DB white dwarfs in SDSS DR10 and DR12 J/A+A/583/A86 ivo://CDS.VizieR/J/A+A/583/A86 doi:10.26093/cds/vizier.35830086 CDS Koester D. Kepler S.O. 2017-05-31T09:37:35Z 2015-10-30T07:22:06Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr white-dwarf-stars chemical-abundances White dwarfs with helium-dominated atmospheres (spectral types DO, DB) comprise approximately 20% of all white dwarfs. There are fewer studies than of their hydrogen-rich counterparts (DA) and thus several questions remain open. Among these are the total masses and the origin of the hydrogen traces observed in a large number and the nature of the deficit of DBs in the range from 30000-45000K. We use the largest-ever sample (by a factor of 10) provided by the Sloan Digital Sky Survey (SDSS) to study these questions. The photometric and spectroscopic data of 1107 helium-rich objects from the SDSS are analyzed using theoretical model atmospheres. Along with the effective temperature and surface gravity, we also determine hydrogen and calcium abundances or upper limits for all objects. The atmosphere models are extended with envelope calculations to determine the extent of the helium convection zones and thus the total amount of hydrogen and calcium present. 2015A&A...583A..86K https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/583/A86 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/583/A86 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/583/A86 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/583/A86 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/583/A86 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/583/A86 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/583/A86 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/583/A86/table1 (DB stellar parameters) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/583/A86/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/583/A86/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/583/A86/table1? GET text/xml+votable 180.0 50000 true 0.3187083 0.0345694 0.005555555555555556 6/321 546 550 555 671 697 725 727 902 971 998 2010 2033 2063 2074 2180-2181 2203 2206 2229 2298-2299 2303 3965 3967 4097 4112 4121 4129 4135 4143 4150 4165 4175 4178-4180 4182 4189 4195 4202-4203 4207 4211 4223-4225 4228 4238 4252 4254 4262 4271 4283 4289 4291 4297 4301 4312 4385 4417 4435 4450 4467 4476 4484 4500 4524 4530 4539-4540 4544 4555 4560 4608 4623 4632 4634 4649 4654 4658 4664 4676 4687 4697 4710 4736 4742 4746 4757 4759 4762 4764 4770-4774 4784 4793 4801 4804 4808 4818 4821 4823 4826-4827 4840 4856 4858 4861 4865 4868 4874 4893 4898 4945 4950 4956 4967-4968 4972 4993-4994 5023 5025-5026 5037 5071 5093 5099 5105 5112 5135-5136 5151 5160 5165 5175 5180 5198 5205 5219 5230 5248 5254 5261 5267 5331 5343 5353 5358-5359 5367 5372 5399 5410 5415 5421 5435 5457 5470 5478-5479 5493-5494 5511 5525 5538 5545 5547 5559-5560 5580 5597 5605 5646-5647 5649 5671-5672 5691 5711 5714 5720 5743-5744 5746 5754 5757 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11207 11219 11224 11226 11229-11230 11234 11251 11267 11273-11274 11284 11307 11309 11328 11332 11335 11359 11367-11368 11372 11382 11386 11397 11435 11439 11450 11455-11456 11489 11492 11498 11504 11506 11512 11514 11585 11598 11601 11780 11783-11784 11801 11808 11814 11827 11833-11835 11874 11883 11905 11909 11918 11925 11930 11942 11947 11960 11976 12382 12397-12398 12406 12556 12662-12664 12668 13414-13415 13421 13423 13426-13427 13662 14151 14995 15001 15004 16190 16273 16796 17215 17253 17299 17323 17509 17511 17522 17578 17770 17805 17827-17828 17916 18003 18006 18014 18076 18088 18090 18164 18170 18222 18228 18235 18272 18301 18307 18317 18382 18385 18533 18552 18603 18607 18625 18772 18791 18795 18805 18836 18853 18936 18955 19027 19033 19050-19051 19092 19096 19098-19099 19120 19136 19178 19265 19273 19324 19330 19382 19388 19390 19424 19429 19467 19488 19490 19494 19510 19519 19535 19537-19538 19583 19595 19597 19599 19645 19678 19758 19800 19830 19940-19941 19944 19946 19981 19984 19996 20032-20033 20125 20151 20157 20168 20174 20193 20198 20251 20261 20272 20274 20278-20279 20454 20461 20463 21768 21783 21846 21887 21952 21973 21975 21998 22011 22352 22355 22362 22366 22398-22399 22516 22739-22740 23054 23056 23195 23214 23274 23354 23429 24053 24055 25290 25294 25329 25519 25907 25911 25931 25934 25937 25939 25989 26000-26001 26010 26026 26041 26049 26061-26062 26070 26085 26089 26104 26109 26112 26115 26181 26188 26218 26248 26253 26255 26258 26280 26337-26338 26362-26363 26384 26405 26407 26411 26418 26449 26461 26466 26476 26481 26500 26510 26514 26538 26550-26551 26578 26595 26599 26606 26610 26612 26618 26871 26876 26957-26958 26981 26989 27019 27040 27044-27045 27048 27053 27075 27092 27114 27130 27193 27197 27199 27243 27245 27255 27258-27259 27271 27287 27292 27303 27312 27315 27318 27330 27333 27348 27350 27352 27357 27361 27374 27395 27397 27400 27413 27419 27431 27436 27452 27454 27478 27500 27507 27527 27536-27537 27539 27541 27544 27552 27560 27597 27618-27619 27656 27676 27682 27687 27700 27718 27749 27755 27765 27785 27805 27816 27881-27882 27909 27915 27932 27962 27968 27984 28002 28036 28044 28053 28073 28079 28093 28096 28098 28116 28127 28137 28164 28174 28184 28189-28190 28193 28198 28209 28246 28263 28302 28308 28322 28336 28339 28354 28361 28384 28400 28408 28415 28427 28434 28437 28442 28453 28455 28462 28466 28477 28526 28533 28551 28558 28568 28572-28573 28582 28595 28602 28616 28637 28643 28650 31395-31396 31400 31406 31414 31429 31444 31447 31466 31480 31485 31550 31616 31619 31628 31641 31650 31668 31670 31675 31694 31723 31737-31738 31742-31743 32396 32399 32413 32415 32421 32473 32486 32508-32509 32519 32554 32686 32698-32699 36773 36783 36786-36787 36803 36840 36843 36856 36858 36861 45055 48888 48890 49010 49015 49017 49020 49087 49149 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/583/A86?format=ascii default J/A+A/583/A86/table1 DB stellar parameters SimbadName Simbad column added by the CDS meta.id char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name SDSS name, HHMMSS.ss+DDSS.ss meta.id;meta.main char Teff Effective temperature K phys.temperature.effective int e_Teff Error of effective temperature K stat.error;phys.temperature.effective int logg log of surface gravity in cgs units log(cm.s**-2) phys.gravity float e_logg Error of surface gravity log(cm.s**-2) stat.error float S/N Signal-to-noise ratio of spectrum stat.snr float d Distance pc pos.distance int Z Vertical height above galactic plane pc pos.cartesian.z;pos.galactic int [H/He] Hydrogen abundances log N(H)/N(He) phys.abund float e_[H/He] Error of hydrogen abundance stat.error;phys.abund float [Ca/He] Calcium abundance log N(Ca)/N(He) phys.abund float e_[Ca/He] Error of calcium abundance stat.error;phys.abund float Sloan Display the SDSS data for this star meta.ref.url char _RA Positions from SDSS name (right ascension part) deg pos.eq.ra;meta.main _DE Positions from SDSS name (declination part) deg pos.eq.dec;meta.main