J/MNRAS/457/3396ivo://CDS.VizieR/J/MNRAS/457/3396doi:10.26093/cds/vizier.74573396CDSPerez-Fernandez E.Ulla A.Solano E.Oreiro R.Rodrigo C.2024-08-15T20:18:05Z2017-03-06T14:25:33ZCDS support team

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

cds-question@unistra.frearly-type-starssubdwarf-starsinfrared-photometryvisible-astronomysloan-photometryultraviolet-photometryRecent massive sky surveys in different bandwidths are providing new opportunities to modern astronomy. The Virtual Observatory (VO) represents the adequate framework to handle the huge amount of information available and filter out data according to specific requirements. In this work, we applied a selection strategy to find new, uncatalogued hot subdwarfs making use of VO tools. We used large area catalogues like GALEX, Sloan Digital Sky Survey (SDSS), SuperCosmos and Two Micron All Sky Survey (2MASS) to retrieve photometric and astrometric information of stellar objects. To these objects, we applied colour and proper motion filters, together with an effective temperature cutoff, aimed at separating hot subdwarfs from other blue objects such as white dwarfs, cataclysmic variables or main-sequence OB stars. As a result, we obtained 437 new, uncatalogued hot subdwarf candidates. Based on previous results, we expect our procedure to have an overall efficiency of at least 80 per cent. Visual inspection of the 68 candidates with SDSS spectrum showed that 65 can be classified as hot subdwarfs: 5 sdOs, 25 sdOBs and 35 sdBs. This success rate above 95 per cent proves the robustness and efficiency of our methodology. The spectral energy distribution of 45 per cent of the subdwarf candidates showed infrared excesses, a signature of their probable binary nature. The stellar companions of the binary systems so detected are expected to be late-type main-sequence stars. A detailed determination of temperatures and spectral classification of the cool companions will be presented in a forthcoming work.2016MNRAS.457.3396Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/457/3396CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/294 : SDSS Photometric Catalog Release 7 (Adelman-McCarthy+, 2009)J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/457/3396https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/457/3396http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/457/3396https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/457/3396https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/457/3396http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/457/3396GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/457/3396/table1 (Subdwarf candidates with good SED fit)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/457/3396/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/457/3396/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/457/3396/table1?GETtext/xml+votable180.050000true155.06137579.79252780.005555555555555556Cone search capability for table J/MNRAS/457/3396/table2 (Hot sd candidates with IR excess in the SED fit)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/457/3396/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/457/3396/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/457/3396/table2?GETtext/xml+votable180.050000true157.7707580.6110.005555555555555556Cone search capability for table J/MNRAS/457/3396/table3 (Hot sd candidates with bad SED fits)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/457/3396/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/457/3396/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/457/3396/table3?GETtext/xml+votable180.050000true135.00633331.48058330.005555555555555556Cone search capability for table J/MNRAS/457/3396/table4 (Hot sd candidates without IR photometric data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/457/3396/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/457/3396/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/457/3396/table4?GETtext/xml+votable180.050000true120.0131257.67866670.0055555555555555566/85 128 285 309-310 320 400 567 630 635 638 733 921 991 1009-1010 1701 1966 1970-1971 1980 2013 2025 2027 2038-2039 2041 2198 2475 2839 2841 2891-2892 2894 3699 3883-3885 3894 3897 3961 4037 4099 4105-4106 4156 4174 4239 4271 4274 4283 4286 4294 4374 4423 4485 4560 4630 4674 4690 4716 4743 4770 4779 4781-4782 4800 4807 4813 4816-4818 4832 4838 4846 4848 4857 4886 5168 5356 5591 5688 6145 6171 6175 6200 6208 6234 6267 6283 6306 6415 6435 6514 6561 6626 6635 6696 6706-6708 6710 6733 6933 7166 7330 7466 7555 7596 7845 8050 8056 8126 8240 8265 8283 8310 8319 8543 8812 8884 9024 9035 9234 9251 9259 9320 9344 9428 9461 9485 9505 9557-9558 9561 9585 9592-9593 9597 9720 9722-9723 9763 9765 