J/ApJ/942/109ivo://CDS.VizieR/J/ApJ/942/109doi:10.26093/cds/vizier.19420109CDSLei Z.He R.Nemeth P.Vos J.Zou X.Hu KeXiao H.Yan H.Zhao J.2025-02-24T20:13:44Z2024-12-30T13:39:28ZCDS support team

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

cds-question@unistra.frsubdwarf-starsvisible-astronomyspectroscopyeffective-temperaturechemical-abundancestrigonometric-parallaxA total of 222 hot subdwarf stars were identified with LAMOST DR8 spectra, among which 131 stars show composite spectra and have been decomposed, while 91 stars present single-lined spectra. Atmospheric parameters of all sample stars were obtained by fitting hydrogen (H) and helium (He) line profiles with synthetic spectra. Two long-period composite sdB binaries were newly discovered by combining our sample with the non-single-star data from Gaia DR3. One of the new systems presents the highest eccentricity (i.e., 0.5+/-0.09) among known wide sdB binaries, which is beyond model predictions. A total of 15 composite sdB stars fall in the high-probability binary region of the RUWE-AEN plane and deserve priority follow-up observations to further study their binary nature. A distinct gap is clearly presented among temperatures of cool companions for our composite-spectrum sample, but we could not come to a conclusion as to whether this feature is connected to the formation history of hot subdwarf stars before their binary natures are confirmed.2023ApJ...942..109Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/942/109CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/65 : Evolutionary models of evolved stars (Dorman+ 1993)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/ApJ/419/596 : Pop I UV radiation models (Dorman+, 1993)J/A+A/400/939 : Stellar parameters of 115 HQS sdB stars (Edelmann+, 2003)J/A+A/430/223 : Parameters of cool companions of sdB stars (Lisker+, 2005)J/MNRAS/421/2798 : Radial velocity monitoring of PG 1018-047 (Deca+, 2012)J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012)J/ApJ/818/202 : Hot subdwarf stars in LAMOST DR1 (Luo+, 2016)J/A+A/600/A50 : Catalog of hot subdwarf stars (Geier+, 2017)J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diag. (Gaia Collaboration, 2018)J/ApJ/868/70 : Hot subdwarf stars from Gaia DR2 and LAMOST DR5 (Lei+, 2018)J/A+A/621/A38 : Gaia catalogue of hot subluminous stars (Geier+, 2019)J/MNRAS/486/2169 : White dwarf and subdwarf stars in SDSS DR14 (Kepler+, 2019)J/ApJ/881/135 : Hot subdwarf stars from Gaia DR2 & LAMOST. II. (Lei+, 2019)J/ApJ/881/7 : Hot subdwarf stars from LAMOST DR5 & Gaia DR2 (Luo+, 2019)J/A+A/635/A193 : Catalogue of hot subdwarf stars DR2 (Geier, 2020)J/ApJ/889/117 : Hot subdwarf stars from Gaia DR2 & LAMOST. I. (Lei+, 2020)J/A+A/642/A180 : Hot subdwarf stars binarity (Pelisoli+, 2020)J/ApJS/256/28 : Hot subdwarf stars with Gaia DR2 & LAMOST DR7 (Luo+, 2021)J/A+A/662/A40 : Hot subdwarf stars studied with Gaia (Culpan+, 2022)J/A+A/661/A113 : Hot subdwarf stars Rvel variability (Geier+, 2022)J/ApJS/259/5 : Hot subdwarf candidates from LAMOST DR7 (Tan+, 2022)http://www.lamost.org/dr8/v1.0/ : LAMOST DR8 homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/942/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/942/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/942/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/942/109https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/942/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/942/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/942/109/table1 (131 hot subdwarf stars identified with composite spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/942/109/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/942/109/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/942/109/table1?GETtext/xml+votable180.050000true1.02538323.030160.005555555555555556Cone search capability for table J/ApJ/942/109/table2 (91 hot subdwarf stars identified by single-lined spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/942/109/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/942/109/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/942/109/table2?GETtext/xml+votable180.050000true7.474934650.5419490.0055555555555555566/214 