J/MNRAS/476/2813ivo://CDS.VizieR/J/MNRAS/476/2813doi:10.26093/cds/vizier.74762813CDSDutta S.Mondal S.Joshi S.Jose J.Das R.Ghosh S.2024-08-18T20:18:33Z2021-05-31T14:20:03ZCDS support team

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

cds-question@unistra.frh-ii-regionsvariable-starsinfrared-photometryvisible-astronomybroad-band-photometryWe report here CCD I-band time series photometry of a young (2-5Myr) cluster NGC 2282, in order to identify and understand the variability of pre-main-sequence (PMS) stars. The I-band photometry, down to ~20.5mag, enables us to probe the variability towards the lower mass end (~0.1M_{sun}_) of PMS stars. From the light curves of 1627 stars, we identified 62 new photometric variable candidates. Their association with the region was established from H{alpha} emission and infrared (IR) excess. Among 62 variables, 30 young variables exhibit H{alpha} emission, near-IR (NIR)/mid-IR (MIR) excess or both and are candidate members of the cluster. Out of 62 variables, 41 are periodic variables, with a rotation rate ranging from 0.2-7d. The period distribution exhibits a median period at ~1d, as in many young clusters (e.g. NGC 2264, ONC, etc.), but it follows a unimodal distribution, unlike others that have bimodality, with slow rotators peaking at ~6-8d. To investigate the rotation-disc and variability-disc connection, we derived the NIR excess from {Delta}(I-K) and the MIR excess from Spitzer [3.6]-[4.5]um data. No conclusive evidence of slow rotation with the presence of discs around stars and fast rotation for discless stars is obtained from our periodic variables. A clear increasing trend of the variability amplitude with IR excess is found for all variables.2018MNRAS.476.2813Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/476/2813CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/454/3597 : NGC 2282 BVI Ha observations (Dutta+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/476/2813https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/476/2813http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/476/2813https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/476/2813https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/476/2813http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/476/2813GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/476/2813/table2 (Catalogue of the identified variable stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/2813/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/2813/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/2813/table2?GETtext/xml+votable180.050000true101.735121111.277933890.0055555555555555566/222093.9193497546148093e-20 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/476/2813?format=asciiOpticalInfrareddefaultJ/MNRAS/476/2813/table2Catalogue of the identified variable starsRmag? R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? rms uncertainty on Rmagmagstat.error;phot.magfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number, [DMJ2015] NNNN in Simbadmeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declinaition (J2000)degpos.eq.dec;meta.mainBmag? B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? rms uncertainty on Bmagmagstat.error;phot.magfloatnullableVmag? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.magfloatnullableImag? I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? rms uncertainty on Imagmagstat.error;phot.magfloatnullableJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.magfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.magfloatnullableKmag? K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.magfloatnullable[3.6]? Spitzer/IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullableW1mag? Wise W1 (3.4um) magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? rms uncertainty on W1magmagstat.error;phot.magfloatnullableW2mag? Wise W2 (4.6um) magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? rms uncertainty on W2magmagstat.error;phot.magfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar