J/A+A/614/A12ivo://CDS.VizieR/J/A+A/614/A12doi:10.26093/cds/vizier.36140012CDSMontarges M.Norris R.Chiavassa A.Tessore B.Lebre A.Baron F.2018-07-17T11:29:40Z2018-06-06T10:42:02ZCDS support team

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

cds-question@unistra.frinterferometrysupergiant-starsm-starslate-type-starsRed supergiant stars represent one of the latest stages of the evolution of massive stars. Their photospheric convection may play an important role in the launching mechanism of their mass loss. Yet, its characteristics and dynamics are poorly constrained. By observing red supergiant stars with near infrared interferometry at different epochs, we expect to unveil the evolution of bright convective features on their stellar surface. We observed the M2Iab-Ib red supergiant star CE Tau with the VLTI/PIONIER instrument in the H band at two different epochs separated by one month. We derive the angular diameter of the star, basic stellar parameters and reconstruct two reliable images of its H band photosphere. The contrast of the convective pattern of the reconstructed images is 5+/-1% and 6+/-1 % for our two epochs of observation. The stellar photosphere shows few changes between the two epochs. The contrast of the convective pattern is below the average contrast variations obtained on 30 randomly chosen snapshots of the best matching 3D radiative hydrodynamics simulation: 23+/-1% for the original simulation images, and 16+/-1% for the maps degraded to the reconstruction resolution. We offer two hypotheses to explain this observation: CE Tau may be experiencing a quiet convective activity episode or it could be a consequence of its warmer effective temperature (hence its smaller radius) compared to the simulation.2018A&A...614A..12Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/614/A12CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/614/A12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/614/A12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/614/A12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/614/A12https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/614/A12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/614/A12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/614/A12/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/614/A12/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/614/A12/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/614/A12/list?GETtext/xml+votable180.050000true83.0531218.594230.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/614/A126/24164https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/614/A12?format=asciidefaultJ/A+A/614/A12/stel_parStellar parameters compiled from Sect. 4.1.2 of the articlerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the starmeta.id;meta.maincharMonthMonth of observationtime.epochcharYearYear of observationtime.epochintRadiusStellar radiussolRadphys.angSize;srcinte_RadiusError on the stellar radiussolRadstat.error;phys.size.radiusintFbolBolometric fluxW.m**-2phot.flux.boldoublee_FbolError on the bolometric fluxW.m**-2stat.errordoubleTeffEffective temperatureKphys.temperature.effectiveinte_TeffError on the effective temperatureKstat.error;phys.temperature.effectiveintlogLLuminositylog(solLum)phys.luminosityfloate_logLLower error on the luminositylog(solLum)stat.errorfloatE_logLUpper error on the luminositylog(solLum)stat.error;stat.maxfloatMcurCurrent masssolMassphys.massfloate_McurLower error on the current masssolMassstat.errorfloatE_McurUpper error on the current masssolMassstat.error;stat.maxfloatloggEffective gravitylog(cm.s**-2)phys.gravityfloate_loggLower error on the effective gravitylog(cm.s**-2)stat.errorfloatE_loggUpper error on the effective gravitylog(cm.s**-2)stat.error;stat.maxfloatAgeAge of the starMyrtime.agefloate_AgeLower error on the ageMyrstat.error;time.agefloatE_AgeUpper error on the ageMyrstat.error;stat.maxfloatJ/A+A/614/A12/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.bib.pagechar