J/A+A/627/A4ivo://CDS.VizieR/J/A+A/627/A4doi:10.26093/cds/vizier.36270004CDSRoeser S.Schilbach E.2021-02-05T08:45:49Z2019-07-01T10:14:10ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fropen-star-clustersstellar-populationsWithin a 400pc sphere around the Sun, we search for Praesepe's tidal tails in the Gaia Data Release 2 (DR2) data set. We used a modified convergent-point method to find stars with space velocities close to the space velocity of the Praesepe cluster. We find a clear indication for the existence of Praesepe's tidal tails, both extending up to 165pc from the centre of the cluster. A total of 1393 stars populate the cluster and its tails, giving a total mass of 794M_{sun}_. We determined a tidal radius of 10.77pc for the cluster and a tidal mass of 483M_{sun}_. The corresponding half-mass radius is 4.8pc. We also found a clear indication for mass segregation in the cluster. The tidal tails outside 2 tidal radii are populated by 389 stars. The total contamination of our sample by field stars lies between 50 and 100 stars or 3.6-7.2%. We used an astrometrically and photometrically clean subsample of Gaia DR2, which makes our Praesepe sample incomplete beyond M~12.0mag; this corresponds to about 0.25M_{sun}_. A comparison with an N-body model of the cluster and its tails shows remarkably good coincidence. Three new white dwarfs are found in the tails.2019A&A...627A...4Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/627/A4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/627/A4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/627/A4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/627/A4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/627/A4https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/627/A4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/627/A4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/627/A4/stars (All the stars shown in Figures 2 and 3)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/627/A4/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/627/A4/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/627/A4/stars?GETtext/xml+votable180.050000true86.3070743177.055439020.0055555555555555564/293-294 5/1069 1083 1158 1168-1169 1171 1180-1181 1218 1224 6/3583 4096 4129 4136 4195 4225-4226 4228 4232 4236 4238-4239 4255 4259-4261 4265 4267-4268 4272 4274-4275 4281-4283 4285-4287 4298-4299 4304 4314 4321 4326 4328 4330-4331 4336-4338 4340 4343-4344 4346-4347 4349-4351 4458 4489 4491 4495 4518 4520 4522 4526 4529 4536 4558 4569 4577 4587 4591 4597 4602 4611-4613 4615 4617 4623 4625-4627 4629-4631 4636-4637 4639 4645 4655 4657-4662 4664 4667-4670 4680-4681 4683 4728-4730 4732-4734 4757 4801-4806 4813-4814 4816-4817 4819-4820 4822-4823 4829 4831 4837 4839 4852 4864 4866-4867 4869 4876-4877 4879 4882-4884 4887 4893-4894 4900 4902 4904 4906-4907 4910 4916 4919-4920 4923 4926 4931-4932 4939 4942 4982 4996 5000-5001 5007-5010 5012-5013 5019 5023 5026 5028 5033 5042 5045 5047 5058 5064 5067 5076-5077 5080 5085 5088 5090 5096 5099 5101 5105 5109 5117 5288 5352 5643 5655 5665-5666 5674 5677 5679 5697 5764-5765 5770 5773 5782 5784 5786 5789 5791 5796 5804 5812 5816-5817 5864 5866 5870 5878 6407 6417 6421 6457 6462 6469 6485 6491 6493 6496 6505 6517-6518 6526 6609 7168 7178 7184 7189-7190 7193 7199 7203 7209 7246 7251-7252 7271 7275 7279 7285 7316 7323 7344 7348-7349 7351 7363 7367-7369 7372 7375 7378 7381-7382 7386 7389-7391 7399 7404 7408 7413-7414 7417-7418 7422 7466 7552 7578 7585 7599 7752 7756 7768 7771 7798 7943 7969 7974 7980 7987 21764 21839 21847 21852 21871 21875-21876 21878-21880 21886-21887 21957 21972-21974 21979-21980 22001 22005-22006 40854-40855 40857-40858 40876-40878https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/627/A4?format=asciidefaultJ/A+A/627/A4/starsAll the stars shown in Figures 2 and 3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source id (source_id)meta.id;meta.mainRAICRSGaia DR2 right ascension (ICRS at Ep=2015.5) rounded to 10^-8^ degreesdegpos.eq.ra;meta.mainDEICRSGaia DR2 declination (ICRS at Ep=2015.5) rounded to 10^-8^ degreesdegpos.eq.dec;meta.mainGmagG-band mean magnitude (Vega) (phot_g_mean_mag)magphot.mag;em.opt.VdoubledvparVelocity parallel to the convergent point (1)km/sphys.velocfloatvperoVelocity perpendicular to the convergent point (2)km/sphys.velocfloatpcontProbability of being contaminated (3)stat.fit.goodnessdoubleSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed