J/MNRAS/496/1881ivo://CDS.VizieR/J/MNRAS/496/1881doi:10.26093/cds/vizier.74961881CDSBlouin S.2025-02-20T20:15:59Z2023-09-28T14:37:27ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starschemically-peculiar-starseffective-temperaturestellar-massesstellar-distanceinfrared-photometryvisible-astronomybroad-band-photometryThe accretion of rocky material is responsible for the presence of heavy elements in the atmospheres of a large fraction of white dwarf stars. Those objects represent a unique opportunity to infer the bulk composition of exoplanetesimals. This chemical characterization requires the use of detailed atmosphere models to determine the elemental abundances at the photospheres of white dwarfs. In this work, we use a state-of-the-art model atmosphere code to reanalyse the first large survey of metal-polluted white dwarfs for which abundances are found for multiple elements. We show that the improved constitutive physics of our models lead to systematically higher Mg abundances than previous analyses. We find an average logMg/Ca number abundance ratio of 1.5. This value is significantly above the reference abundance for chondrites, which is expected as current diffusion models predict that for the cool helium-atmosphere white dwarfs of our sample, Mg should remain in the atmosphere longer than Ca. This helps resolve a recently identified Mg depletion problem, where the planetesimals accreted by white dwarfs were reported to be Mg-deficient compared to the expected composition of their planetary systems.2020MNRAS.496.1881Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/496/1881CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/347 : Distances to 1.33 billion stars in Gaia DR2J/MNRAS/467/4970 : Cool DZ white dwarfs. I. (Hollands+, 2017)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/496/1881https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/496/1881http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/496/1881https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/496/1881https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/496/1881http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/496/1881GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/496/1881/table1 (Observational data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/496/1881/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/496/1881/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/496/1881/table1?GETtext/xml+votable180.050000true0.565221732.15386750.0055555555555555566/670 678 2098 2222 2280 4156 4292 4328 4331 4333 4428 4445 4476 4545 4621 4733 4746 4791 4813 4887 4895 4977 5089 5139 5155 5202 5236 5266 5290 5331 5334 5347 5350 5503 5505 5529 5598 5620 5780 5787 5798 5801 5809 5871 5920 5973-5974 6015 6103 6218 6237 6254-6255 6395 6568 6584 6591 6640 7223 7250 7327 7457 7561 8213 8345 8350 8480 8526 8544 8552 8640 8692 8749 8808 8865 8938 8941 8973 9115 9201 9397 9417 9419 9448 9767 9805 9869 9890 9953 10019 10271 10307 10413 10426 10457 10476 10510 10540 10542 10570 10616 10777 10820 10852 11048 11147 11345 11353 11488 12316 13348 17372 17497 17599 17685 17700 17757 17806 17837 17851 18012 18127 18303 18375 18776 18801 18850 18856 19107 19120 19205 19263 19386 19455 19483 19517 19565 19597 19617 19634 19766 19806 19816 19897 19932 19958 20054 20195 20238 20363 20395 20419 20427 21789 22363 23416 25850 25931 26038 26143 26207 26236 26279 26365 26482 26490 26544 26572 26580 27048 27061 27082 27129 27417 27543 27597 27604 27645 27685 27692 27719 27749 27769 27829 27903 27993 28106 28226 28435 28493 28510 28603 28632 28654 31732 32419 32441 32493 368452.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/496/1881?format=asciiOpticalInfrareddefaultJ/MNRAS/496/1881/table1Observational datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharONameMontreal White Dwarf Database identifiermeta.id;meta.datasetcharumagSDSS u-band magnitudemagphot.mag;em.opt.UfloatgmagSDSS g-band magnitudemagphot.mag;em.opt.BfloatrmagSDSS r-band magnitudemagphot.mag;em.opt.RfloatimagSDSS i-band magnitudemagphot.mag;em.opt.IfloatzmagSDSS z-band magnitudemagphot.mag;em.opt.IfloatDist? Estimated distance from Bailer-Jones (2018AJ....156...58B, Cat. I/347)pcpos.distancefloatnullableb_Dist[]? Lower bound on Dist (68 per cent confidence interval)pcpos.distance;stat.minfloatnullableB_Dist? Upper bound on Dist (68 per cent confidence interval)pcpos.distance;stat.maxfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/496/1881/table2Atmospheric parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveinte_TeffError on TeffKstat.error;phys.temperature.effectiveintloggSurface gravity (1)log(cm.s**-2)phys.gravityfloate_logg? Error on logglog(cm.s**-2)stat.errorfloatnullableMass? Star masssolMassphys.massfloatnullablee_Mass? Error on MasssolMassstat.error;phys.massfloatnullablelogCa/HeLogarithm of the Ca/He abundance ratio (2)phys.abundfloate_logCa/HeError on logCa/Hestat.error;phys.abundfloatlogMg/HeLogarithm of the Mg/He abundance ratio (2)phys.abundfloate_logMg/HeError on logMg/Hestat.errorfloatlogFe/HeLogarithm of the Fe/He abundance ratio (2)phys.abundfloate_logFe/HeError on logFe/Hestat.error;phys.abund.Fefloatl_logH/HeLimit flag on logH/Hemeta.code.error;phys.abundcharlogH/HeLogarithm of the H/He abundance ratio (2)phys.abundfloat