J/MNRAS/526/5800ivo://CDS.VizieR/J/MNRAS/526/5800CDSSahu S.Gansicke B.T.Tremblay P.-E.Koester D.Hermes J.J.,Wilson D.J.Toloza O.Hoskin M.J.Farihi J.Manser C.J.Redfield S.2023-11-20T11:23:37Z2023-11-20T12:22:32ZCDS support team

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

cds-question@unistra.frsurveyswhite-dwarf-starsspectroscopyultraviolet-astronomyeffective-temperaturestellar-massesstellar-agesWhite dwarf studies carry significant implications across multiple fields of astrophysics, including exoplanets, supernova explosions, and cosmological investigations. Thus, accurate determinations of their fundamental parameters (Teff and log g) are of utmost importance. While optical surveys have provided measurements for many white dwarfs, there is a lack of studies utilising ultraviolet (UV) data, particularly focusing on the warmer ones that predominantly emit in the UV range. Here, we present the medium-resolution far-UV spectroscopic survey of 311 DA white dwarfs obtained with Cosmic Origins Spectrograph (COS) onboard Hubble Space Telescope confirming 49 photometric Gaia candidates. We used 3D extinction maps, parallaxes, and hydrogen atmosphere models to fit the spectra of the stars that lie in the range 12000<Teff<33000K, and 7<=logg<9.2. To assess the impact of input physics, we employed two mass-radius relations in the fitting and compared the results with previous studies. The comparisons suggest the COS Teff are systematically lower by 3 per cent on average than Balmer line fits while they differ by only 1.5 per cent from optical photometric studies. The mass distributions indicate that the COS masses are smaller by approximately 0.05M_{sun}_ and 0.02M_{sun}_ than Balmer lines and photometric masses, respectively. Performing several tests, we find that the discrepancies are either arising due to issues with the COS calibration, broadening theories for hydrogen lines, or interstellar reddening which needs further examination. Based on comparative analysis, we identify 30 binary candidates drawing attention for follow-up studies to confirm their nature.2023MNRAS.526.5800Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/526/5800CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/505/441 : UVES/VLT spectra of white dwarfs. III (Koester+ 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/526/5800https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/526/5800http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/526/5800https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/526/5800https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/526/5800http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/526/5800GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/526/5800/table1 (UV spectroscopic parameters from HST COS survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/526/5800/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/526/5800/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/526/5800/table1?GETtext/xml+votable180.050000true22.5059618986426.649460057030.0055555555555555566/220 279 326 419 538 709 748 894 1088 1248 1554 1787 1869 2099 2138 2184 2771 2776 2789 2816 3121 3210 3213 3821 3983 4458 4493 4623 4668 4727 4832 5032 5109 5118 5166 5190 5434 5439 5450 5569 5636 5760 5927 6008 6118 6452 6579 6594 6808 6935 7265 7312 7325 7483 7498 7606 7672 7750 7958 8280 8295 8442 8475 8546 8683 8965 9044 9066 9072 9075 9104 9134 9165 9261 9305 9463 9484 9562 9602 9610 9627 9663 9747 9901 10297 10451 10462 10504 10637 10968 11027 11217 11322 11369 11415 11465 11529 11642 11680 11712 12022 12127 12348 12438 12541 12746 12901 12936 13237 13295 13321-13322 13327 13352 13440 13839 13842 14909 15114 15209 15220 15256 15738 15784 15944 15968 16089 16158 16303 16438 16451 16599 16614 16857 16928 16955 17007 17685 18180 18246 18341 18497 18560 18562 18652 18972 19251 19428 19508 19629 19702 19819 19979 20152 20380 20404 21554 