ? Error in radial velocity epoch 65
748- 751 F4.2 km/s e_allRV66 ? Error in radial velocity epoch 66
753- 756 F4.2 km/s e_allRV67 ? Error in radial velocity epoch 67
758- 761 F4.2 km/s e_allRV68 ? Error in radial velocity epoch 68
763- 766 F4.2 km/s e_allRV69 ? Error in radial velocity epoch 69
768- 771 F4.2 km/s e_allRV70 ? Error in radial velocity epoch 70
773- 776 F4.2 km/s e_allRV71 ? Error in radial velocity epoch 71
778- 781 F4.2 km/s e_allRV72 ? Error in radial velocity epoch 72
783- 791 F9.1 d JD1 Julian day in epoch 1
793- 801 F9.1 d JD2 ? Julian day in epoch 2
803- 811 F9.1 d JD3 ? Julian day in epoch 3
813- 821 F9.1 d JD4 ? Julian day in epoch 4
823- 831 F9.1 d JD5 ? Julian day in epoch 5
833- 841 F9.1 d JD6 ? Julian day in epoch 6
843- 851 F9.1 d JD7 ? Julian day in epoch 7
853- 861 F9.1 d JD8 ? Julian day in epoch 8
863- 871 F9.1 d JD9 ? Julian day in epoch 9
873- 881 F9.1 d JD10 ? Julian day in epoch 10
883- 891 F9.1 d JD11 ? Julian day in epoch 11
893- 901 F9.1 d JD12 ? Julian day in epoch 12
903- 911 F9.1 d JD13 ? Julian day in epoch 13
913- 921 F9.1 d JD14 ? Julian day in epoch 14
923- 931 F9.1 d JD15 ? Julian day in epoch 15
933- 941 F9.1 d JD16 ? Julian day in epoch 16
943- 951 F9.1 d JD17 ? Julian day in epoch 17
953- 961 F9.1 d JD18 ? Julian day in epoch 18
963- 971 F9.1 d JD19 ? Julian day in epoch 19
973- 981 F9.1 d JD20 ? Julian day in epoch 20
983- 991 F9.1 d JD21 ? Julian day in epoch 21
993-1001 F9.1 d JD22 ? Julian day in epoch 22
1003-1011 F9.1 d JD23 ? Julian day in epoch 23
1013-1021 F9.1 d JD24 ? Julian day in epoch 24
1023-1031 F9.1 d JD25 ? Julian day in epoch 25
1033-1041 F9.1 d JD26 ? Julian day in epoch 26
1043-1051 F9.1 d JD27 ? Julian day in epoch 27
1053-1061 F9.1 d JD28 ? Julian day in epoch 28
1063-1071 F9.1 d JD29 ? Julian day in epoch 29
1073-1081 F9.1 d JD30 ? Julian day in epoch 30
1083-1091 F9.1 d JD31 ? Julian day in epoch 31
1093-1101 F9.1 d JD32 ? Julian day in epoch 32
1103-1111 F9.1 d JD33 ? Julian day in epoch 33
1113-1121 F9.1 d JD34 ? Julian day in epoch 34
1123-1131 F9.1 d JD35 ? Julian day in epoch 35
1133-1141 F9.1 d JD36 ? Julian day in epoch 36
1143-1151 F9.1 d JD37 ? Julian day in epoch 37
1153-1161 F9.1 d JD38 ? Julian day in epoch 38
1163-1171 F9.1 d JD39 ? Julian day in epoch 39
1173-1181 F9.1 d JD40 ? Julian day in epoch 40
1183-1191 F9.1 d JD41 ? Julian day in epoch 41
1193-1201 F9.1 d JD42 ? Julian day in epoch 42
1203-1211 F9.1 d JD43 ? Julian day in epoch 43
1213-1221 F9.1 d JD44 ? Julian day in epoch 44
1223-1231 F9.1 d JD45 ? Julian day in epoch 45
1233-1241 F9.1 d JD46 ? Julian day in epoch 46
1243-1251 F9.1 d JD47 ? Julian day in epoch 47
1253-1261 F9.1 d JD48 ? Julian day in epoch 48
1263-1271 F9.1 d JD49 ? Julian day in epoch 49
1273-1281 F9.1 d JD50 ? Julian day in epoch 50
1283-1291 F9.1 d JD51 ? Julian day in epoch 51
1293-1301 F9.1 d JD52 ? Julian day in epoch 52
1303-1311 F9.1 d JD53 ? Julian day in epoch 53
1313-1321 F9.1 d JD54 ? Julian day in epoch 54
1323-1331 F9.1 d JD55 ? Julian day in epoch 55
1333-1341 F9.1 d JD56 ? Julian day in epoch 56
1343-1351 F9.1 d JD57 ? Julian day in epoch 57
1353-1361 F9.1 d JD58 ? Julian day in epoch 58
1363-1371 F9.1 d JD59 ? Julian day in epoch 59
1373-1381 F9.1 d JD60 ? Julian day in epoch 60
1383-1391 F9.1 d JD61 ? Julian day in epoch 61
1393-1401 F9.1 d JD62 ? Julian day in epoch 62
1403-1411 F9.1 d JD63 ? Julian day in epoch 63
1413-1421 F9.1 d JD64 ? Julian day in epoch 64
1423-1431 F9.1 d JD65 ? Julian day in epoch 65
1433-1441 F9.1 d JD66 ? Julian day in epoch 66
1443-1451 F9.1 d JD67 ? Julian day in epoch 67
1453-1461 F9.1 d JD68 ? Julian day in epoch 68
1463-1471 F9.1 d JD69 ? Julian day in epoch 69
1473-1481 F9.1 d JD70 ? Julian day in epoch 70
1483-1491 F9.1 d JD71 ? Julian day in epoch 71
1493-1501 F9.1 d JD72 ? Julian day in epoch 72
1503-1508 F6.2 km/s RVfinal Final radial velocity
1510-1514 F5.2 km/s e_RVfinal Error in final radial velocity
1516 A1 --- Binflag [Y/N] Binary flag (from literature)
1517 A1 --- TW [*] * indicates binaries identified
in this work
1519 A1 --- Contflag [Y/N] Kinematic contaminant flag
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Acknowledgements:
Nuria Miret-Roig, nuria.miret-roig(at)u-bordeaux.fr
(End) Patricia Vannier [CDS] 23-Jul-2020