Gaia DR2 candidate RR Lyrae of Sgr stream & dwarf J/A+A/638/A104 ivo://CDS.VizieR/J/A+A/638/A104 doi:10.26093/cds/vizier.36380104 CDS Ramos P. Mateu C. Antoja T. Helmi A. Castro-Ginard A. Balbinot E.,Carrasco J.M. 2022-01-14T08:12:04Z 2020-06-19T07:42:10Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr milky-way-galaxy variable-stars dwarf-stars proper-motions The Sagittarius (Sgr) stream is one of the best tools that we currently have to estimate the mass and shape of our Galaxy. However, assigning membership and obtaining the phase-space distribution of the stars that form the tails is quite challenging. Our goal is to produce a catalogue of RR Lyrae stars of Sgr and obtain an empiric measurement of the trends along the stream in sky position, distance and tangential velocities. We generate two initial samples from the Gaia DR2 RR Lyrae catalogue: one, selecting only the stars within +/-20{deg} of the orbital plane of Sagittarius (Strip) and the other, the result of applying the Pole Count Map (nGC3) algorithm. We then use the model-independent, deterministic method developed in this work to remove most of the contamination by detecting and isolating the stream in distance and proper motions. The output is two empiric catalogues: the Strip sample (higher-completeness, lower-purity) which contains 11677 stars, and the nGC3 sample (higher-purity, lower-completeness) with 6608 stars. We characterise the changes along the stream in all the available dimensions, the 5 astrometric ones plus the metallicity, covering more than 2{pi}rad in the sky and obtain new estimates for the apocentres and the mean [Fe/H] of the RR Lyrae population. Also, we show the first map of the two components of the tangential velocity, thanks to the combination of distances and proper motions. Finally, we detect the bifurcation in the leading arm and report no significant difference between the two branches, either in metallicity, kinematics or distance. We provide the largest sample of RR Lyrae candidates of Sgr, which can be used as an input for a spectroscopic follow-up or as a reference for the new generation of models of the stream through the interpolators in distance and velocity that we have constructed. 2020A&A...638A.104R https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/638/A104 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/345 : Gaia DR2 (Gaia Collaboration, 2018) II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016) J/A+A/622/A60 : Gaia DR2 misclassified RR Lyrae list (Clementini+, 2019) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/638/A104 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/638/A104 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/638/A104 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/638/A104 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/638/A104 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/638/A104 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/638/A104/tablee1 (Candidate RR Lyrae stars of the Sagittarius stream and dwarf from Gaia DR2) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/638/A104/tablee1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/638/A104/tablee1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/638/A104/tablee1? 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46762 46765 46773 46776-46778 46781 46785 46788 46802 46806-46807 46810-46811 46814 46816 46819 46823 46831 46834-46835 46837-46840 46842-46844 46847 46859-46861 46871 46873 46876 46881-46882 46891 46897-46899 46907-46908 46914 46918 46920 46923 46927 46932 46935 46937 46939-46940 46946 46950 46954 46957 46961-46962 46964-46966 46970 46972 46974 46980 46985 46991-46992 46994 46998 47005 47007 47015-47016 47020 47023 47026-47028 47031 47037 47045-47049 47051-47052 47057 47062 47066 47069 47071 47073-47076 47078 47083 47086 47088-47089 47092 47094-47095 47098 47317 47344 47433 47438 47446 47455 47470-47471 47475-47477 47482-47483 47485-47487 47495 47509 47519 47543 47545-47549 47551 47555-47557 47559 47566 47568-47569 47571 47576 47578-47579 47584-47586 47642 47655 47687 47695 47726 47740 47742-47743 47752-47753 