21966 22051 22277 22675 22857 22932 23013 23151 23174 23241 23476 23495 23516 23544 23561 23795 23804 24264 24365 24416 24595 24659 25034 25079 25276 25326 25480 25607 25634 25792 25943 26108 26258 26305 26326 26420 26495 27247 27338 27594 27631 27934 28002 28092 28183 28212 28243 28523 28559 28574 28679 28716 28890 28983 29265 29326 29341 29723 30036 30465 30569 30613 30694 30767 30892 31290 31375 31451 31528 31670 31690 31907 32134 32341 32458 32574 32608 32622 32715 33313 33514 33873 33940 33959 34310 34398 34405 34625 34864 34930 34975 35258 35376 35596 35626 35790 36063 36081 36469 36661 36793 37135 37227 37490 37626 37646 37847 38007 38749 38803 38941 39336 39998 40115 40241 40273 40472 40518 40879 40896 41157 41755 41874 41986 42038 43130 43290 43928 43930 44328 44796 45632 45649 45802 45834 46285 46358 46627 47032 47047 47050 47203 47344 47459 48025 48259 48378 48670 48863 49058https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/526/5800?format=asciiUVdefaultJ/MNRAS/526/5800/table1UV spectroscopic parameters from HST COS surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmoreindicates PS and/or updated parameters in tables 2 and/or 3meta.ref.urlcharObjectWD name used in this workmeta.id;meta.maincharprimaryWDJWDJ J2000 Name (WDJHHMMSS.ss+DDMMSS.ss)meta.idcharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeffmontEffective temperature from mont (1)Kphys.temperature.effectiveinte_plxmontFit error in parallax from mont (1)masstat.errorfloate_plxlpFit error in parallax from lp (1)masstat.errorfloattAgemontCooling age from mont in million years (1)Myrtime.ageinttAgelpCooling age from lp in million years (1)Myrtime.ageintchi2chi2 from the fittingstat.fit.chi2floatGaiaDR3Gaia DR3 IDmeta.idSimbadNameSimbad column added by the CDSmeta.idcharnullablee_TeffmontUncertainty in effective temperature from mont (1)Kstat.errorintTefflpEffective temperature from lp (1)phys.temperature.effectiveinte_TefflpUncertainty in effective temperature from lp (1)stat.errorintloggmontSurface gravity from mont (1)log(cm.s**-2)phys.gravityfloate_loggmontUncertainty in surface gravity from mont (1)log(cm.s**-2)stat.errorfloatce-loggmontUncertainty in surface gravity from mont for 1sigma confidence ellipse (1)log(cm.s**-2)stat.errorfloatlogglpSurface gravity from lp (1)log(cm.s**-2)phys.gravityfloate_logglpUncertainty in surface gravity (1)log(cm.s**-2)stat.errorfloatce-logglpUncertainty in surface gravity from lp for 1sigma confidence ellipse (1)log(cm.s**-2)stat.errorfloatMassmontMass from mont (1)solMassphys.massfloate_MassmontUncertainty in mass from mont (1)solMassstat.errorfloatMasslpMass from lp (1)solMassphys.massfloate_MasslpUncertainty in mass from lp (1)solMassstat.errorfloatplxParallax from Gaia DR3maspos.parallax.trigfloatJ/MNRAS/526/5800/table2Photometric parameters from Pan-STARRS datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectWD namemeta.id;meta.maincharTeffPSEffective temperature from Pan-STARRS dataKphys.temperature.effectiveinte_TeffPSUncertainty in effective temperature from Pan-STARRS dataKstat.errorintloggPSSurface gravity from Pan-STARRS datalog(cm.s**-2)phys.gravityfloate_loggPSUncertainty in surface gravity from Pan-STARRS datalog(cm.s**-2)stat.errorfloatMassPSMass from Pan-STARRS datasolMassphys.massfloate_MassPSUncertainty in mass from Pan-STARRS datasolMassstat.errorfloatJ/MNRAS/526/5800/table3Updated optical spectroscopic parameters from SPY survey (Koester et al., Cat. J/A+A/505/441)loggK09uSurface gravity from SPY surveylog(cm.s**-2)phys.gravityfloate_loggK09uUncertainty in surface gravity from SPY surveylog(cm.s**-2)stat.errorfloatS/NSignal to noisestat.snrfloatObjectWD namemeta.id;meta.maincharchi2chi2 from the fittingstat.fit.chi2floatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffK09uEffective temperature from SPY surveyKphys.temperature.effectiveinte_TeffK09uUncertainty in effective temperature from SPY surveyKstat.errorint