J/AJ/117/2941ivo://CDS.VizieR/J/AJ/117/2941doi:10.26093/cds/vizier.51172941CDSStassun K.G.Mathieu R.D.Mazeh T.Vrba F.J.2023-04-06T16:50:33Z2002-11-29T21:40:47ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsradial-velocityline-intensitiesWe report rotation periods for 254 stars in an area 40'x80' centered on the Orion Nebula. We show that these stars are likely members of the young (~10^6^yr) Orion OBIc/d association. The rotation period distribution we determine, which is sensitive to periods 0.1<P<8days, shows a sharp cutoff for periods P<0.5days, corresponding to breakup velocity for these stars. Above 0.5days the distribution is consistent with a uniform distribution; we do not find evidence for a "gap" of periods at 4-5days. We find signatures of active accretion among stars at all periods; active accretion does not occur preferentially among slow rotators in our sample. We find no correlation between rotation period and near-IR signatures of circumstellar disks. In addition, we show that the distribution of vsini among stars in our sample bears striking resemblance to that of low-mass Pleiades stars. We discuss the implications of our findings for the evolution of stellar angular momentum during the pre-main-sequence phase. We argue that all stars in our sample must still deplete angular momentum by factors of roughly 5-10, if they are to preserve their vsini distribution over approximately the next 100Myr. We consider in detail whether our findings are consistent with disk-regulated stellar rotation. We do not find observational evidence that magnetic disk-locking is the dominant mechanism in angular momentum evolution during the premain-sequence phase.1999AJ....117.2941Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/117/2941CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/117/2941https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/117/2941http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/117/2941https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/117/2941https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/117/2941http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/117/2941GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/117/2941/table1 (Data for rotator sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/117/2941/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/117/2941/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/117/2941/table1?GETtext/xml+votable180.050000true83.4298333-6.08983330.005555555555555556Cone search capability for table J/AJ/117/2941/table2 (Data for rotators with 1%<FAP<5% (FAP = false alarm probability))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/117/2941/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/117/2941/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/117/2941/table2?GETtext/xml+votable180.050000true83.610125-5.01683330.0055555555555555566/21438-21439 22804-22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/117/2941?format=asciiOpticaldefaultJ/AJ/117/2941/table1Data for rotator samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SMM99]Star numbermeta.id;meta.mainintJW? JW number (1)meta.idintnullablen_JW[k] Hillenbrand (1997, Cat. <J/AJ/113/1733>) identifies this star as JW466meta.notecharRAJ2000Right ascension (J2000.0) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainImagI magnitudemagphot.mag;em.opt.IfloatPerRotation perioddtime.periodfloatn_Per[j] j: Detected at limit of period searchmeta.notechare_Per? rms uncertainty on Per (3)dstat.errorfloatnullablePerCH? Rotation period from Choi & Herbst, 1996AJ....111..283Cdtime.periodfloatnullableEWHa? H{alpha} equivalent width (4)0.1nmspect.line.eqWidthfloatnullablen_EWHa[i] i: Strong H{alpha} emittermeta.notecharEWLi? Li equivalent width (5)0.1nmspect.line.eqWidthfloatnullableFWHMLi? Li FWHM (5)0.1nmspect.line.widthfloatnullableRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullableMemb? Membership probability (1)%stat.fit.goodnessintnullableMass? Mass (Hillenbrand, 1997, Cat. <J/AJ/113/1733>)solMassphys.massfloatnullableRad? Radius (Hillenbrand, Cat. <J/AJ/113/1733>)solRadphys.size.radiusfloatnullablev/vbr? Velocity to break-up velocity ratiophys.veloc;arith.difffloatnullableD(I-K)? Near-IR excess emission (Hillenbrand et al. 1998ApJ...492..540H)phot.color.excessfloatnullableJ/AJ/117/2941/table2Data for rotators with 1%<FAP<5% (FAP = false alarm probability)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SMM99]Star numbermeta.id;meta.mainintJW? JW number (1)meta.idintnullablen_JW[k] Hillenbrand (1997, Cat. <J/AJ/113/1733>) identifies this star as JW466meta.notecharRAJ2000Right ascension (J2000.0) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainImagI magnitudemagphot.mag;em.opt.IfloatPerRotation perioddtime.periodfloatn_Per[j] j: Detected at limit of period searchmeta.notechare_Per? rms uncertainty on Per (3)dstat.errorfloatnullablePerCH? Rotation period from Choi & Herbst, 1996AJ....111..283Cdtime.periodfloatnullableEWHa? H{alpha} equivalent width (4)0.1nmspect.line.eqWidthfloatnullablen_EWHa[i] i: Strong H{alpha} emittermeta.notecharEWLi? Li equivalent width (5)0.1nmspect.line.eqWidthfloatnullableFWHMLi? Li FWHM (5)0.1nmspect.line.widthfloatnullableRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullableMemb? Membership probability (1)%stat.fit.goodnessintnullableMass? Mass (Hillenbrand, 1997, Cat. <J/AJ/113/1733>)solMassphys.massfloatnullableRad? Radius (Hillenbrand, Cat. <J/AJ/113/1733>)solRadphys.size.radiusfloatnullablev/vbr? Velocity to break-up velocity ratiophys.veloc;arith.difffloatnullableD(I-K)? Near-IR excess emission (Hillenbrand et al. 1998ApJ...492..540H)phot.color.excessfloatnullable