J/A+A/632/A95ivo://CDS.VizieR/J/A+A/632/A95doi:10.26093/cds/vizier.36320095CDSMozdzierski D.Pigulski A.Kolaczkowski Z.Michalska G.Kopacki G.,Carrier F.Walczak P.Narwid A.Steslicki M.Fu J.-N.Jiang X.-J.,Zhang C.Jackiewicz J.Telting J.Morel T.Saesen S.Zahajkiewicz E.,Brus P.Srodka P.Vuckovic M.Verhoelst T.Van Helshoecht V.,Lefever K.Gielen C.Decin L.Vanautgaerden J.Aerts C.2019-12-31T10:13:10Z2019-12-10T09:26:09ZCDS support team

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

cds-question@unistra.fropen-star-clustersvariable-starsccd-photometryvisible-astronomynarrow-band-photometryb-starsThe aim of this study is to obtain the age of the open cluster NGC 6910 by means of ensemble asteroseismology of the early-type pulsating members, to derive their stellar parameters, and to classify the excited modes. We used time-series analysis, performed photometric and spectroscopic mode identification, and calculated grids of evolutionary and seismic models to apply the procedure of ensemble asteroseismology for nine pulsating members of NGC 6910. With two iterations of the procedure of ensemble asteroseismology we derived an age of 10.6^+0.9^_-0.8_Myr for NGC 6910. We also identified the degree l for 8 of 37 modes detected in these stars and classified all modes in terms of p, g, and mixed-mode pulsations. Of the nine pulsating stars examined in the paper, eight are {beta} Cep stars, including three that are hybrid {beta} Cep and slowly pulsating B-type (SPB) pulsators, and one is an SPB star. Interestingly, the least massive {beta} Cep star, NGC 6910-38, has a mass of about 5.6 solar masses. The present theory does not predict unstable p modes in B-type stars with such a low mass. The g modes with relatively high frequencies (>3.5d^-1^), observed in three members of the cluster, are also stable according to seismic modelling. Both findings pose a challenge for theoretical calculations and prompt a revision of the opacities. The procedure of ensemble asteroseismology was found to be successful for NGC 6910 and {chi} Per on the basis of pulsating B-type stars and can therefore be applied to other young open clusters that are rich in such stars.2019A&A...632A..95Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/632/A95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/632/A95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/632/A95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/632/A95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/632/A95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/632/A95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/632/A95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/632/A95/stars (List of the program pulsating stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/632/A95/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/632/A95/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/632/A95/stars?GETtext/xml+votable180.050000true305.781583340.76913890.0055555555555555566/146903.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/632/A95?format=asciiOpticaldefaultJ/A+A/632/A95/starsList of the program pulsating starsWEBDAWEBDA number (1)meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagJohnson V magnitudemagphot.mag;em.opt.VfloatLCShow the light curvesmeta.ref.urlcharFileUGName of the file with Geneva U photometry in subdirectory lcphot;em.opt.U;meta.filecharFileBName of the file with Johnson B photometry in subdirectory lcphot;em.opt.B;meta.filecharFileVName of the file with Johnson V photometry in subdirectory lcphot;em.opt.V;meta.filecharFileIName of the file with Cousins I photometry in subdirectory lcphot;em.opt.I;meta.filecharSimbadSimbad column added by the CDSmeta.ref.urlchar