J/A+A/675/A204ivo://CDS.VizieR/J/A+A/675/A204doi:10.26093/cds/vizier.36750204CDSVlasblom M.De Marchi G.2024-11-28T20:04:10Z2023-07-20T10:22:51ZCDS support team

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

cds-question@unistra.frmagellanic-cloudspre-main-sequence-starshst-photometryvisible-astronomyh-alpha-photometryWe studied the properties of the young stellar populations in the NGC 299 cluster in the Small Magellanic Cloud using observations obtained with the Hubble Space Telescope in the V, I, and H{alpha} bands. We identified 250 stars with H{alpha} excess exceeding 5 sigma and an equivalent width of the H{alpha} emission line of at least 20{AA}, which indicates that these stars are still undergoing active accretion and therefore represent bona fide pre-main-sequence (PMS) objects. For 240 of them, we derived physical stellar parameters such as the mass, age, and mass accretion rate by comparing the observed photometry with theoretical models. We find evidence that suggests the existence of two populations of PMS stars, one with a median age of around 25Myr and the other about 50Myr old. These ages are consistent with previously determined ages for the main population of the cluster. The average mass accretion rate for these PMS stars is roughly 5e-9 Msun/yr, which is comparable to the values found with the same method in other low-metallicity, low-density clusters in the Magellanic Clouds, but is about a factor of three lower than those measured for stars of similar mass and age in denser Magellanic Cloud stellar regions. Our findings support the hypothesis that both the metallicity and density of the forming environment can affect the mass accretion rate and thus the star formation process in a region.2023A&A...675A.204Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/675/A204CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/875/51 : Mass accretion rates of PMS stars. VI. LH95 in LMCJ/A+A/675/A203 : NGC 376 photometric catalogue (Tsilia+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/675/A204https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/675/A204http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/675/A204https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/675/A204https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/675/A204http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/675/A204GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/675/A204/table1 (Position, magnitudes, and uncertainties of the 7929 selected sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/675/A204/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/675/A204/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/675/A204/table1?GETtext/xml+votable180.050000true13.3500225-72.2315255560.005555555555555556Cone search capability for table J/A+A/675/A204/table3 (Physical parameters of the 240 bona fide PMS stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/675/A204/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/675/A204/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/675/A204/table3?GETtext/xml+votable180.050000true13.3507675-72.2308397220.0055555555555555566/333172.367228618189496e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/675/A204?format=asciiOpticaldefaultJ/A+A/675/A204/table1Position, magnitudes, and uncertainties of the 7929 selected sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number for this cataloguemeta.id;meta.mainintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainImagI band magnitudemagphot.mag;em.opt.Ifloate_ImagUncertainty on I band magnitudemagstat.error;phot.magfloatVmagV band magnitudemagphot.mag;em.opt.Vfloate_VmagUncertainty on V band magnitudemagstat.error;phot.magfloatHamagH{alpha} band magnitudemagphot.flux;em.line.Halphafloate_HamagUncertainty on H{alpha} band magnitudemagstat.error;phot.magfloatJ/A+A/675/A204/table3Physical parameters of the 240 bona fide PMS starsLbolBolometric luminositylog(solLum)phys.luminosityfloatRStellar radiussolRadphys.size.radiusfloatMassStellar masssolMassphys.massfloatAge? Stellar ageMyrtime.agefloatnullablee_Age? Uncertainty on stellar ageMyrstat.error;time.agefloatnullableLHalphaH{alpha} luminositysolLumphys.luminosity;em.line.HalphafloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number for this cataloguemeta.id;meta.mainintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainImagI band magnitudemagphot.mag;em.opt.IfloatVmagV band magnitudemagphot.mag;em.opt.VfloatHamagH{alpha} band magnitudemagphot.flux;em.line.HalphafloatTeffEffective temperatureKphys.temperature.effectiveintlogdMacc/dt? Mass accretion ratelog(solMass.yr**-1)arith.rate;phys.massfloatnullable