J/ApJS/181/444ivo://CDS.VizieR/J/ApJS/181/444doi:10.26093/cds/vizier.21810444CDSAgueros M.A.Anderson S.F.Covey K.R.Hawley S.L.Margon B.,Newsom E.R.Posselt B.Silvestri N.M.Szkody P.Voges W.2017-06-21T08:21:46Z2009-12-25T22:18:37ZCDS support team

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

cds-question@unistra.frastronomical-object-identificationvisible-astronomysloan-photometrysurveysThe ROSAT All-Sky Survey (RASS) was the first imaging X-ray survey of the entire sky. Combining the RASS Bright and Faint Source Catalogs (Cat. <IX/10>, 1RXS and <IX/29>) yields an average of about three X-ray sources per square degree. However, while X-ray source counterparts are known to range from distant quasars to nearby M dwarfs, the RASS data alone are often insufficient to determine the nature of an X-ray source. As a result, large-scale follow-up programs are required to construct samples of known X-ray emitters. We use optical data produced by the Sloan Digital Sky Survey (SDSS) to identify 709 stellar X-ray emitters cataloged in the RASS and falling within the SDSS Data Release 1 footprint. Most of these are bright stars with coronal X-ray emission unsuitable for SDSS spectroscopy, which is designed for fainter objects (g>15[mag]). Instead, we use SDSS photometry, correlations with the Two Micron All Sky Survey and other catalogs, and spectroscopy from the Apache Point Observatory 3.5m telescope to identify these stellar X-ray counterparts. Our sample of 707 X-ray-emitting F, G, K, and M stars is one of the largest X-ray-selected samples of such stars. We identify 17 new X-ray-emitting DA (hydrogen) WDs, of which three are newly identified WDs. We report on follow-up observations of three candidate cool X-ray-emitting WDs (one DA and two DB (helium) WDs); we have not confirmed X-ray emission from these WDs.2009ApJS..181..444Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/181/444CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/210 : Spectroscopically Identified White Dwarfs (McCook+, 1999)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/32 : ROSAT Bright Survey (Fischer+, 1998-2000)IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)J/ApJS/117/319 : Northern RASS X-ray sources catalog (Appenzeller+ 1998)J/A+AS/131/197 : F, G and K stars BVRI photometry (Metanomski+ 1998)J/A+A/406/535 : Hamburg/RASS Cat. of optical ident. V3.0 (Zickgraf+, 2003)J/ApJS/149/29 : ROSAT North Ecliptic Pole Survey (Gioia+, 2003)J/A+A/427/387 : QORG catalog of radio/X-ray sources (Flesch+, 2004)http://www.sdss.org : SDSS Home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/181/444https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/181/444http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/181/444https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/181/444https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/181/444http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/181/444GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/181/444/table2 (The CVs and WDs among the RASS/SIMBAD matches)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/181/444/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/181/444/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/181/444/table2?GETtext/xml+votable180.050000true28.9304170.4713890.005555555555555556Cone search capability for table J/ApJS/181/444/table3 (RASS sources with multiple candidate counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/181/444/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/181/444/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/181/444/table3?GETtext/xml+votable180.050000true5.515417-10.2744440.005555555555555556Cone search capability for table J/ApJS/181/444/table4 (Full RASS/SDSS catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/181/444/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/181/444/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/181/444/table4?GETtext/xml+votable180.050000true0.221250.368060.005555555555555556Cone search capability for table J/ApJS/181/444/X-WD (X-ray emitting white dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/181/444/X-WD?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/181/444/X-WD?