J/ApJ/653/657ivo://CDS.VizieR/J/ApJ/653/657doi:10.26093/cds/vizier.16530657CDSManoj P.Bhatt H.C.Maheswar G.Muneer S.2017-07-05T06:59:28Z2008-11-28T22:27:28ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsphotometryline-intensitiesWe present optical spectra of 45 intermediate-mass Herbig Ae/Be stars. Together with the multiepoch spectroscopic and photometric data compiled for a large sample of these stars and ages estimated for individual stars by using pre-main-sequence evolutionary tracks, we have studied the evolution of emission-line activity in them. We find that, on average, the H{alpha} emission line strength decreases with increasing stellar age in Herbig Ae/Be stars, indicating that the accretion activity gradually declines during the pre-main-sequence phase.2006ApJ...653..657Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/653/657CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/106/656 : Herbig Ae/Be stars (Brooke+, 1993)J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)J/A+AS/111/399 : Polarization variability in Herbig Ae/Be stars (Jain+, 1995)J/A+AS/136/429 : Herbig Ae/Be stars candidates (Corporon+ 1999)J/AJ/126/2971 : UBVRI photometry of 131 Herbig Ae/Be (Vieira+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/653/657https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/653/657http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/653/657https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/653/657https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/653/657http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/653/657GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/653/657/main (Basic data, masses, ages and H{alpha} equivalent widths for 91 Herbig Ae/Be stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/653/657/main?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/653/657/main?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/653/657/main?GETtext/xml+votable180.050000true2.858208358.824750.005555555555555556Cone search capability for table J/ApJ/653/657/table2 (Log of spectroscopic observations object)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/653/657/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/653/657/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/653/657/table2?GETtext/xml+votable180.050000true10.82583361.9111110.0055555555555555566/1113 1114 1168 1545 1591 3005 3038 3057 3245 13736 14031 14063 14311 14344 14372 14687 14696 15368 15409 15759 15798 15840 15851 16131 21402 21418 21421 21436 21438 21439 21456 21480 21643 22828 22854 22856 23636 23637 23644 23646 23717 23727 23736 23739 23798 23970 24277 24279 24281 24449 28762 28921 29193 29207 30188 30243 30363 31259 32065 36956 37169 37186 37353 37916 37978 38002 39163 39228 41472 42429 42595 42611 42644 42931 42972 44049 44362 478288.650015785639275e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/653/657?format=asciiOpticaldefaultJ/ApJ/653/657/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/ApJ/653/657/table52MASS magnitudes of Herbig Ae/Be starsKsmag2MASS Ks band magnitudemagphot.mag;em.IR.KfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.mainchar2MASSThe 2MASS designation (HHMMSSss+DDMMSSs)meta.idcharJmag2MASS J band magnitudemagphot.mag;em.IR.JfloatHmag2MASS H band magnitudemagphot.mag;em.IR.HfloatDel(H-Ks)Intrinsic (H-Ks) color excess (1)magphot.color.excessfloate_Del(H-Ks)Error on Del(H-Ks)magstat.errorfloatJ/ApJ/653/657/mainBasic data, masses, ages and H{alpha} equivalent widths for 91 Herbig Ae/Be starsSpTypeMK spectral typesrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharprimarySSimbad column added by the CDSmeta.ref.urlcharVmagJohnson V band magnitudemagphot.mag;em.opt.VfloatB-VJohnson (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatRmag? Johnson R band magnitudemagphot.mag;em.opt.Rfloatnullabler_RmagThe photometry reference in refs.dat filemeta.ref;pos.frameint2MSimbad column added by the CDSmeta.ref.urlcharr_SpTypeReference for SpType in refs.dat filemeta.ref;pos.frameintDistDistancepcpos.distance;pos.heliocentricintr_DistReference on Dis in refs.dat filemeta.ref;pos.frameintSimbadSimbad column added by the CDSmeta.refcharlogTLog of the effective temperaturelog(K)phys.temperature.effectivefloatE(B-V)The (B-V) color excessmagphot.color.excessfloatRRatio of total-to-selective extinctionmagphys.absorptionfloatAVThe V band extinctionmagphys.absorption;em.opt.VfloatlogLLog of the luminositylog(solLum)phys.luminosityfloatl_MassLimit flag on Massmeta.code.error;phys.masscharMassDerived masssolMassphys.massfloatl_AgeLimit flag on Agemeta.code.error;time.agecharAgeDerived ageMyrtime.agefloatNow? H{alpha} equivalent width from this work0.1nmspect.line.eqWidth;em.line.HalphafloatnullableHB88? Herbig & Bell (1988, Cat. <V/73>) H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableHer04? Hernandez et al. (2004AJ....127.1682H) H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableCR98? Corcoran & Ray (1998A&A...331..147C) H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableAVD05? Acke et al. (2005A&A...436..209A) H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableBPL96? Reipurth et al. (1996A&AS..120..229R) H{alpha} equivalent width0.1nmspect.line.eqWidthfloatnullableHBCSimbad column added by the CDSmeta.ref.urlchar_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/ApJ/653/657/table2Log of spectroscopic observations objectExpTimeExposure Timestime.duration;obs.exposureintObsObservation datestime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpect/InstSpectrograph/Instrumentmeta.id;instrchar