J/MNRAS/518/1505ivo://CDS.VizieR/J/MNRAS/518/1505doi:10.26093/cds/vizier.75181505CDSKamann S.Saracino S.Bastian N.Gossage S.Usher C.Baade D.,Cabrera-Ziri I.de Mink S.E.Ekstrom S.Georgy C.Hilker M.,Larsen S.S.Mackey D.Niederhofer F.Platais I.Yong D.2024-08-22T20:16:36Z2022-11-23T08:46:50ZCDS support team

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

cds-question@unistra.frglobular-star-clustersearly-type-starshst-photometryspectroscopyultraviolet-astronomyYoung star clusters enable us to study the effects of stellar rotation on an ensemble of stars of the same age and across a wide range in stellar mass and are therefore ideal targets for understanding the consequences of rotation on stellar evolution. We combine MUSE spectroscopy with HST photometry to measure the projected rotational velocities (Vsini) of 2184 stars along the split main sequence and on the main sequence turn-off (MSTO) of the 100Myr-old massive (10^5^M_{sun}_) star cluster NGC 1850 in the Large Magellanic Cloud. At fixed magnitude, we observe a clear correlation between Vsini and colour, in the sense that fast rotators appear redder. The average Vsini values for stars on the blue and red branches of the split main sequence are ~100km/s and ~200km/s, respectively. The values correspond to about 25-30% and 50-60% of the critical rotation velocity and imply that rotation rates comparable to those observed in field stars of similar masses can explain the split main sequence. Our spectroscopic sample contains a rich population of ~200 fast rotating Be stars. The presence of shell features suggests that 23% of them are observed through their decretion disks, corresponding to a disk opening angle of 15 degrees. These shell stars can significantly alter the shape of the MSTO, hence care should be taken when interpreting this photometric feature. Overall, our findings impact our understanding of the evolution of young massive clusters and provide new observational constraints for testing stellar evolutionary models.2023MNRAS.518.1505Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/518/1505CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/518/1505https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/518/1505http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/518/1505https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/518/1505https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/518/1505http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/518/1505GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/518/1505/ngc1850 (The HST photometry for NGC 1850)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/518/1505/ngc1850?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/518/1505/ngc1850?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/518/1505/ngc1850?GETtext/xml+votable180.050000true77.16427037867797-68.761973218717530.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/MNRAS/518/15056/331202.238682544986967e-19 7.886974166154988e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/518/1505?format=asciiUVdefaultJ/MNRAS/518/1505/ngc1850The HST photometry for NGC 1850spindicates spectrum in list.datmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdUnique identifier for each source (1)meta.id;meta.mainintprimaryRAJ2000Right Ascension (J2000.0)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainindexedF275w? HST/WFC3 UVIS F275W magnitude (Vega)magphot.mag;em.UV.200-300nmfloatnullablee_F275w? Uncertainty of F275W magnitudemagstat.errorfloatnullableF336w? HST/WFC3 UVIS F336W magnitude (Vega)magphot.mag;em.opt.Ufloatnullablee_F336w? Uncertainty of F336W magnitudemagstat.errorfloatnullableF343n? HST/WFC3 UVIS F343N magnitude (Vega)magphot.mag;em.opt.Ufloatnullablee_F343n? Uncertainty of F343N magnitudemagstat.errorfloatnullableF438w? HST/WFC3 UVIS F438W magnitude (Vega)magphot.mag;em.opt.Ufloatnullablee_F438w? Uncertainty of F438W magnitudemagstat.errorfloatnullableF656n? HST/WFC3 UVIS F656N magnitude (Vega)magphot.mag;em.opt.Ufloatnullablee_F656n? Uncertainty of F656N magnitudemagstat.errorfloatnullableF814w? HST/WFC3 UVIS F814W magnitude (Vega)magphot.mag;em.opt.Ifloatnullablee_F814w? Uncertainty of F814W magnitudemagstat.errorfloatnullableGaiaEDR3? Source ID in Gaia EDR3 (where available)meta.idnullableJ/MNRAS/518/1505/listList of fits spectrasizeSize of FITS fileKibytephys.size;meta.fitsintSpShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdUnique identifier for each sourcemeta.id;meta.mainintNxNumber of pixels along X-axismeta.numberintbAWAVLower value of wavelength interval0.1nmem.wlintBAWAVUpper value of wavelength interval0.1nmem.wlfloatdAWAV? Wavelength resolution0.1nmspect.resolutionfloatnullable