J/AJ/121/1040ivo://CDS.VizieR/J/AJ/121/1040doi:10.26093/cds/vizier.51211040CDSPreibisch T.Guenther E.Zinnecker H.2023-04-06T16:50:41Z2003-01-04T15:47:17ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsline-intensitiesWe present the results of a large intermediate-resolution spectroscopic survey for pre-main-sequence (PMS) stars in the Upper Scorpius OB association, the nearest region of recent massive star formation. Utilizing the 2dF multiobject spectrograph at the Anglo-Australian Telescope, we obtained spectra of 576 stars with magnitudes 12.5<=R<=16.5 in a 6{deg}^2^ area in Upper Scorpius. Among these objects we were able to identify 98 new PMS stars, nearly all of them M-type stars, by their strong lithium absorption lines. We place the new PMS stars into the H-R diagram and find that their ages agree well with the mean age of 5Myr determined in our earlier investigation based on a smaller sample of stars. The number of low-mass (0.1M_{sun}_<~M*<~0.5M_{sun}) members is at least as high as expected from the known number of high-mass (M*>~3M_{sun}_) association members and from recent determinations of the field star initial mass function. Thus, there is no deficit of low-mass stars in Upper Scorpius.2001AJ....121.1040Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/121/1040CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/333/619 : Upper Scorpius OB association Lithium survey (Preibisch+ 1998)J/AJ/124/404 : Upper Scorpius OB association Lithium survey. II.https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/121/1040https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/121/1040http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/121/1040https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/121/1040https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/121/1040http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/121/1040GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/121/1040/table1 (Li-rich stars in Upper Scorpius detected in our 2dF survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/1040/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/1040/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/1040/table1?GETtext/xml+votable180.050000true240.49875-19.8719440.0055555555555555566/44365-44367 44378-44379 44388-44389 44391 44400-44401https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/121/1040?format=asciiOpticaldefaultJ/AJ/121/1040/table1Li-rich stars in Upper Scorpius detected in our 2dF surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[PGZ2001]Star name (1)meta.id;meta.maincharf_[PGZ2001]Flag on [PGZ2001] (2)meta.codecharEWLiLi 6708{AA} equivalent width (in {AA})0.1nmfloatu_EWLiUncertainty flag on EWLicharEWHaH{alpha} equivalent width (in {AA})0.1nmfloatu_EWHaUncertainty flag on EWHacharSpTypeSpectral typecharu_SpTypeUncertainty flag on SpTypechar_RAPosition derived from its [PGZ2001] name (right ascension part)degpos.eq.ra;meta.main_DEPosition derived from its [PGZ2001] name (declination part)degpos.eq.dec;meta.main