J/MNRAS/442/273ivo://CDS.VizieR/J/MNRAS/442/273doi:10.26093/cds/vizier.74420273CDSLata S.Yadav R.K.Pandey A.K.Richichi A.Eswaraiah C.Kumar B.,Kappelmann N.Sharma S.2024-08-09T20:15:29Z2016-02-10T14:49:35ZCDS support team

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

cds-question@unistra.fropen-star-clustersvariable-starsinfrared-photometryIn this paper, we present time series photometry of 104 variable stars in the cluster region NGC 1893. The association of the present variable candidates to the cluster NGC 1893 has been determined by using (U-B)/(B-V) and (J-H)/(H-K) two colour diagrams, and V/(V-I) colour-magnitude diagram. 45 stars are found to be main-sequence variables and these could be B-type variable stars associated with the cluster. We classified these objects as {beta} Cep, slowly pulsating B stars and new class variables as discussed by Mowlavi et al. (2013, Cat. J/A+A/554/A108). These variable candidates show ~0.005 to ~0.02mag brightness variations with periods of <1.0d. 17 new class variables are located in the H-R diagram between the slowly pulsating B stars and {delta} Scuti variables. Pulsation could be one of the causes for periodic brightness variations in these stars. The X-ray emission of present main-sequence variables associated with the cluster lies in the saturated region of X-ray luminosity versus period diagram and follows the general trend by Pizzolato et al. (2003, Cat. J/A+A/397/147).2014MNRAS.442..273Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/442/273CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/397/147 : Activity-rotation relationship in stars (Pizzolato+ 2003)J/A+A/488/211 : Infrated photometry of NGC 1893 (Caramazza+, 2008)J/A+A/527/A77 : NGC 1893 optical and NIR photometry (Prisinzano+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/442/273https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/442/273http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/442/273https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/442/273https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/442/273http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/442/273GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/442/273/table2 (The present photometric data, NIR data, period, amplitude and classification of 104 variables in the region of NGC 1893)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/442/273/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/442/273/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/442/273/table2?GETtext/xml+votable180.050000true80.615333.508470.0055555555555555566/1285 12878.824067378408481e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/442/273?format=asciiInfrareddefaultJ/MNRAS/442/273/table2The present photometric data, NIR data, period, amplitude and classification of 104 variables in the region of NGC 1893ClassClassificationsrc.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable name (VNNN)meta.id;meta.maincharn_VName[* ] Note on VName (1)meta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.IfloatJmag? 2MASS J magnitude (2)magphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitude (2)magphot.mag;em.IR.HfloatnullableKmag? 2MASS K magnitude (2)magphot.mag;em.IR.KfloatnullableJmko? MKO J magnitude (TNG/NICS Js) (2)magphot.mag;em.IR.JfloatnullableHmko? MKO H magnitude (TNG/NICS H) (2)magphot.mag;em.IR.HfloatnullableKmko? MKO K magnitude (TNG/NICS K') (2)magphot.mag;em.IR.KfloatnullablePerPerioddtime.periodfloatPer2? Second period valuedtime.periodfloatnullablePer3? Third period valuedtime.periodfloatnullablePer4? Fourth period valuedtime.periodfloatnullableAmpAmplitude of variationmagarith.rate;phot.magfloatP11Display the Prisinzano et al. (2011, Cat. J/A+A/527/A77) datameta.ref.urlchar