J/AJ/163/266ivo://CDS.VizieR/J/AJ/163/266doi:10.26093/cds/vizier.51630266CDSLim B.Naze Y.Hong J.Yoon S.-Y.Lee J.Hwang N.Park B.-G.,Lee J.-E.2022-11-09T06:09:50Z2022-10-13T09:30:37ZCDS support team

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

cds-question@unistra.frstar-forming-regionsyoung-stellar-objectso-starsinfrared-astronomyspectroscopyinfrared-photometryvisible-astronomybroad-band-photometryradial-velocityStellar kinematics provides the key to understanding the star formation process. In this respect, we present a kinematic study of the Monoceros OB1 (Mon OB1) and R1 (Mon R1) associations using the recent Gaia data and radial velocities of stars derived from high-resolution spectroscopy and the literature. A total of 728 members are selected using the criteria based on the intrinsic properties of young stars, parallaxes, and proper motions. The spatial distribution and kinematic properties of members show that these associations have distinct substructures. In Mon OB1, we find one northern group and two southern groups. Mon R1 is composed of three small stellar groups that are spatially and kinematically distinct. Some stars are found in a halo around these two associations. We detect patterns of expansion for most stellar groups in the associations. In addition, two stellar groups in Mon OB1 show the signature of rotation, which provides an important constraint on cluster formation. The star formation history of Mon OB1 is slightly revised. Star formation first occurred in the southern region and subsequently in the northern region. Recent star-forming events ignited deeper into the southern region, while some stars are escaping from Mon OB1, forming a halo. Mon R1 might have formed at the same epoch as the formation of the northern group in Mon OB1. Given that star formation is taking place on different scales along a large arc-like structure, Mon OB1 and Mon R1 may be the results of hierarchical star formation.2022AJ....163..266Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/266CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/simbad : Simbad objects catalogue (M.Wenger 2000)B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2009)II/328 : AllWISE Data Release (Cutri+ 2013)I/337 : Gaia DR1 (Gaia Collaboration, 2016)VII/21 : Catalogue of Reflection Nebulae (Van den Bergh, 1966)V/125 : Photometry and Spectroscopy for Luminous Stars (Reed 2005)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997)J/AJ/123/1528 : UBV(RI)_C_ and JHK photometry in NGC 2264 (Rebull+, 2002)J/AJ/126/1916 : JHK photometry of young clusters near Sun (Porras+, 2003)J/AJ/128/1684 : NGC 2264; VRIH{alpha} photometry (Sung+, 2004)J/A+A/455/903 : ACIS-I observations of NGC 2264 (Flaccomio+, 2006)J/ApJ/648/1090 : Radial velocities of NGC 2264 stars (Furesz+, 2006)J/ApJS/175/277 : Submm-Continuum SCUBA detections (Di Francesco+, 2008)J/ApJ/688/1142 : Star formation in W5; Spitzer observations (Koenig+, 2008)J/AJ/135/441 : VRIH{alpha} photometry in NGC 2264 (Sung+, 2008)J/AJ/138/963 : Rotation of NGC 2264 members (Baxter+, 2009)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/138/1116 : A Spitzer view of NGC 2264 (Sung+, 2009)J/A+A/539/A74 : NGC1893 Chandra X-ray catalog (Caramazza+, 2012)J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)J/ApJ/787/107 : Spatial structure of young stellar clusters I. (Kuhn+, 2014)J/AJ/149/127 : The SOS project. IV. NGC 1624 and NGC 1931 (Lim+, 2015)J/AJ/149/119 : Radial velocities of stars in NGC 2264 (Tobin+, 2015)J/ApJ/831/116 : Photometry & spectroscopy PMS stars in NGC 2264 (Lim+, 2016)J/A+A/594/A82 : XMM sources in IC 1805 (Rauw+, 2016)J/MNRAS/477/1993 : NGC 1893 stars LSR velocities (Lim+, 2018)J/A+A/609/A10 : NGC2264 structure and star formation history (Venuti+, 2018)J/A+A/626/A17 : Young pop. in Vela-Puppis region (Cantat-Gaudin+, 2019)J/ApJ/870/32 : Kinematics young star clusters & associations (Kuhn+, 2019)J/A+A/631/A3 : G202.3+2.5 position-velocity cubes (Montillaud+, 2019)J/ApJ/899/121 : 127 early type & pre-main-sequence stars in W4 (Lim+, 2020)J/AJ/159/272 : Orion Nebula PMs with HST Treasury Program (Platais+, 2020)J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021)J/AJ/162/56 : Radial velocity 240 YSOs with MMT/Hectochelle (Lim+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/266https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/266http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/266https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/266https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/266http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/266GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/163/266/table1 (List of members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/163/266/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/163/266/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/163/266/table1?GETtext/xml+votable180.050000true97.17679179.53591670.0055555555555555565/5909 6/23635 23641 23644-23646 238101.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/163/266?format=asciiOpticalInfrareddefaultJ/AJ/163/266/table1List of membersDEJ2000[8/10] Degree of Declination (J2000)pos.eq.dec;meta.mainplx[1.01/1.96] Gaia EDR3 parallax (1)maspos.parallax.trigfloate_plx[0.01/0.5] Uncertainty in plxmasstat.error;pos.parallaxfloatpmRAcosDE[-4.55/0.1] Gaia EDR3 proper motion along RA*cos(DE)mas/yrpos.pm;pos.eq.rafloate_pmRAcosDE[0.01/0.6] Uncertainty in pmRAcosDEmas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-8.28/-0.53] Gaia EDR3 proper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDE[0.01/0.5] Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatGmag[7.15/19.5] Gaia EDR3 G band apparent magnitudemagphot.mag;em.optfloatBPmag[7.03/21.6] Gaia EDR3 Blue passband apparent magnitudemagphot.mag;em.opt.BfloatRPmag[7.36/18] Gaia EDR3 Red passband apparent magnitudemagphot.mag;em.opt.RfloatB-R[-0.34/4.07] Gaia EDR3 Blue-Red colormagphot.color;em.opt.B;em.opt.RfloatRVel[-7.56/12.24]? Local Standard of Rest radial velocity (2)km/sphys.velocfloatnullablee_RVel[0.01/5]? Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatnullableTypeMember type (3)src.classcharRegionRegion identifier; Halo, Mon OB1 or Mon R1meta.id;obs.fieldcharGroupGroup identifiermeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNum[1/728] Sequence numbermeta.id;meta.mainintRAJ2000[6/6] Hour of Right Ascension (J2000)pos.eq.ra;meta.main