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dc.contributor.authorvan Leeuwen, Flooren
dc.contributor.authorVallenari, Aen
dc.contributor.authorJordi, Cen
dc.contributor.authorLindegren, Len
dc.contributor.authorBastian, Uen
dc.contributor.authorPrusti, Ten
dc.contributor.authorDe Bruijne, JHJen
dc.contributor.authorBrown, AGAen
dc.contributor.authorBabusiaux, Cen
dc.contributor.authorBailer-Jones, CALen
dc.contributor.authorBiermann, Men
dc.contributor.authorEvans, Dafydden
dc.contributor.authorEyer, Len
dc.contributor.authorJansen, Fen
dc.contributor.authorKlioner, SAen
dc.contributor.authorLammers, Uen
dc.contributor.authorLuri, Xen
dc.contributor.authorMignard, Fen
dc.contributor.authorPanem, Cen
dc.contributor.authorPourbaix, Den
dc.contributor.authorRandich, Sen
dc.contributor.authorSartoretti, Pen
dc.contributor.authorSiddiqui, HIen
dc.contributor.authorSoubiran, Cen
dc.contributor.authorValette, Ven
dc.contributor.authorWalton, Nicholasen
dc.contributor.authorAerts, Cen
dc.contributor.authorArenou, Fen
dc.contributor.authorCropper, Men
dc.contributor.authorDrimmel, Ren
dc.contributor.authorHøg, Een
dc.contributor.authorKatz, Den
dc.contributor.authorLattanzi, MGen
dc.contributor.authorO'Mullane, Wen
dc.contributor.authorGrebel, EKen
dc.contributor.authorHolland, ADen
dc.contributor.authorHuc, Cen
dc.contributor.authorPassot, Xen
dc.contributor.authorPerryman, Men
dc.contributor.authorBramante, Len
dc.contributor.authorCacciari, Cen
dc.contributor.authorCastañeda, Jen
dc.contributor.authorChaoul, Len
dc.contributor.authorCheek, Nen
dc.contributor.authorDe Angeli, Francescaen
dc.contributor.authorFabricius, Cen
dc.contributor.authorGuerra, Ren
dc.contributor.authorHernández, Jen
dc.contributor.authorJean-Antoine-Piccolo, Aen
dc.contributor.authorMasana, Een
dc.contributor.authorMessineo, Ren
dc.contributor.authorMowlavi, Nen
dc.contributor.authorNienartowicz, Ken
dc.contributor.authorOrdóñez-Blanco, Den
dc.contributor.authorPanuzzo, Pen
dc.contributor.authorPortell, Jen
dc.contributor.authorRichards, PJen
dc.contributor.authorRiello, Marcoen
dc.contributor.authorSeabroke, GMen
dc.contributor.authorTanga, Pen
dc.contributor.authorThévenin, Fen
dc.contributor.authorTorra, Jen
dc.contributor.authorEls, SGen
dc.contributor.authorGracia-Abril, Gen
dc.contributor.authorComoretto, Gen
dc.contributor.authorGarcia-Reinaldos, Men
dc.contributor.authorLock, Ten
dc.contributor.authorMercier, Een
dc.contributor.authorAltmann, Men
dc.contributor.authorAndrae, Ren
dc.contributor.authorAstraatmadja, TLen
dc.contributor.authorBellas-Velidis, Ien
dc.contributor.authorBenson, Ken
dc.contributor.authorBerthier, Jen
dc.contributor.authorBlomme, Ren
dc.contributor.authorBusso, Giorgiaen
dc.contributor.authorCarry, Ben
dc.contributor.authorCellino, Aen
dc.contributor.authorClementini, Gen
dc.contributor.authorCowell, Sen
dc.contributor.authorCreevey, Oen
dc.contributor.authorCuypers, Jen
dc.contributor.authorDavidson, Men
dc.contributor.authorDe Ridder, Jen
dc.contributor.authorDe Torres, Aen
dc.contributor.authorDelchambre, Len
dc.contributor.authorDell'oro, Aen
dc.contributor.authorDucourant, Cen
dc.contributor.authorFrémat, Yen
dc.contributor.authorGarcía-Torres, Men
dc.contributor.authorGosset, Een
dc.contributor.authorHalbwachs, JLen
dc.contributor.authorHambly, NCen
dc.contributor.authorHarrison, Dianaen
dc.contributor.authorHauser, Men
dc.contributor.authorHestroffer, Den
dc.contributor.authorHodgkin, Simonen
dc.contributor.authorHuckle, HEen
dc.contributor.authorHutton, Aen
dc.contributor.authorJasniewicz, Gen
dc.date.accessioned2018-09-05T12:50:20Z
dc.date.available2018-09-05T12:50:20Z
dc.date.issued2017-05-01en
dc.identifier.issn0004-6361
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/279618
dc.description.abstract© 2017 ESO. Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are calculated using Hipparcos and Tycho-2 positions in 1991.25 as prior information. Aims. We investigate the scientific potential and limitations of the TGAS component by means of the astrometric data for open clusters. Methods. Mean cluster parallax and proper motion values are derived taking into account the error correlations within the astrometric solutions for individual stars, an estimate of the internal velocity dispersion in the cluster, and, where relevant, the effects of the depth of the cluster along the line of sight. Internal consistency of the TGAS data is assessed. Results. Values given for standard uncertainties are still inaccurate and may lead to unrealistic unit-weight standard deviations of least squares solutions for cluster parameters. Reconstructed mean cluster parallax and proper motion values are generally in very good agreement with earlier Hipparcos-based determination, although the Gaia mean parallax for the Pleiades is a significant exception. We have no current explanation for that discrepancy. Most clusters are observed to extend to nearly 15 pc from the cluster centre, and it will be up to future Gaia releases to establish whether those potential cluster-member stars are still dynamically bound to the clusters. Conclusions. The Gaia DR1 provides the means to examine open clusters far beyond their more easily visible cores, and can provide membership assessments based on proper motions and parallaxes. A combined HR diagram shows the same features as observed before using the Hipparcos data, with clearly increased luminosities for older A and F dwarfs.
dc.titleGaia Data Release 1: Open cluster astrometry: Performance, limitations, and future prospectsen
dc.typeArticle
prism.publicationDate2017en
prism.publicationNameAstronomy and Astrophysicsen
prism.volume601en
dc.identifier.doi10.17863/CAM.26989
dcterms.dateAccepted2017-02-25en
rioxxterms.versionofrecord10.1051/0004-6361/201730552en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-05-01en
dc.contributor.orcidvan Leeuwen, Floor [0000-0003-1781-4441]
dc.contributor.orcidEvans, Dafydd [0000-0002-6685-5998]
dc.contributor.orcidWalton, Nicholas [0000-0003-3983-8778]
dc.contributor.orcidRiello, Marco [0000-0002-3134-0935]
dc.contributor.orcidHarrison, Diana [0000-0001-8687-6588]
dc.contributor.orcidHodgkin, Simon [0000-0002-5470-3962]
dc.identifier.eissn1432-0746
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/K000756/1)
pubs.funder-project-idSTFC (ST/N000641/1)
pubs.funder-project-idEuropean Commission (264895)
pubs.funder-project-idEuropean Research Council (320360)
pubs.funder-project-idEC FP7 CP (606740)
cam.issuedOnline2017-04-21en
rioxxterms.freetoread.startdate2018-05-01


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