J/A+A/444/941ivo://CDS.VizieR/J/A+A/444/941doi:10.26093/cds/vizier.34440941CDSPaunzen E.Schnell A.Maitzen H.M.2017-10-12T12:59:41Z2006-09-13T18:42:02ZCDS support team

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

cds-question@unistra.frb-starseffective-temperaturephotometryWe establish an empirical effective temperature calibration of main sequence, luminosity class V to III B-type stars for the Delta a photometric system which was originally developed to detect magnetic chemically peculiar objects of the upper main sequence (early B-type to early F-type) at 5200A. However, this system provides the index g1-y which shows an excellent correlation with B-V as well as b-y and can be used as an indicator of the effective temperature. This is supplemented by a very accurate color-magnitude diagram, y or V versus g1-y, which can be used, for example, to determine the reddening, distance and age of an open cluster. This makes the Delta a photometric system an excellent tool to investigate the HR diagram in more detail. Using the reddening-free parameters and already established calibrations within the Stromgren uvbybeta, Geneva 7-color and Johnson UBV systems, a polynomial fit of third degree for the averaged effective temperatures to the individual (g1-y)0 values was derived. For this purpose, data from the literature as well as new observations were taken resulting in 225 suitable bright normal B-type objects. The statistical mean of the error for this sample is 238K which is sufficient to investigate the HRD of distant galactic open clusters as well as extragalactic aggregates in the future.2005A&A...444..941Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/444/941CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/391/1039 : Teff of metal-poor A-type stars (Kinman+, 2002)J/A+A/411/559 : Teff for 181 F-K dwarfs (Kovtyukh+, 2003)J/A+A/429/235 : Teff of 119 C-rich giants (Bergeat+, 2005)J/A+A/442/281 : Late-type giants BVRIJHKL and Teff calibrationJ/A+AS/117/227 : Dwarf effective temperatures (Alonso+ 1996)J/A+AS/122/131 : Delta Scuti rotational velocities and Teff (Solano+ 1997)J/ApJ/626/446 : Teff scale of FGK stars (Ramirez+, 2005)J/other/BSAO/38.152 : Teff of CP stars (Glagolevskij 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/444/941https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/444/941http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/444/941https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/444/941https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/444/941http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/444/941GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/444/941/table2 (*List of 225 normal type stars used for the calibration)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/444/941/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/444/941/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/444/941/table2?GETtext/xml+votable180.050000true1.610583164.19616860.0055555555555555566/26 63 161 461 496 1044 1227 1277 1628 1708 1842 2259 2359 2380 2467 2628 2849 2970 3067 3285 3976 4136 6715 12546 12971 13457 13709 13991 14207 14264 14266 14414 14427 14563 15373 15417 15604 16443 16694 16990 17158 18190 19287 19384 19567 20338 20498 20546 20588 20597 20638 20760 20804 20810 20822 20836 20900 20910 20952 20954 20974 20991 21004 21099 21190 21209 21228 21236 21271 21309 21313 21351 21362 21402 21432 21434-21436 21456 21462 21467 21479 21668 21677 22102 22160 22167 22183 22193 22223 22246 22319 22410 22466 22615 22730 22750 22803 22824 22831 22845 22854 22888-22889 22893 22898 22904 22907 22938 22981 22994 23064 23081 23102 23115 23284 23298 23408 23451 23463 23555 23624 23631 23650 23692 23695 23714 24059 24326 24451 30643 30673 31600 31812 32102 32525 32792 32852 33190 33361 33375 33399 33417 33888 34160 34520 34522 34823 35163 35801 35862 36196 37012 37028 37051 37481 37536 37624 37629 37677 37688 37764 37826 37858 37881 38570 38941 39023 39124 39141 39176 39189 39206 39217 39240 39243 39288-39289 39297 39303 39307 39310-39311 39314 39316 39323 39342 39352 39375 39402 39420 39513 39536 39601 39628 39645 39649 39674 39702 39706-39707 39715-39716 39720 39730 39742 39840 39863 39866 39868 39876 39890 39904 39917 39922 40122 40141 46343 46368https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/444/941?format=asciiOpticaldefaultJ/A+A/444/941/table2*List of 225 normal type stars used for the calibrationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD numbermeta.id;meta.mainintHRHR numbermeta.idintVmagV magnitudemagphot.mag;em.opt.Vfloatu-bStroemgren u-b colour indexmagphot.color;em.opt.U;em.opt.BfloatXGeneva reddenning-free parameter Xmagphot.color.reddFreefloat(B-V)0(B-V)0 colour indexmagphot.color;em.opt.B;em.opt.Vfloat(g1-y)0(g1-y)0 colour indexmagphot.colorfloatTeffAdopted effective temperatureKphys.temperature.effectiveinte_TeffError of the adopted TeffKstat.error;phys.temperature.effectiveintSpTypeMK spectral typesrc.spTypecharvsini? vsini (1)km/sphys.veloc.rotatintnullableSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main