9800-9801 9806 10036 10233 10291 10981 11563 11598 11648 11839 11882 12288 12302 12313 12324-12325 12327-12328 12332 12336 12382 12399 12479 12520 12525 12534 12536-12537 12539 12666 12677 12692 12701 12706 12717 12720 12722 13071 13074 13080 13092 13101 13112 13319 13345 13426 13435 13531 13650-13651 13773 13805 13807 13910 13913 14151 14157 14998 15002 15013 15017 15020 15025 15545 15548-15549 15773 15798-15799 15890 15893 15895 16012 16035 16156 16278 17215 17251 17579 18411 18599 18934 18950 18955 18958 18985 18987 19005 19046 19098 19112 19118 19429 19553 19698 20250 20422 20430 20799 21771 21776 21784 21829 21832 21839 21865 21883 21952 21990 22002 22343 22354 22361 22365 22373 22384 22387 22399 22459 22484 22499 22504 22650 22736 22739 22917 23053 23072 23399 23531 23563 24044 24056 24063 24098-24099 24103 24106 24119 24162 24233 24242-24243 24294-24295 24298 24306 24316 24388 24442 24445 24517 24528 24531-24534 25223 25513 25713 25934 25953 25961 26048 26208 27132 27298 27312 27350 27814 27909 28068 28221 28224 28370 28637 29406-29407 29426-29428 29430 29436 29778 30016 30033 30042 30045 30078 30195 30206-30207 30548 30551 30800 30811 30842 30928 30930 30937 31138 31229 31289 31357 31371 31433-31434 31573-31574 31606 31683 31724 31880-31881 31910 31912 31914 32063 32073-32075 32078 32096 32100 32148-32150 32180-32181 32183 32202 32429 32436 32480 32529 32560 32672 32677 32680 32684 32697 32763 36798 44597 48851 48860 48883 48887 48892 48894 48990 49020 49077 49093 49123 49126 491301.1166583743361574e-19 1.4134638842407062e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/457/3396?format=asciiUVOpticalInfrareddefaultJ/MNRAS/457/3396/table1Subdwarf candidates with good SED fitSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAdegRigth ascension (J2000)degpos.eq.raDEdegDeclination (J2000)degpos.eq.decNUVGALEX NUV magnitude (1)magphot.mag;em.UVdoubleFUVGALEX FUV magnitude (1)magphot.mag;em.UV.100-200nmdoublee_NUVrms uncertainty on NUVmagstat.errordoublee_FUVrms uncertainty on FUVmagstat.errordoubleumag? SDSS DR7 u magnitudemagphot.mag;em.opt.Ufloatnullablegmag? SDSS DR7 g magnitudemagphot.mag;em.opt.Bfloatnullablermag? SDSS DR7 r magnitudemagphot.mag;em.opt.Rfloatnullableimag? SDSS DR7 i magnitudemagphot.mag;em.opt.Ifloatnullablezmag? SDSS DR7 z magnitudemagphot.mag;em.opt.Ifloatnullablee_umag? rms uncertainty on umagmagstat.error;phot.mag;em.opt.Ufloatnullablee_gmag? rms uncertainty on gmagmagstat.error;phot.mag;em.opt.Bfloatnullablee_rmag? rms uncertainty on rmagmagstat.error;phot.mag;em.opt.Rfloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.Ifloatnullablee_zmag? rms uncertainty on zmagmagstat.error;phot.mag;em.opt.IfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.HfloatnullableKmag? 2MASS J magnitudemagphot.mag;em.IR.Kfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable2flag2MASS flag (2)meta.codecharE(B-V)? Redenningmagphot.color.excessdoublenullableRPM? Reduced proper motionphys.magAbsdoublenullableobjIDInternal catalog identifiermeta.idcharTeff1? Effective temperature (best SED fit performed by VOSA)Kphys.temperature.effectivefloatnullableTeffIntEffective temperature interval (3)kKphys.temperature.effectivecharFflagFit flag (4)meta.code.error;meta.modelledintSpTypeSecSecondary component spectral typesrc.spTypecharBandExcPhotometric band from which the excess is detectedinstr.bandpasscharClassMK-like spectral classificationspect.indexcharurlSDSS spectrum urlmeta.ref.urlcharSloanDisplay the online SDSS data for this objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.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/MNRAS/457/3396/table2Hot sd candidates with IR excess in the SED fitobjIDInternal catalog identifiermeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAdegRigth ascension (J2000)degpos.eq.raDEdegDeclination (J2000)degpos.eq.decNUVGALEX NUV magnitude (1)magphot.mag;em.UVdoubleFUVGALEX FUV magnitude (1)magphot.mag;em.UV.100-200nmdoublee_NUVrms uncertainty on NUVmagstat.errordoublee_FUVrms uncertainty on FUVmagstat.errordoubleumag? SDSS DR7 u magnitudemagphot.mag;em.opt.Ufloatnullablegmag? SDSS DR7 g magnitudemagphot.mag;em.opt.Bfloatnullablermag? SDSS DR7 r magnitudemagphot.mag;em.opt.Rfloatnullableimag? SDSS DR7 i magnitudemagphot.mag;em.opt.Ifloatnullablezmag? SDSS DR7 z magnitudemagphot.mag;em.opt.Ifloatnullablee_umag? rms uncertainty on umagmagstat.error;phot.mag;em.opt.Ufloatnullablee_gmag? rms uncertainty on gmagmagstat.error;phot.mag;em.opt.Bfloatnullablee_rmag? rms uncertainty on rmagmagstat.error;phot.mag;em.opt.Rfloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.Ifloatnullablee_zmag? rms uncertainty on zmagmagstat.error;phot.mag;em.opt.IfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.HfloatnullableKmag? 