J/A+A/584/A26ivo://CDS.VizieR/J/A+A/584/A26doi:10.26093/cds/vizier.35840026CDSBouy H.Alves J.2025-11-27T20:00:34Z2016-03-09T11:36:31ZCDS support team

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

cds-question@unistra.frstellar-associationsvisible-astronomytrigonometric-parallaxWe construct a 3D map of the spatial density of OB stars within 500pc from the Sun using the Hipparcos catalogue and find three large-scale stream-like structures that allow a new view on the solar neighbourhood. The spatial coherence of these blue streams and the monotonic age sequence over hundreds of parsecs suggest that they are made of young stars, similar to the young streams that are conspicuous in nearby spiral galaxies. The three streams are 1) the Scorpius to Canis Majoris stream, covering 350pc and 65Myr of star formation history; 2) the Vela stream, encompassing at least 150pc and 25Myr of star formation history; and 3) the Orion stream, including not only the well-known Orion OB1abcd associations, but also a large previously unreported foreground stellar group lying only 200pc from the Sun. The map also reveals a remarkable and previously unknown nearby OB association, between the Orion stream and the Taurus molecular clouds, which might be responsible for the observed structure and star formation activity in this cloud complex. This new association also appears to be the birthplace of Betelgeuse, as indicated by the proximity and velocity of the red giant. If this is confirmed, it would solve the long-standing puzzle of the origin of Betelgeuse. The well-known nearby star-forming low-mass clouds, including the nearby T and R associations Lupus, Cha, Oph, CrA, Taurus, Vela R1, and various low-mass cometary clouds in Vela and Orion, appear in this new view of the local neighbourhood to be secondary star formation episodes that most likely were triggered by the feedback from the massive stars in the streams. We also recover well-known star clusters of various ages that are currently cruising through the solar neighbourhood. Finally, we find no evidence of an elliptical structure such as the Gould belt, a structure we suggest is a 2D projection effect, and not a physical ring.2015A&A...584A..26Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/584/A26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/584/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/584/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/584/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/584/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/584/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/584/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/584/A26/table3 (Members of the candidate new stellar groups)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/584/A26/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/584/A26/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/584/A26/table3?GETtext/xml+votable180.050000true84.0259753-7.39648870.0055555555555555565/5721 6/1040-1041 1114 21310 21357 21365 21367 21389 21401 21406 21433 21462 21468 21472 22051 22057-22059 22148 22615 22645 22803 22813 22817 22823-22824 22826 22829 22833 22839 22845 22854 22858-22859 22861-22863 22880 22882-22883 22888-22890 22893 22896 22904 22906-22907 22938 22943 22967 22986-22987 23316 23628 23701 23711 23756 23766 23769 23775 23779 23782 23944 24077 24085 24093-24095 24132 24138 24144 24149 24152 24159-24160 24179 24191 24273 24277-24278 24303 24311 24449 24451 24482 37688 37774-37775 37786 37800 37816-37817 39007 39168 39172 39177 39183 39187-39188 39193-39195 39198 39201-39202 39205 39216https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/584/A26?format=asciiOpticaldefaultJ/A+A/584/A26/table3Members of the candidate new stellar groupsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupNew stellar group name (1)meta.idcharHIPHIP numbermeta.id;meta.mainintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latSpTypeMK spectral typesrc.spTypecharplxHIP parallax (Cat. I/311)maspos.parallax.trigfloate_plxrms uncertainty on plxmasstat.error;pos.parallaxfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) (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.raindexed_DE.icrsDeclination (ICRS) (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.decindexed