J/A+A/630/A119ivo://CDS.VizieR/J/A+A/630/A119doi:10.26093/cds/vizier.36300119CDSMaiz Apellaniz J.2021-01-08T16:45:36Z2019-10-02T06:43:16ZCDS support team

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

cds-question@unistra.fropen-star-clustersvisible-astronomytrigonometric-parallaxnarrow-band-photometrystellar-spectral-typesob-starsOn the one hand, the second data release of the Gaia mission (GaiaDR2, Cat. I/345) has opened a trove of astrometric and photometric data for Galactic clusters within a few kpc of the Sun. On the other hand, lucky imaging has been an operational technique to measure the relative positions of visual binary systems for a decade and a half, a time sufficient to apply its results to the calculation of orbits of some massive multiple systems within ~1kpc of the Sun. As part of an ambitious research program to measure distances to Galactic stellar groups (including clusters) containing O stars,I start with two of the nearest examples: Collinder 419 in Cygnus and NGC 2264 in Monoceros. The main ionizing source for both clusters is a multiple system with an O-type primary: HD 193322 and 15 Mon, respectively. For each of those two multiple systemsI aim to derive new astrometric orbits for the Aa,Ab components. First, I present a method that usesGaiaDR2 G+G_BP_+G_RP_ photometry, positions, proper motions, and parallaxes to obtain the membership and distance of a stellar group and apply it to Collinder 419 and NGC 2264. Second, I present a new code that calculates astrometric orbits by searching the whole seven-parameter orbit space and apply it to HD 193 322 Aa,Ab and 15 Mon Aa,Abusing as input literature data from the Washington Double Star Catalog (WDS) and the AstraLux measurements recently presented by Maiz Apellaniz et al. (2019, Cat. J/A+A/626/A20) I obtain GaiaDR2 distances of 1006^+37^_-34_pc for Collinder 419 and 719+/-16pc for NGC 2264, with the main contribution to the uncertainties coming from the spatial covariance of the parallaxes. The two NGC 2264 subclusters are at the same distance (within the uncertainties) and they show a significant relative proper motion. The distances are shown to be robust. HD 193322 Aa,Ab follows an eccentric (e=0.58^+0.03^_-0.04_) orbit with a period of 44+/-1 a and the three stars it contains have a total mass of 76.1^+9.9^_-7.4_M_{sun}_. The orbit of 15 Mon Aa,Ab is even more eccentric (e=0.770^+0.023^_-0.030_), with a period of 108+/-12 a and a total mass of 45.1^+3.6^_-3.3_M_{sun}_ for its two stars.2019A&A...630A.119Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/630/A119CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/626/A20 : MONOS. I. Spectral classifications (Maiz Apellaniz+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/630/A119https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/630/A119http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/630/A119https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/630/A119https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/630/A119http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/630/A119GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/630/A119/table9 (NGC 2264 members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/630/A119/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/630/A119/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/630/A119/table9?GETtext/xml+votable180.050000true100.28995839.46594440.005555555555555556Cone search capability for table J/A+A/630/A119/table8 (Collinder 419 members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/630/A119/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/630/A119/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/630/A119/table8?GETtext/xml+votable180.050000true304.528208340.73177780.0055555555555555566/14653 14696 23636-23637 236391.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/630/A119?format=asciiOpticaldefaultJ/A+A/630/A119/table9NGC 2264 membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name for cluster starsmeta.id;meta.maincharGaiaDR2Gaia DR2 IDmeta.id2MASS2MASS ID (JHHMMSSss+DDMMSSs)meta.idcharPlxGaia DR2 parallaxmaspos.parallaxfloate_PlxGaia DR2 parallax uncertaintymasstat.error;pos.parallaxfloatpmRA*Gaia DR2 proper motion in RA, pmRA*cosDEmas/apos.pm;pos.eq.rafloate_pmRA*Gaia DR2 proper motion in RA uncertaintymas/astat.error;pos.pm;pos.eq.rafloatpmDEGaia DR2 proper motion in decmas/apos.pm;pos.eq.decfloate_pmDEGaia DR2 proper motion in dec uncertaintymas/astat.error;pos.pm;pos.eq.decfloatGmagGaia DR2 G magnitudemagphot.mag;em.optfloate_GmagGaia DR2 G magnitude uncertaintymagstat.error;phot.magfloatBPmagGaia DR2 BP-RP colormagphot.mag;em.opt.Bfloate_BPmagGaia DR2 BP-RP color uncertaintymagstat.error;phot.magfloatSpTypeSpectral typesrc.spTypecharr_SpType[GS-] Spectral type source: G(OSSS) or S(imbad)meta.ref;pos.framecharsubcm[NS-] Subcluster membership: N(orth) or S(outh, for table9.dat onlymeta.code.membercharSimbadSimbad column added by the CDSmeta.ref.urlchar_RApositions from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEpositions from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/A+A/630/A119/table8Collinder 419 memberspmDEGaia DR2 proper motion in decmas/apos.pm;pos.eq.decfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name for cluster starsmeta.id;meta.maincharGaiaDR2Gaia DR2 IDmeta.id2MASS2MASS ID (JHHMMSSss+DDMMSSs)meta.idcharPlxGaia DR2 parallaxmaspos.parallaxfloate_PlxGaia DR2 parallax uncertaintymasstat.error;pos.parallaxfloatpmRA*Gaia DR2 proper motion in RA, pmRA*cosDEmas/apos.pm;pos.eq.rafloate_pmRA*Gaia DR2 proper motion in RA uncertaintymas/astat.error;pos.pm;pos.eq.rafloate_pmDEGaia DR2 proper motion in dec uncertaintymas/astat.error;pos.pm;pos.eq.decfloatGmagGaia DR2 G magnitudemagphot.mag;em.optfloate_GmagGaia DR2 G magnitude uncertaintymagstat.error;phot.magfloatBPmagGaia DR2 BP-RP colormagphot.mag;em.opt.Bfloate_BPmagGaia DR2 BP-RP color uncertaintymagstat.error;phot.magfloatSpTypeSpectral typesrc.spTypecharr_SpType[GS-] Spectral type source: G(OSSS) or S(imbad)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RApositions from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEpositions from 2MASS name (declination part)degpos.eq.dec;meta.main