2MASS J magnitudemagphot.mag;em.IR.Kfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable2flag2MASS flag (2)meta.codecharE(B-V)? Redenningmagphot.color.excessdoublenullableRPM? Reduced proper motionphys.magAbsdoublenullableTeff1? Effective temperature (best SED fit performed by VOSA)Kphys.temperature.effectivefloatnullableTeffIntEffective temperature interval (3)kKphys.temperature.effectivecharFflagFit flag (4)meta.code.error;meta.modelledintSpTypeSecSecondary component spectral typesrc.spTypecharBandExcPhotometric band from which the excess is detectedinstr.bandpasscharClassMK-like spectral classificationspect.indexcharurlSDSS spectrum urlmeta.ref.urlcharSloanDisplay the online SDSS data for this objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.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/MNRAS/457/3396/table3Hot sd candidates with bad SED fitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAdegRigth ascension (J2000)degpos.eq.raDEdegDeclination (J2000)degpos.eq.decNUVGALEX NUV magnitude (1)magphot.mag;em.UVdoubleFUVGALEX FUV magnitude (1)magphot.mag;em.UV.100-200nmdoublee_NUVrms uncertainty on NUVmagstat.errordoublee_FUVrms uncertainty on FUVmagstat.errordoubleumag? SDSS DR7 u magnitudemagphot.mag;em.opt.Ufloatnullablegmag? SDSS DR7 g magnitudemagphot.mag;em.opt.Bfloatnullablermag? SDSS DR7 r magnitudemagphot.mag;em.opt.Rfloatnullableimag? SDSS DR7 i magnitudemagphot.mag;em.opt.Ifloatnullablezmag? SDSS DR7 z magnitudemagphot.mag;em.opt.Ifloatnullablee_umag? rms uncertainty on umagmagstat.error;phot.mag;em.opt.Ufloatnullablee_gmag? rms uncertainty on gmagmagstat.error;phot.mag;em.opt.Bfloatnullablee_rmag? rms uncertainty on rmagmagstat.error;phot.mag;em.opt.Rfloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.Ifloatnullablee_zmag? rms uncertainty on zmagmagstat.error;phot.mag;em.opt.IfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.HfloatnullableKmag? 2MASS J magnitudemagphot.mag;em.IR.Kfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable2flag2MASS flag (2)meta.codecharE(B-V)? Redenningmagphot.color.excessdoublenullableRPM? Reduced proper motionphys.magAbsdoublenullableobjIDInternal catalog identifiermeta.idcharTeff1? Effective temperature (best SED fit performed by VOSA)Kphys.temperature.effectivefloatnullableTeffIntEffective temperature interval (3)kKphys.temperature.effectivecharFflagFit flag (4)meta.code.error;meta.modelledintSpTypeSecSecondary component spectral typesrc.spTypecharBandExcPhotometric band from which the excess is detectedinstr.bandpasscharClassMK-like spectral classificationspect.indexcharurlSDSS spectrum urlmeta.ref.urlcharSloanDisplay the online SDSS data for this objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.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/MNRAS/457/3396/table4Hot sd candidates without IR photometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAdegRigth ascension (J2000)degpos.eq.raDEdegDeclination (J2000)degpos.eq.decNUVGALEX NUV magnitude (1)magphot.mag;em.UVdoubleFUVGALEX FUV magnitude (1)magphot.mag;em.UV.100-200nmdoublee_NUVrms uncertainty on NUVmagstat.errordoublee_FUVrms uncertainty on FUVmagstat.errordoubleumag? SDSS DR7 u magnitudemagphot.mag;em.opt.Ufloatnullablegmag? SDSS DR7 g magnitudemagphot.mag;em.opt.Bfloatnullablermag? SDSS DR7 r magnitudemagphot.mag;em.opt.Rfloatnullableimag? SDSS DR7 i magnitudemagphot.mag;em.opt.Ifloatnullablezmag? SDSS DR7 z magnitudemagphot.mag;em.opt.Ifloatnullablee_umag? rms uncertainty on umagmagstat.error;phot.mag;em.opt.Ufloatnullablee_gmag? rms uncertainty on gmagmagstat.error;phot.mag;em.opt.Bfloatnullablee_rmag? rms uncertainty on rmagmagstat.error;phot.mag;em.opt.Rfloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.Ifloatnullablee_zmag? rms uncertainty on zmagmagstat.error;phot.mag;em.opt.IfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.HfloatnullableKmag? 2MASS J magnitudemagphot.mag;em.IR.Kfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable2flag2MASS flag (2)meta.codecharE(B-V)? Redenningmagphot.color.excessdoublenullableRPM? Reduced proper motionphys.magAbsdoublenullableobjIDInternal catalog identifiermeta.idcharTeff1? Effective temperature (best SED fit performed by VOSA)Kphys.temperature.effectivefloatnullableTeffIntEffective temperature interval (3)kKphys.temperature.effectivecharFflagFit flag (4)meta.code.error;meta.modelledintSpTypeSecSecondary component spectral typesrc.spTypecharBandExcPhotometric band from which the excess is detectedinstr.bandpasscharClassMK-like spectral classificationspect.indexcharurlSDSS spectrum urlmeta.ref.urlcharSloanDisplay the online SDSS data for this objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition from SDSS name (declination part)degpos.eq.dec;meta.main