285 309 380 478 855 874 921 1012 1154 1335 1374 1433 1542 1672 2039 2106 2180 2316 2333 2363 2445 2704 2783 2785 2873 2877 3248 3250 4150 4156 4271 4329 4449 4473 4663 4716 4754 4770 4800 4817 4872 4886 4905 4907 5036 5236 5345 5356 5369 5655 5698 5847 6175 6196 6385 6497 6547 6561 6674 6722 6991 8212 8319 8339 8543 8608 8670 8688 8699 8729 8759 8829 8928 8930 8982 8998 9024 9035 9046 9119 9268 9330 9432 9485 9501 9553 9624 9727 9886 9905 10060 10094 10188 10309 10335 10400 10439 10475 10489 10514 10552 10624 10782-10783 10825 10888 10919 10945 10973 11159 11524 12023 12358 12412 12451 12608 12627 12672-12673 12684 13169 13266 13286 13483 13784 13807 13827-13828 13830 13841 13955 14888 15137 15152 15200 15301 17851 18125 18142 18149 18344 18557 18854 19099 19109 19419 19903 20150 20215 20237 20314 20344 21830 21879 21939 22105 22317 22428 22474 22480 22517 23133 23173 23207 23421 23545 23736 24028 24162 24196 24292 25927 26184 26402 26416 26444 26517 26570 27087 27099 27259 27478 27731 27754 27814 27823 28185 28224 28388 28398 28440 28625 28646 30196 30442 30459 31359 31386 31411 31419 31564 31624 31627 31759 31775 31816 31818 31833 31838-31839 31860 31955 32330 32354 32603 32627 327621.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/942/109?format=asciiOpticaldefaultJ/ApJ/942/109/table1131 hot subdwarf stars identified with composite spectraAEN[0/16.7] Gaia DR3 astrometric excess noise value (epsi)masstat.fit.paramfloatGmag[10/17.5] Gaia DR3 G band magnitudemagphot.mag;em.optfloatHot-Teff[23550/74200] Hot primary effective temperatureKphys.temperature.effectiveinte_Hot-Teff[20/19720] Uncertainty in Hot-TeffKstat.error;phys.temperature.effectiveintHot-logg[5/7] Hot primary log surface gravitylog(cm.s**-2)phys.gravityfloate_Hot-logg[0.01/1.5] Uncertainty in Hot-logglog(cm.s**-2)stat.error;phys.gravityfloatSimbadSimbad column added by the CDSmeta.ref.urlcharlog(He/H)[-7/2.5] Hot primary log He/H number abundancephys.abundfloate_log(He/H)[0.01/1.4] Uncertainty in log(He/H)stat.error;phys.abundfloatHot-SpCHot primary spectral classsrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000LAMOST Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-3/58] LAMOST Declination (J2000)degpos.eq.dec;meta.mainFlagsPositional flags (G1)meta.code;poscharOBSIDLAMOST observation identifiermeta.id;meta.maincharSNRU[10/328] LAMOST u band signal-to-noise ratiostat.snr;em.opt.UintGaiaGaia DR3 identifiermeta.id.crosscharplx[-0.51/4.02]? Gaia DR3 parallaxmaspos.parallax.trigfloatnullableRUWE[0.7/14.8]? Gaia DR3 RUWE valuestat.errorfloatnullableCool-Teff[3749/8035] Cool secondary effective temperatureKphys.temperature.effectiveintCool-logg[2/5] Cool secondary log surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H][-2.5/0.8] Cool secondary metallicitylog(Sun)phys.abund.FefloatCool-SpCCool secondary spectral classsrc.spTypecharDR7Display data from LAMOST LRS and MRS -DR7 within 1"meta.ref.urlintnullableJ/ApJ/942/109/table291 hot subdwarf stars identified by single-lined spectraSimbadSimbad column added by the CDSmeta.ref.urlcharlog(He/H)[-6.1/3.9] log He/H number abundancephys.abundfloate_log(He/H)[0.01/0.6] Uncertainty in log(He/H)stat.error;phys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000LAMOST Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-6.1/76] LAMOST Declination (J2000)degpos.eq.dec;meta.mainFlagsPositional flags (G1)meta.code;poscharOBSIDLAMOST observation identifiermeta.id;meta.maincharSNRU[10/122] LAMOST signal-to-noise ratiostat.snr;em.opt.UintGaiaGaia DR3 identifiermeta.id.crosscharGmag[11.4/18.4] Gaia DR3 G band magnitudemagphot.mag;em.optfloatTeff[21500/72360] Effective temperatureKphys.temperature.effectiveinte_Teff[30/4720] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlogg[5/7.2] log surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.01/0.6] Uncertainty in logglog(cm.s**-2)stat.error;phys.gravityfloatSpCSpectral classsrc.spTypecharDR7Display data from LAMOST LRS and MRS -DR7 within 1"meta.ref.urlintnullable