47755 47757 47766 47769 47773 47776 47782-47784 47786 47788-47790 47795 47797 47801 47804-47805 47810 47817 47829-47831 47835 47840 47843 47849 47851-47853 47877 47879 47886-47887 47889-47891 47897-47899 47904-47905 47907 47988 47990 47992 47994-47995 47998 48068-48069 48071 48077-48078 48080 48082-48083 48085 48088 48096-48098 48100-48102 48104 48110 48115 48120 48122 48140 48147 48151-48153 48155 48159 48168 48170 48177-48179 48183-48186 48189 48192-48193 48195-48196 48201 48210-48211 48213-48216 48219-48222 48224 48229-48232 48234-48236 48239-48242 48249-48250 48252 48254 48262-48263 48268-48270 48272-48273 48276 48279-48280 48282-48284 48288 48290 48292 48294-48295 48297-48300 48302 48305-48308 48313-48314 48316-48317 48322-48323 48332 48336-48338 48340-48341 48343-48344 48346-48347 48349 48355 48360 48365 48369-48370 48373 48384 48390 48394-48396 48398 48404-48405 48407 48409-48411 48414 48424 48426-48428 48430-48431 48434 48439 48443 48450 48453-48454 48457 48482 48487 48496 48504 48506 48513 48515 48523-48525 48528 48533 48544-48545 48549 48567 48569 48576 48582-48583 48604 48614 48621 48644-48646 48653 48656 48658-48659 48662 48664 48666 48672 48676-48678 48683 48686-48687 48693 48710 48755 48757 48764 48781 48802 48804 48809 48824 48827 48835 48840 48854 48864 48869 48882 48891 48893-48894 48896 48908 48911 48923-48924 48934 48939 48941 48952 49042 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/638/A104?format=ascii default J/A+A/638/A104/tablee1 Candidate RR Lyrae stars of the Sagittarius stream and dwarf from Gaia DR2 SimbadName Simbad column added by the CDS meta.id char nullable d Distance kpc pos.distance;pos.heliocentric float recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR2 Gaia DR2 Unique source identifier meta.id;meta.main Gmag G-band mean magnitude (phot_g_mean_mag) mag phot.mag;em.opt.V float e_d Error on distance kpc stat.error float RA_ICRS Right ascension (ICRS) at Ep=2015.5 deg pos.eq.ra;meta.main indexed DE_ICRS Declination (ICRS) at Ep=2015.5 deg pos.eq.dec;meta.main indexed pmRA Proper motion in right ascension direction, pmRA*cosDE (J2015.5) mas/yr pos.pm;pos.eq.ra double e_pmRA Error in the Proper motion in right ascension direction (J2015.5) mas/yr stat.error;pos.pm;pos.eq.ra float pmDE Proper motion in declination direction (J2015.5) mas/yr pos.pm;pos.eq.dec double e_pmDE Error in the Proper motion in declination direction (J2015.5) mas/yr stat.error;pos.pm;pos.eq.dec float GLON Galactic longitude deg pos.galactic.lon GLAT Galactic latitude deg pos.galactic.lat double pmGLON Proper motion in Gal. longitude mas/yr pos.pm;pos.earth.lon float e_pmGLON Error in proper motion in Gal. longitude mas/yr stat.error float pmGLAT Proper motion in Gal. latitude mas/yr pos.pm;pos.earth.lat float e_pmGLAT Error in proper motion in Gal. latitude mas/yr stat.error float GLONS Sagittarius longitude (Belokurov, 2014MNRAS.437..116B) deg pos.galactic.lon GLATS Sagittarius latitude (Belokurov, 2014MNRAS.437..116B) deg pos.galactic.lat double pmGLONS Proper motion in Sagittarius longitude mas/yr pos.pm float e_pmGLONS Error in proper motion in Sgr longitude mas/yr stat.error float pmGLATS Proper motion in Sagittarius latitude mas/yr pos.pm float e_pmGLATS Error in proper motion in Sgr latitude mas/yr stat.error float vL Velocity along Sgr. longitude km/s phys.veloc double e_vL Error in velocity along Sgr longitude km/s stat.error float vB Velocity along Sgr. latitude km/s phys.veloc float e_vB Error in velocity along Sgr latitude km/s stat.error float SOStype Type of RR Lyr according to SOS classification src.class char PS1type Type of RR Lyr according to PS1 classification src.class char VCtype Type of RR Lyr according to the Variable Catalogue src.class char inputCat [1/111] 3-bit that indicates the source catalogue where the star is found (1) meta.code int Sample [1/11] 2-bit that indicates in which sample (nGC3 or Strip) the star has been found (2) meta.code int _RA.icrs Right ascension (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.ra nullable indexed _DE.icrs Declination (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.dec nullable indexed