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/181/444/X-WD?GETtext/xml+votable180.050000true117.77712530.29066670.005555555555555556Cone search capability for table J/ApJS/181/444/table7 (RASS/SIMBAD class II, III, IV, and A stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/181/444/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/181/444/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/181/444/table7?GETtext/xml+votable180.050000true20.1737515.6947220.005555555555555556Cone search capability for table J/ApJS/181/444/table8 (SIMBAD stars with Apache Point Obs. (APO) spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/181/444/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/181/444/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/181/444/table8?GETtext/xml+votable180.050000true6.4675-9.9655560.0055555555555555565/4454 6/521 545 548 550 553 640 4096 4099 4101 4105 4108 4114 4116 4120 4128 4600 4793 4825 5296 5594 5676 5690 5778 6021 6079 6109 6118 6123 6124 6128 6129 6133 6135 6141 6194 6201 6207 6245 6246 6248 6255 6267 6268 6269 6354 6355 6356 6357 6359 6362 6366 6372 6385 6388 6391 6442 6443 6445 6456 6463 6499 6502 6517 6522 6523 6524 6526 6528 6541 6543 6544 6545 6546 6553 6554 6556 6561 6579 6593 6596 6599 6600 6602 6621 6622 6629 7178 7195 7198 7202 7203 7204 7210 7213 7217 7218 7219 7224 7227 7231 7245 7247 7252 7256 7258 7268 7272 7276 7277 7279 7280 7282 7286 7287 7291 7294 7301 7303 7310 7311 7312 7315 7319 7328 7369 7371 7373 7376 7377 7426 7428 7443 7444 7448 7450 7456 7457 7460 7461 7466 7471 7477 7482 7483 7488 7494 7500 7506 7507 7509 7510 7511 7513 7517 7519 7522 7523 7524 7527 7528 7530 7537 7538 7555 7559 7569 8193 8194 8203 8204 8216 8227 8228 8717 9301 9309 9311 9332 9333 9341 9429 9437 9439 9457 9461 9472 9475 9481 9505 9507 9512 9518 9602 9604 9606 9608 9610 9611 9613 9614 9616 9632 9638 9644 9646 9647 9648 9658 9844 9849 9931 9940 9949 9951 9960 9965 9973 9976 9978 9979 9982 9983 9985 9987 9989 9995 9999 10016 10017 10024 10026 10027 10028 10030 10061 10063 10072 10075 10091 10092 10094 10095 10096 10097 10099 10104 10105 10113 10121 10145 10147 10154 10181 10182 10183 10188 10190 10191 10192 10194 10200 10202 10203 10214 10215 10221 10223 10224 10226 10234 10560 11082 11126 11195 11222 11231 11256 11263 11333 11339 11342 11346 11348 11352 11353 11355 11359 11364 11365 11368 11371 11373 11377 11382 11384 11389 11391 11444 11445 11446 11453 11456 11457 11458 11460 11462 11465 11466 11467 11471 11475 11478 11480 11481 11482 11490 11494 11495 11496 11500 11505 11520 11587 11588 11589 11591 11593 11597 11598 11599 11600 11602 11608 11617 11620 11789 11797 11800 11804 11807 11812 11813 11815 11818 11823 11824 11825 11832 11835 11837 11845 11847 11848 11850 11853 11854 11872 11874 11880 11882 11883 11904 11907 11913 11934 11937 11940 11941 11943 11946 11948 11949 11952 11954 17230 17231 17234 17237 17238 17242 17250 17256 17406 17471 17491 17493 17494 17497 17499 17502 17510 17518 17522 17555 17557 17572 17576 17579 17601 17662 17665 17668 17669 17725 17752 17764 17778 17810 17815 17820 17827 17831 17835 17858 17999 18007 18010 18014 18024 18028 18062 18072 18073 18076 18081 18089 18090 18092 18112 18300 18301 18302 18367 18386 18402 18410 18413 18769 18773 18774 18787 18796 18797 18798 18835 18836 18838 18844 18950 19404 19456 19750 19751 19756 19777 21849 21851 21852 21853 21862 21866 21868 21870 21877 21884 21885 21954 21955 21958 21963 21968 23047 23055 23057 23058 23062 23064 23065 23075 23080 23101 23195 23203 23207 23212 23213 23214 23218 23233 25566 25581 25590 25594 25599 25944 25948 25959 25964 25971 25977 25982 26009 26023 26038 26044 26045 26054 26080 26164 26169 26188 26195 26211 26217 26222 26238 26248 26250 26258 26266 26268 26270 26275 26280 26283 26294 26298 26314 26319 26324 26334 26340 26343 26345 26376 26377 26380 26382 26383 26386 26394 26411 26413 26416 26879 26911 26943 26954 26957 26965 26967 26969 26971 26974 26997 27003 27004 27006 27021 27037 27048 27056 27068 27073 27074 27075 27080 27081 27089 27094 27096 27099 27107 27108 27109 27111 27113 27115 27199 27215 27218 27219 27224 27235 27242 27243 27250 27253 27256 27263 27279 27283 27305 27306 27309 27310 27311 27317 27319 27320 27321 27323 27325 27326 27333 27334 27337 27338 27339 27353 27362 27363 27396 27397 27406 27410 27411 27415 27418 27426 27430 27436 27524 27649 27658 27661 27666 27675 27677 27680 27685 27690 27692 27694 31145 31295 31318 31324 31334 31340 31375 31382 31386 31395 31396 31397 31399 31404 31406 31409 31417 31423 31425 31433 31437 31439 31440 31457 32397 32476 32478 32497 32499 32500 32502 32503 32508 32650 32674 36607 36703 36726 36727 36765 36774 36778 36780 48990 48991 49014 49015 49017 49019 49092 49094 49102 49103 49112 491248.