J/AJ/147/129ivo://CDS.VizieR/J/AJ/147/129doi:10.26093/cds/vizier.51470129CDSSion E.M.Holberg J.B.Oswalt T.D.McCook G.P.Wasatonic R.Myszka J.2026-01-20T12:12:23Z2014-09-25T14:50:20ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsproper-motionsstellar-spectral-typesstellar-distanceWe present the fractional distribution of spectroscopic subtypes, range and distribution of surface temperatures, and kinematical properties of the white dwarfs (WDs) within 25pc of the Sun. There is no convincing evidence of halo WDs in the total 25pc sample of 224 WDs. There is also little to suggest the presence of genuine thick disk subcomponent members within 25pc. It appears that the entire 25pc sample likely belongs to the thin disk. We also find no significant kinematic differences with respect to spectroscopic subtypes. The total DA to non-DA ratio of the 25pc sample is 1.8, a manifestation of deepening envelope convection, which transforms DA stars with sufficiently thin H surface layers into non-DAs. We compare this ratio with the results of other studies. We find that at least 11% of the WDs within 25pc of the Sun (the DAZ and DZ stars) have photospheric metals that likely originate from accretion of circumstellar material (debris disks) around them. If this interpretation is correct, then it suggests the possibility that a similar percentage have planets, asteroid-like bodies, or debris disks orbiting them. Our volume-limited sample reveals a pileup of DC WDs at the well-known cutoff in DQ WDs at T_eff_~6000K. Mindful of small number statistics, we speculate on its possible evolutionary significance. We find that the incidence of magnetic WDs in the 25pc sample is at least 8% in our volume-limited sample, dominated by cool WDs. We derive approximate formation rates of DB and DQ degenerates and present a preliminary test of the evolutionary scenario that all cooling DB stars become DQ WDs via helium convective dredge-up with the diffusion tail of carbon extending upward from their cores.2014AJ....147..129Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/147/129CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wd : Spectroscopically Identified White Dwarfs (McCook+, 2008)III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)I/297 : NOMAD Catalog (Zacharias+ 2005)V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)V/32 : Stars within 25 pc of the Sun (Woolley+ 1970)J/AJ/145/136 : Astrometry & photometry of nearby white dwarfs (Limoges+, 2013)J/ApJ/743/138 : Spectroscopic survey of bright white dwarfs (Gianninas+, 2011)J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)J/ApJS/190/77 : Detailed analysis of cool WDs in the SDSS (Kilic+, 2010)J/AJ/138/1681 : WD within 20pc of the Sun (Sion+, 2009)J/AJ/135/1239 : Spectral distances to DA white dwarfs (Holberg+, 2008)J/AJ/135/1225 : Parameters of the local white dwarfs (Holberg+, 2008)J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)J/A+A/447/173 : 3D-kinematics of WDs from SPY project. II. (Pauli+, 2006)J/A+A/400/877 : White dwarfs 3D kinematics from SPY project (Pauli+, 2003)J/AJ/124/1118 : Radial velocities of high-velocity WDs (Silvestri+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/147/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/147/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/147/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/147/129https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/147/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/147/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/147/129/table1 (Observational data used in space motions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/129/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/129/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/129/table1?GETtext/xml+votable180.050000true0.6670417-34.22766670.005555555555555556Cone search capability for table J/AJ/147/129/table3 (Space motions of white dwarfs within 25pc)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/129/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/129/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/129/table3?GETtext/xml+votable180.050000true0.6670417-34.22766670.0055555555555555566/319 448 897 1077 1381 2183 2263 2364 2366 2497 2536 2733 2808 2973 3122 3222 3345 3393 3682 4067 4375 4566 5050 5065 5097 5261 6104 6328 6436 6554 6576 6619 6705 6721 6934 7252 7267 7478 7519 7652 7740 7817 8480 8483 8894 9458 9501 9651 9739 9985 10131 10169 10173 10696 10699 11131 11193 11645 11784 11984 12157 12268 12362 12738 13013 13103 13263 13295 13391 13904 14391 14586 15209 15280 15335 15462 15620 16078 16158 16433 16440 16697 17181 17331 17568 17625 17685 17733 17879 17967 18133 18139 18415 18474 18556 18700 18902 19042 19135 19141 19265 19434 19987 20155 20371 20404 20940 21194 21479 21691 22149 22214 22300 22345 22392 22638 22709 22870 22936 23036 23174 23235 23333 23457 23497 23591 23619 24409 24713 24778 24795 25084 25250 25255 25712 25792 26299 26321 26386 26396 26471 26740 26916 27538 28271 28559 29777 29855 30093 30195 30415 30694 30697 31179 31549 31637 31677 31735 31956 31973 32436 33011 33015 33198 33243 33322 33384 34026 34586 34756 35059 35079 35412 35490 35790 35957 36416 36567 37464 37473 37477 37523 37890 38188 38955 39421 39534-39535 39602 39709 39807 40070 40283 40623 40747 41017 41099 41109 41125 41638 42700 42760 43239 43537 43805 44291 44639 45110 45173 45177 45201 45649 45782 45921 46598 46709 46777 46841 47148 47476 47957 48358 48621 48728 49125https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/147/129?format=asciidefaultJ/AJ/147/129/table1Observational data used in space motionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the white dwarf (HHMM+DDd.N; B1950)meta.id;meta.maincharprimaryKmeta.ref.urlcharSpTSpectroscopic subtypesrc.spTypecharTeff? Effective temperatureKphys.temperature.effectiveintnullableRAdeg? Right Ascension in decimal degrees (J2000)degpos.eq.ranullableDEdeg? Declination in decimal degrees (J2000)degpos.eq.decnullableDist[2.6/26]? Distance (1)pcpos.distance;pos.heliocentricfloatnullablen_Dist[p s] Method of distance determination (3)meta.notecharpm? Proper motion (2)arcsec/yrpos.pmfloatnullablepmPA? Position angle of proper motion vectordegpos.pm;pos.posAngdoublenullableRefReference (4)meta.ref;pos.framecharS+09Display the data from Sion et al. (2009, cat. J/AJ/138/1681)meta.numberintnullableH+08Display the data from Holberg et al. (2008, cat. J/AJ/135/1225)meta.numberintnullableMC08Display the data from McCook et al. (2008, cat. III/235)meta.numberintnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableSimbadNameSimbad column added by the CDSmeta.idnullableJ/AJ/147/129/table3Space motions of white dwarfs within 25pcNameName of the white dwarf (HHMM+DDd.N; B1950)meta.id;meta.maincharn_Namemeta.notechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTSpectroscopic subtypesrc.spTypecharUvelU vector component of the space motion (1)km/sphys.veloc;pos.cartesian.xfloatVvelV vector component of the space motion (2)km/sphys.veloc;pos.cartesian.yfloatWvelW vector component of the space motion (3)km/sphys.veloc;pos.cartesian.zfloatVTotalTotal space motionkm/sphys.velocfloatSimbadNameSimbad column added by the CDSmeta.idnullable