J/A+A/472/241ivo://CDS.VizieR/J/A+A/472/241doi:10.26093/cds/vizier.34720241CDSGerbaldi M.Faraggiana R.Caffau E.2017-07-03T14:25:34Z2007-11-04T21:04:42ZCDS support team

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

cds-question@unistra.frvariable-starsspectroscopic-binary-starsstellar-atmospheresIt seems that the recently identified class of pulsating stars, the gamma Dor type-variables, includes objects with different metal abundances and a large percentage of binaries. We looked for indicators of metal abundance peculiarities and stellar binarity in a sample of 40 confirmed gamma Dor stars. Absolute magnitudes from Hipparcos parallaxes and UV magnitudes, from the S2/S68 experiment on board the TD1 satellite, are retrieved from databases and compared with predicted values. A set of non variable normal stars is used to check the consistency of this analysis and also serve as reference stars. Twenty-nine stars of the gamma Dor star sample, which is 73% of it, are discovered having abnormal UV fluxes constantly showing UV flux excesses compared to those computed with the atmospheric parameters (Teff, logg, and metallicity) determined from calibration of the uvbyBeta indices. The reason for this UV excess of flux at 196.5nm and at 236.5nm, which was previously known only for HD 209295, cannot be ascribed to binarity alone. An extra source of UV flux or less UV absorption - yet unknown - must be present.2007A&A...472..241Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/472/241CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/450/715 : Differential uvby photometry of HD 218427 (Rodriguez+, 2006)J/A+A/456/261 : Differential uvby photometry of HD 239276 (Rodriguez+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/472/241https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/472/241http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/472/241https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/472/241https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/472/241http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/472/241GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/472/241/params (Reddening and atmospheric parameters for the {gamma} Dor stars and a sample of reference stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/472/241/params?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/472/241/params?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/472/241/params?GETtext/xml+votable180.050000true31.5447056-10.27621780.0055555555555555566/339 1888 5258 6073 6154 6257 6424 6539 6706 7560 7759 9293 9857 10907 11204 11349 11770 11917 12598 12695 13313 14144 14807 15019 15621 16289 17398 17404 17458 17486 17491 17608 19989 20125 20793 20835 21285 21803 22269 23405 23503 23514 23518 23523 23525-23526 23536-23537 24218 24793 24842 25685 25746 26783 27130 28025 28423 28838 29680 30318 30375 30475 31094 31763 31939 33584 33976 34217 34577 36832 38074 39149 40400 41397 45029 45032 45469 45983 47825 47928https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/472/241?format=asciiOpticaldefaultJ/A+A/472/241/paramsReddening and atmospheric parameters for the {gamma} Dor stars and a sample of reference starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSSimbad column added by the CDSmeta.id;meta.datasetcharHDHD number (1)meta.id;meta.mainintprimaryn_HD[no] "no" indicates star without Beta-index measurementmeta.notecharf_HDindicates a SB2 of close visual binary star detailed in table3meta.ref.urlcharE(b-y)Reddening computed with the Moon program (2)magphot.color.excessfloatTeff1Effective temperature computed with the Moon & Dworetsky program (MD) (2)Kphys.temperature.effectiveintlogg1Surface gravity computed with the Moon & Dworetsky program (MD) (2)log(cm.s**-2)phys.gravityfloatTeff2? Effective temperature computed with the Kunzli et al. program (Gen) (2)Kphys.temperature.effectiveintnullablelogg2? Surface gravity computed with the Kunzli et al. program (Gen) (2)log(cm.s**-2)phys.gravityfloatnullable[M/H]? Metallicity computed with the Kunzli et al. program (Gen) (2)log(Sun)phys.abund.FefloatnullableVMAG1? Visual absolute magnitude photometrically derived using calibration of uvbyBeta photometry adopted by Moon (1985) (2)magphys.magAbsfloatnullableVMAG0? Visual absolute magnitude derived using Hipparcos parallaxesmagphys.magAbsfloatnullableNote[abcd] Note about binarity (3)meta.notecharRemRemarks (4)meta.notecharSimbadSimbad 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.mainJ/A+A/472/241/table3Visual magnitude for the 10 SB2 or close VB gamma Dor starsHDHD numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_HD[*] * indicates a note in notes.dat filemeta.notecharVmagV-Johnson magnitude from the Hipparcos Catalogue (Cat. <I/239>)magphot.mag;em.opt.VfloatV(A)? V-Johnson magnitude for the component Amagphot.mag;em.opt.VfloatnullableV(B)? V-Johnson magnitude for the component Bmagphot.mag;em.opt.VfloatnullableJ/A+A/472/241/notesIndividual notesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD numbermeta.id;meta.mainintNoteNotemeta.notechar