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/181/444?format=asciiOpticaldefaultJ/ApJS/181/444/table2The CVs and WDs among the RASS/SIMBAD matchesCtsROSAT count rates**-1phot.count;em.X-rayfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXS1RXS designation (HHMMSS.s+DDMMSS)meta.id;meta.mainchare_CtsError on Countss**-1stat.errorfloatXIDCounterpart name in Simbad (WD or V*)meta.idcharOffsetOffset between X-ray source and optical counterpartarcsecpos;arith.difffloatBmag? Simbad B-band magnitudemagphot.mag;em.opt.BfloatnullableVmag? Simbad V-band magnitudemagphot.mag;em.opt.VfloatnullableTypeObject type (1)src.spTypechar_RAPosition, from 1XRS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 1XRS name (declination part)degpos.eq.dec;meta.mainJ/ApJS/181/444/table3RASS sources with multiple candidate counterpartsObTSimbad object typesrc.classcharXIDSimbad counterpartmeta.id.assoccharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXSName (HHMMSS.s+DDMMSS)meta.id;meta.maincharCts? ROSAT counts rates**-1phot.count;em.X-rayfloatnullablee_Cts? Error on Countss**-1stat.errorfloatnullableSDSSName (HHMMSS.ss+DDMMSS.s)meta.id.crosscharOffsetOffset between X-ray source and SDSS counterpartarcsecpos;arith.difffloatgmagSDSS g-band magnitudemagphot.mag;em.opt.Bfloate_gmagError on gmagmagstat.error;phot.mag;em.opt.BfloatJmag? 2MASS J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Error on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableFX/FJLog ratio of RASS X-ray to 2MASS J band fluxesphot.flux;arith.ratiofloatf_FX/FJ[b] FX/FV ratio (1)meta.codecharSpASpectral Type (from Apache Point Obs.)src.spTypecharVmag? Simbad V-band magnitudemagphot.mag;em.opt.VfloatnullableFX/FV? Corresponding Simbad log(FX/F_V_)phot.flux;arith.ratiofloatnullableSpTSimbad spectral typesrc.spTypecharf_XID[a] Problem with position in Simbad (2)meta.codecharSloanDisplay the SDSS data for this sourcemeta.ref.urlchar_RAPosition, from 1XRS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 1XRS name (declination part)degpos.eq.dec;meta.mainJ/ApJS/181/444/table4Full RASS/SDSS catalogf_1RXSFlag on RASS (2)meta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXSRASS Name (HHMMSS.s+DDMMSS +1RXS J)meta.id;meta.maincharRAJ2000RASS Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000RASS Declination in decimal degrees (J2000)degpos.eq.dec;meta.maine_PosRASS position uncertainty (1)arcsecstat.errorintCRateRASS count ratect/sphot.count;em.X-raydoublee_CRateUncertainty in CRatect/sstat.errordoubleExpRASS exposure timestime.duration;obs.exposureintHR1First hardness ratio (3)phot.flux;arith.ratiofloate_HR1Uncertainty in HR1stat.errorfloatHR2Second hardness ratio (3)phot.flux;arith.ratiofloate_HR2Uncertainty in HR2stat.errorfloatExtSource extentarcsecphys.angSizeintELExtent likelihood (See Voges et al., 1999, Cat. <IX/10>)stat.likelihoodintDLDetection likelihood (See Voges et al., 1999, Cat. <IX/10>)stat.likelihoodintSDSSSDSS identification (HHMMSS.ss+DDMMSS.s)meta.id.crosscharf_SDSSFlags on SDSS (4)meta.codecharRA2degSDSS Right Ascension in decimal degrees (J2000)degpos.eq.raDE2degSDSS Declination in decimal degrees (J2000)degpos.eq.decdoubleoffS-ROffset from SDSS and RASS positionsarcsecpos;arith.difffloatumagSDSS u band PSF magnitudemagphot.mag;em.opt.Ufloate_umagUncertainty in umagmagstat.error;phot.mag;em.opt.UfloatgmagSDSS g band PSF magnitudemagphot.mag;em.opt.Bfloate_gmagUncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatrmagSDSS r band PSF magnitudemagphot.mag;em.opt.Rfloate_rmagUncertainty in rmagmagstat.error;phot.mag;em.opt.Rfloatimag? SDSS i band PSF magnitudemagphot.mag;em.opt.Ifloatnullablee_imagUncertainty in imagmagstat.error;phot.mag;em.opt.Ifloatzmag? SDSS z band PSF magnitudemagphot.mag;em.opt.Ifloatnullablee_zmagUncertainty in zmagmagstat.error;phot.mag;em.opt.Ifloat2MASS2MASS identification (HHMMSSss+DDMMSSs)meta.idcharq_2MASSQuality flags on 2MASS (5)meta.code.qualcharRA3deg2MASS Right Ascension in decimal degrees (J2000)degpos.eq.raDE3deg2MASS Declination in decimal degrees (J2000)degpos.eq.decdoubleoffS-2Offset from SDSS and 2MASS positionsarcsecpos;arith.difffloatJmag2MASS J band magnitudemagphot.mag;em.IR.Jfloate_Jmag? