J/A+A/619/A132ivo://CDS.VizieR/J/A+A/619/A132doi:10.26093/cds/vizier.36190132CDSChelli A.Duvert G.2018-12-13T12:18:41Z2018-11-15T13:29:46ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyopen-star-clustersstellar-distanceWe demonstrate that reliable photometric distances of stellar clusters, and more generally of stars, can be obtained using pseudomagnitudes and rough spectral type without having to correct for visual absorption. We determine the mean absolute pseudomagnitude of all spectral (sub)types between B and K. Distances are computed from the difference between the star's observed pseudomagnitude and its spectral type's absolute pseudomagnitude. We compare the distances of 30 open clusters thus derived against the distances derived from TGAS parallaxes. Our computed distances, up to distance modulus 12, agree within 0.1mag rms with those obtained from TGAS parallaxes, proving excellent distance estimates. We show additionally that there are actually two markedly different distances in the cluster NGC 2264. We suggest that the pseudomagnitude distance estimation method, which is easy to perform, can be routinely used in all large-scale surveys where statistical distances on a set of stars, such as an open cluster, are required.2018A&A...619A.132Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/619/A132CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/A+A/601/A19 : Gaia DR1 open cluster members (Gaia Collaboration+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/619/A132https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/619/A132http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/619/A132https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/619/A132https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/619/A132http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/619/A132GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/619/A132/table1 (Comparison between the pseudo-photometric and TGAS distances for the 19 van Leeuwen et al., 2017, Cat. J/A+A/601/A19 (fvl17) clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/619/A132/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/619/A132/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/619/A132/table1?GETtext/xml+votable180.050000true66.4717.40.005555555555555556Cone search capability for table J/A+A/619/A132/table2 (Comparison between the pseudo-photometric and TGAS distances for 11 additional clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/619/A132/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/619/A132/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/619/A132/table2?GETtext/xml+votable180.050000true34.059.50.0055555555555555566/463 3136 3256-3257 3604 4298 4698 14059 14210 14645 15121 16490 21529 22056 22862 23547 23637 24228 28483 28711 31790 31812 37231 37592 37790 37933 38016 39181 39354 39739https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/619/A132?format=asciidefaultJ/A+A/619/A132/table1Comparison between the pseudo-photometric and TGAS distances for the 19 van Leeuwen et al., 2017, Cat. J/A+A/601/A19 (fvl17) clustersNameCluster namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCNameCluster namemeta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainpmRAProper motion alogn RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion alogn DEmas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatppdm1Pseudo-photometric distance without proper motion constraintmagphot.mag.distModfloate_ppdm1rms uncertainty on ppdm1magstat.errorfloatn_ppdm1[*] Note on ppdm1 (1)meta.notecharo_ppdm1Number of star for ppdm1 calculationmeta.numberintppdm2? Pseudo-photometric distance with proper motion constraintmagphot.mag.distModfloatnullablee_ppdm2? rms uncertainty on ppdm2magstat.errorfloatnullablen_ppdm2[*] Note on ppdm2 (1)meta.notecharo_ppdm2? Number of star for ppdm2 calculationmeta.numberintnullabletgdm? TGAS distance from van Leeuwen et al., 2017, Cat. J/A+A/601/A19magphot.mag.distModfloatnullablee_tgdm? rms uncertainty on tgdmmagstat.errorfloatnullableo_tgdm? Number of star for tgdm calculationmeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/619/A132/table2Comparison between the pseudo-photometric and TGAS distances for 11 additional clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharCNameCluster namemeta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainpmRAProper motion alogn RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion alogn DEmas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatppdm1Pseudo-photometric distance without proper motion constraintmagphot.mag.distModfloate_ppdm1rms uncertainty on ppdm1magstat.errorfloatn_ppdm1[*] Note on ppdm1 (1)meta.notecharo_ppdm1Number of star for ppdm1 calculationmeta.numberintppdm2? Pseudo-photometric distance with proper motion constraintmagphot.mag.distModfloatnullablee_ppdm2? rms uncertainty on ppdm2magstat.errorfloatnullablen_ppdm2[*] Note on ppdm2 (1)meta.notecharo_ppdm2? Number of star for ppdm2 calculationmeta.numberintnullabletgdm? TGAS distance from van Leeuwen et al., 2017, Cat. J/A+A/601/A19magphot.mag.distModfloatnullablee_tgdm? rms uncertainty on tgdmmagstat.errorfloatnullableo_tgdm? Number of star for tgdm calculationmeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar