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J/A+A/615/A49  TGAS stars membership in 128 open clusters (Cantat-Gaudin+, 2018)

Characterising open clusters in the solar neigbourhood with the Tycho-Gaia astrometric solution. Cantat-Gaudin T., Vallenari A., Sordo R., Pensabene F., Krone-Martins A., Moitinho A., Jordi C., Casamiquela L., Balaguer-Nunez L., Soubiran C., Brouillet N. <Astron. Astrophys. 615, A49 (2018)> =2018A&A...615A..49C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Positional data Keywords: galaxies: star clusters: general - methods: numerical Abstract: The Tycho-Gaia Astrometric Solution (TGAS) subset of the first Gaia catalogue contains an unprecedented sample of proper motions and parallaxes for two million stars brighter than G∼12 mag. We take advantage of the full astrometric solution available for those stars to identify the members of known open clusters and compute mean cluster parameters using either TGAS or UCAC4 proper motions, and TGAS parallaxes. We apply an unsupervised membership assignment procedure to select high probability cluster members, we use a Bayesian/MCMC technique to fit stellar isochrones to the observed 2MASS JHK magnitudes of the member stars and derive cluster parameters (age, metallicity, extinction, distance modulus), and we combine TGAS data with spectroscopic radial velocities to compute full Galactic orbits. We obtain mean astrometric parameters (proper motions and parallaxes) for 128 clusters closer than about 2kpc, and cluster parameters from isochrone fitting for 26 of them located inside 1kpc from us. We show the orbital parameters obtained from integrating 36 orbits in a Galactic potential. Description: A list of TGAS sources (along with their proper motions in the UCAC4 catalogue and 2MASS photometry) and their membership probability as derived in this study. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file members.dat 596 241711 Membership probability for TGAS stars in 128 open clusters
See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/322 : UCAC4 Catalogue (Zacharias+, 2012) I/337 : Gaia DR1 (Gaia Collaboration, 2016) Byte-by-byte Description of file: members.dat
Bytes Format Units Label Explanations
1- 19 F19.15 deg RAdeg GaiaDR1 Right ascension (J2015.0) (ra) 21- 41 E21.15 deg DEdeg GaiaDR1 Declination (J2015.0) (dec) 43- 63 F21.18 mas e_RAdeg Uncertainty on Gaia Right ascension (ra_error) 65- 84 F20.17 mas e_DEdeg Uncertainty on Gaia Declination (dec_error) 86- 91 I6 --- HIP ? Hipparcos ID (hip) 93-104 A12 --- TYC2 Tycho-2 ID (tycho2_id) 106-124 I19 --- Source GaiaDR1 Source ID (source_id) 126-147 E22.18 mas plx GaiaDR1 parallax (parallax) 149-167 F19.17 mas e_plx GaiaDR1 parallax error (parallax_error) 169-190 E22.18 mas/yr pmRA GaiaDR1 proper motion in RA (pmra) 192-212 F21.18 mas/yr e_pmRA GaiaDR1 pmra error (pmra_error) 214-235 E22.18 mas/yr pmDE GaiaDR1 proper motion in DE (pmdec) 237-257 F21.18 mas/yr e_pmDE GaiaDR1 pmdec error (pmdec_error) 259-262 I4 --- NobsG GaiaDR1 number of G observations (Gnobs) 264-282 F19.16 mag Gmag GaiaDR1 G-band magnitude (G) 284-292 I9 --- 2MASSID 2MASS ID (tmass_oid) 294-303 F10.6 deg RA2deg 2MASS Right ascension (J2000) (ra_twomass) 305-314 E10.6 deg DE2deg 2MASS Declination (J2000) (dec_twomass) 316-324 A9 --- UCAC4 UCAC4 ID (ucac4_oid) 326-338 F13.9 deg RAUdeg UCAC4 Right ascension (J2000) (ra_ucac) 340-352 E13.9 deg DEUdeg UCAC4 Declination (J2000) (dec_ucac) 354-359 F6.1 mas/yr pmRAU ? UCAC4 pmra (pmra_ucac) 361-364 F4.1 mas/yr e_pmRAU ? UCAC4 pmra_error (pmraerrorucac) 366-371 F6.1 mas/yr pmDEU ? UCAC4 pmdec (pmdec_ucac) 373-376 F4.1 mas/yr e_pmDEU ? UCAC4 pmdec_error (pmdecerrorucac) 378-383 F6.3 mag Jmag ? 2MASS J magnitude (1.2um) (Jmag) 385-390 F6.3 mag Hmag ? 2MASS H magnitude (1.6um) (Hmag) 392-397 F6.3 mag Kmag ? 2MASS Ks magnitude (2.2um) (Kmag) 399-404 F6.3 mag Bmag ? B magnitude from APASS (Bmag) 406-411 F6.3 mag Vmag ? V magnitude from APASS (Vmag) 413-418 F6.3 mag gmag ? g magnitude from APASS (gmag) 420-425 F6.3 mag rmag ? r magnitude from APASS (rmag) 427-432 F6.3 mag imag ? i magnitude from APASS (imag) 434-446 E13.9 --- RADEcor Correlation between GaiaDR1 ra and dec (radeccorr) 448-461 E14.9 --- RAplxcor Correlation between GaiaDR1 ra and parallax (raparallaxcorr) 463-475 E13.9 --- RApmRAcor Correlation between GaiaDR1 ra and pmra (rapmracorr) 477-489 E13.9 --- RApmDEcor Correlation between GaiaDR1 ra and pmdec (rapmdeccorr) 491-503 E13.9 --- DEplxcor Correlation between GaiaDR1 dec and parallax (decparallaxcorr) 505-517 E13.9 --- DEpmRAcor Correlation between GaiaDR1 dec and pmra (decpmracorr) 519-532 E14.9 --- DEpmDEcor Correlation between GaiaDR1 dec and pmdec (decpmdeccorr) 534-547 E14.9 --- plxpmRAcor Correlation between GaiaDR1 parallax and pmra (parallaxpmracorr) 549-561 E13.9 --- plxpmDEcor Correlation between GaiaDR1 parallax and pmdec (parallaxpmdeccorr) 563-575 E13.9 --- pmRApmDEcor Correlation between GaiaDR1 pmra and pmdec (pmrapmdeccorr) 577-589 A13 --- Cluster Open cluster investigated (ocname) (1) 591 A1 --- PMused [TU] Proper motion catalogue used to determine membership (PMused) (2) 593-596 F4.2 --- Pfinal Probability that the star belongs to this open cluster (finalProba)
Note (1): a star might be listed multiple times with different ocnames and membership probabilities if it is present in the investigated fields of neighbouring clusters. Note (2): T stands for TGAS and U stands for UCAC4
Acknowledgements: Tristan Cantat-Gaudin, tcantat(at)
(End) T. Cantat-Gaudin [INAF-OAPd, Italy], Patricia Vannier [CDS] 06-Feb-2018
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

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