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag2MASS H band magnitudemagphot.mag;em.IR.Hfloate_HmagUncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatKsmag? 2MASS K_S_ band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.KfloatnullableFX/FJLog ratio of RASS X-ray to 2MASS J band fluxesphot.flux;arith.ratiofloatKsMAG? Synthetic absolute K_S_ band magnitudemagphys.magAbs;em.IR.Kfloatnullablee_KsMAG? Uncertainty in KsMAGmagstat.errorfloatnullableDist? Star distance (corresponding to KsMAG)pcpos.distance;pos.heliocentricfloatnullablee_Dist? Uncertainty in Distpcstat.errorfloatnullableLX? RASS X-ray luminosity in erg/s1e-07Wphys.luminosity;em.X-raydoublenullablee_LX? Uncertainty in LX1e-07Wstat.errordoublenullableObs? Year of the APO observation (6)time.epoch;obsnullableTypeSource spectral typesrc.spTypecharSimbadSimbad identificationmeta.idcharRA4deg? Simbad Right Ascension in decimal degrees (J2000)degpos.eq.ranullableDE4deg? Simbad Declination in decimal degrees (J2000)degpos.eq.decdoublenullableoffS-Si? Offset from SDSS and Simbad positionsarcsecpos;arith.difffloatnullableBmag? Simbad B band magnitudemagphot.mag;em.opt.BfloatnullableVmag? Simbad V band magnitudemagphot.mag;em.opt.VfloatnullableFX/FV? Log ratio of RASS X-ray to Simbad V band fluxesphot.flux;arith.ratiofloatnullableClassSimbad classification (7)src.classcharNoteAdditional note(s) (8)meta.notecharSloanDisplay the SDSS data for this sourcemeta.ref.urlcharJ/ApJS/181/444/X-WDX-ray emitting white dwarfsTypeType (for Table 6)src.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharf_SDSS[bc] Individual notes (1)meta.codecharTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? Error on TeffKstat.error;phys.temperature.effectiveintnullableu_TeffUncertainty flag on Teffmeta.code.error;phys.temperature.effectivechar1RXSName (HHMMSS.s+DDMMSS)meta.idcharOffsetOffset between SDSS and X-ray sourcesarcsecpos;arith.difffloatCtsCountss**-1phot.count;em.X-rayfloate_CtsError on countss**-1stat.errorfloatFX/FGLog ratio of RASS X-ray to SDSS g-band fluxesphot.flux;arith.ratiofloatf_FX/FG[a] Flag on Log(FX/FG) (2)meta.codecharXIDMcCook & Sion (1999, Cat. <III/210>) WD designationmeta.idcharf_XID[u] uncertain identifications (3)meta.codecharSloanDisplay the SDSS data for this sourcemeta.ref.urlchar_RAPosition, from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from SDSS name (declination part)degpos.eq.dec;meta.mainJ/ApJS/181/444/table7RASS/SIMBAD class II, III, IV, and A stars1RXSName (HHMMSS.s+DDMMSS)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCtsCountss**-1phot.count;em.X-rayfloate_CtsError on countss**-1stat.errorfloatNameHD, BD, CCDM or V* designationmeta.id.crosscharOffsetOffset between X-ray source and optical counterpartarcsecpos;arith.difffloatVmagV-band magnitudemagphot.mag;em.opt.VfloatFX/FVLog ratio of RASS X-ray to Simbad V band fluxesphot.flux;arith.ratiofloatSpTypeSpectral typesrc.spTypecharOTypeObject type (1)src.spTypechar_RAPosition, from 1XRS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 1XRS name (declination part)degpos.eq.dec;meta.mainJ/ApJS/181/444/table8SIMBAD stars with Apache Point Obs. (APO) spectraObsDateFirst APO observation datetime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXSName (HHMMSS.S+DDMMSS)meta.id;meta.maincharf_1RXS[c] Non-secure Fx/Fopt estimation (3)meta.codecharSDSSName (HHMMSS.ss+DDMMSS.s)meta.idcharf_SDSS[f] Possibly several counterparts (1)meta.codecharoff1Offset between RASS & SDSS positionsarcsecpos;arith.difffloatXIDCounterpart Simbad namemeta.idcharf_XID[abcdegh, ] Flag on Simbad name (2)meta.codecharoff2Offset between SDSS & Simbad positionsarcsecpos;arith.difffloatSpT2Published spectral typesrc.spTypecharSpAApache Point Obs. Spectral typesrc.spTypecharSloanDisplay the SDSS data for this sourcemeta.ref.urlchar_RAPosition, from 1XRS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 1XRS name (declination part)degpos.eq.dec;meta.main