J/MNRAS/517/5569ivo://CDS.VizieR/J/MNRAS/517/5569CDSLiu F.Murphy M.T.Lehmann C.Flynn C.Smith D.Kos J.Berke D.A.,Martell S.L.2025-11-24T07:25:48Z2025-11-19T14:43:24ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyg-starsastrometryphotometryvisible-astronomytrigonometric-parallaxstellar-massesstellar-distanceextinctioneffective-temperatureStudies of solar twins have key impacts on the astronomical community, but only ~100-200 nearby solar twins (<1 kpc) have been reliably identified over the last few decades. The aim of our survey (SDST) is to identify ~150-200 distant solar twins and analogues (up to <~4 kpc) closer to the Galactic Centre. We took advantage of the precise Gaia and Skymapper surveys to select Sun-like candidates in a 2-deg field, which were observed with the HERMES spectrograph on the Anglo-Australian Telescope. We successfully built up the required signal-to- noise ratio (25-per-pixel in the HERMES red band) for most targets as faint as Gaia G of 17.4 mag. The stellar photometric/astrometric parameters (e.g. Teff, log g, mass) of our candidates are derived in this paper, while the spectroscopic parameters will be presented in the third paper in this SDST series. The selection success rate - the fraction of targets which belong to solar twins or analogues - was estimated from simulated survey data and the Besancon stellar population model, and compared with the actual success rate of the survey. We find that expected and actual success rates agree well, indicating that the numbers of solar twins and analogues we discover in SDST are consistent with expectations, affirming the survey approach. These distant solar analogues are prime targets for testing for any variation in the strength of electromagnetism in regions of higher dark matter density, and can make additional contributions to our understanding of, e.g. Galactic chemical evolution in the inner Milky Way.2022MNRAS.517.5569Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/517/5569CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)J/MNRAS/499/2196 : Carbon and nitrogen in solar twins (Botelho+, 2020)J/MNRAS/495/3961 : Planet-hosting stars chemical compositions (Liu+, 2020)J/MNRAS/474/2580 : Temporal evolution of neutron-capture elements (Spina+,2018)J/MNRAS/463/696 : M67 solar twins chemical compositions (Liu+, 2016)J/A+A/649/A3 : Gaia Early Data Release 3 photometric passbandsJ/A+A/640/A81 : Abundances of 72 solar-type stars (Nissen+, 2020)J/A+A/639/A127 : Age-chemical-clocks-metallicity relations (Casali+, 2020)J/A+A/619/A73 : Solar Twins age-chromospheric activityJ/A+A/605/A89 : Abundances of microlensed Bulge dwarf stars. VI.J/A+A/589/A17 : Abundance analysis of solar twin HIP 100963J/A+A/574/A124 : Spectroscopy of solar twins and analogues (Datson+, 2015)J/A+A/562/A71 : Chemical abundances of solar neighbourhood dwarfsJ/A+A/558/A53 : Milky Way global survey of star clusters. II.J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)J/ApJ/791/14 : 18 Sco atomic data and equivalent widths (Melendez+, 2014)J/ApJ/865/68 : Abundances for 79 Sun-like stars within 100pc (Bedell+,2018)II/379 : SkyMapper Southern Sky Survey. DR4 (Onken+, 2024)II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)I/352 : Distances to 1.47 billion stars in Gaia EDR3I/350 : Gaia EDR3 (Gaia Collaboration, 2020)I/337 : Gaia DR1 (Gaia Collaboration, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/517/5569https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/517/5569http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/517/5569https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/517/5569https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/517/5569http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/517/5569GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/517/5569/table2 (The stellar information and derived properties of observed solar twins and analogues candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/517/5569/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/517/5569/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/517/5569/table2?GETtext/xml+votable180.050000true227.8894464-39.27513190.0055555555555555565/11009 6/42670-42671 42682 44048https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/517/5569?format=asciiOpticaldefaultJ/MNRAS/517/5569/table2The stellar information and derived properties of observed solar twins and analogues candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaEDR3Unique source identifier from GaiaEDR3 (Gaia_EDR3_ID)meta.id;meta.mainGmagMean magnitude (Vega) (Gaia_G)magphot.mag;em.optfloatPlxAbsolute stellar parallax of the source at the Ep=2016.0 taken from Gaia EDR3 (Parallax)maspos.parallax.trigfloate_PlxStandard error of the stellar parallax at Ep=2016.0 taken from Gaia EDR3 ({sigma}Parallax)masstat.error;pos.parallaxfloatrpgeoDistance taken from Bailer-Jones et al. 2021AJ....161..147B, Cat. I/352 (Distance)pcpos.distance;stat.meanint(BP-RP)0Dereddened colour index as exposed in equation 1 of section 2.3.2 (BP-RP_dred_)magphot.color;em.opt.B;em.opt.RfloatMG-AGAbsolute magnitude in Gaia G less its corresponding exctintion A_G_ as exposed in equation 2 of section 2.3.3 (M_G0_-A_G_)magphys.magAbs;phys.absorption;arith.difffloatTeffEffective temperature derived following the method presented in Casagrande et al. 2021MNRAS.507.2684C and explanations in our section 4.2 (T_eff_)Kphys.temperature.effective;meta.modelledinte_TeffMean standard error of Teff ({sigma}T_eff_)Kstat.error;phys.temperature.effectiveintloggSurface gravity derived with equation 4 of section 4.2 (logg)log(cm.s**-2)phys.gravity;meta.modelledfloate_loggMean standard error of logg ({sigma}logg)log(cm.s**-2)stat.errorfloatM*Stellar masses determined using the Yonsei-Yale isochrones as exposed in section 4.2 (Mass)solMassphys.mass;meta.modelledfloatSkyMapperDisplay the SkyMapper southern sky survey DR1.1 and DR4meta.ref.urlcharGALAHDR3spBLink to download GALAH+DR3 spetrum in Blue bandmeta.ref.urlcharGALAHDR3spRLink to download GALAH+DR3 spetrum in Red bandmeta.ref.urlcharGALAHDR3spILink to download GALAH+DR3 spetrum in Infrared bandmeta.ref.urlchar_RAPosition from I/350/gaiaedr3 GaiaEDR3 catalog (right ascension part)degpos.eq.ra;meta.main_DEPosition from I/350/gaiaedr3 GaiaEDR3 catalog (declination part)degpos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharnullableIDgalahDR3Identifier number from GALAH+ DR3 Buder et al. 2021MNRAS.506..150B, Cat. J/MNRAS/506/150meta.idchar