J/A+A/658/A198ivo://CDS.VizieR/J/A+A/658/A198doi:10.26093/cds/vizier.36580198CDSRainot A.Reggiani M.Sana H.Bodensteiner J.Absil O.2022-10-12T08:50:04Z2022-02-25T08:06:33ZCDS support team

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

cds-question@unistra.fropen-star-clustersmultiple-starsearly-type-starso-starspre-main-sequence-starsstellar-agesstellar-massesphotometryvisible-astronomyMost massive stars belong to multiple systems, yet the formation process leading to such high multiplicity remain insufficiently understood. To help constrain the different formation scenarios that exist, insights on the low-mass end of the companion mass function of such stars is crucial. However, this is a challenging endeavour as (sub-)solar mass companions at angular separations {rho} below 1" (corresponding to 1000-3000au in nearby young open clusters and OB associations) are difficult to detect due to the large brightness contrast with the central star. With the Carina High-contrast Imaging Project of massive Stars (CHIPS), we aim to obtain statistically significant constraints on the presence and properties of low-mass companions around massive stars at a previously unreachable observing window ({Delta}mag>=10 at {rho}<= 1"). In this second paper in the series, we focus on the Trumpler 14 cluster, which harbours some of the youngest and most massive O-type stars in the Milky Way. We obtained VLT-SPHERE observations of seven O-type objects in Trumpler 14 using the IRDIFS_EXT mode. These allow us to search for companions at separations larger than 0.15" (~360au) and down to magnitude contrast >10 mag in the near-infrared. We used angular and spectral differential imaging along with PSF fitting to detect sources and measure their flux relative to that of the central object. We detected 211 sources with near-infrared magnitude contrast in the range of 2 to 12. The closest companion, at only 0.26", is characterised as a 1.4M_{sun}_ stars with an age of 0.6Myr, in excellent agreement with previous age estimates for Tr14. The mass function peaks at about 0.4M_{sun}_ and presents a dearth of stars in the 0.5 to 0.8M_{sun}_ mass range compared to previous estimates of the initial mass function in Tr14.2022A&A...658A.198Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/658/A198CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/549/578 : BV photometry of Trumpler 14 and 16 (Degioia-Eastwood+, 2001)J/ApJ/589/509 : Chandra observations of Trumpler 14 and 16 (Evans+, 2003)J/A+A/515/A26 : H and Ks photometry of Trumpler 14 (Sana+, 2010)J/A+A/603/A81 : Trumpler 14 and 16 in the Carina nebula (Damiani+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/658/A198https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/658/A198http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/658/A198https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/658/A198https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/658/A198http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/658/A198GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/658/A198/table2 (Measured and derived parameters of all detected sources within Tr14)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/658/A198/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/658/A198/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/658/A198/table2?GETtext/xml+votable180.050000true160.989425-59.547570.0055555555555555566/38016https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/658/A198?format=asciiOpticaldefaultJ/A+A/658/A198/table2Measured and derived parameters of all detected sources within Tr14recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget name (1)meta.id;meta.maincharSpTypeSpectral type (1)src.spTypecharRAJ2000Telescope Right ascension (J2000.0) (1)degpos.eq.ra;meta.mainDEJ2000Telescope Declination (J2000.0) (1)degpos.eq.dec;meta.mainObs.dateObservation in Julian Date (1)JDtime.epoch;obsdoubleKMAGAbsolute K-band magnitude (1)magphot.magfloatSourceSource designation within the target (B or SNN)meta.idcharlitSource[A-G] Source designation in the literature, for 6 sourcesmeta.idcharDistradRadial distance of sourcearcsecpos.angDistancedoublee_DistradRadial distance errorarcsecstat.errordoublePAParallactic angle of sourcedegpos.posAngdoublee_PAParallactic angle errordegstat.errordoubledmagYJH? Magnitude contrast in YJH bandsmagphot.mag;arith.difffloatnullablee_dmagYJH? Magnitude contrast error in YJH bandsmagstat.errorfloatnullabledmagK1K1-band magnitude contrastmagphot.mag;arith.diffdoublee_dmagK1K1-band magnitude contrast errormagstat.errordoubledmagK2K2-band magnitude contrastmagphot.mag;arith.diffdoublee_dmagK2K2-band magnitude contrastmagstat.errordoubledmagK1limK1 magnitude contrast limit (2)magphot.mag;arith.diffdoubledmagK2limK2 magnitude contrast limit (2)magphot.mag;arith.diffdoublePspurProbability of spurious associationstat.fit.goodnessdoublelogLLuminosity in logarithmic scale (3)log(mW.m**-2)phys.luminositydoubleTDerived temperature (3)Kphys.temperaturedoubleMassDerived solar mass (3)solMassphys.massdoublee_MassNegative error on Mass (3)solMassstat.error;phys.massdoubleRadDerived solar radius (3)solRadphys.size.radiusdoubleloggDerived surface gravity in logarithmic scale (3)log(cm.s**-2)instr.scaledoubleAgeDerived age (3)Myrtime.agedoublee_AgeNegative error on Age (3)Myrstat.error;time.agedoubleX2chi2 result from derivationstat.fit.chi2doubleE_MassPositive error on Mass (3)solMassstat.error;stat.maxdoubleE_AgePositive error on Age (3)Myrstat.error;stat.maxdouble