J/MNRAS/479/2909ivo://CDS.VizieR/J/MNRAS/479/2909doi:10.26093/cds/vizier.74792909CDSBernhard K.Otero S.Hummerich S.Kaltcheva N.Paunzen E.Bohlsen T.2024-08-18T20:20:37Z2022-07-07T13:33:54ZCDS support team

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

cds-question@unistra.frbe-starsvariable-starsvisible-astronomybroad-band-photometryWe present an investigation of a large sample of confirmed (N=233) and candidate (N=54) Galactic classical Be stars (mean V magnitude range of 6.4-12.6mag), with the main aim of characterizing their photometric variability. Our sample stars were preselected among early-type variables using light-curve morphology criteria. Spectroscopic information was gleaned from the literature, and archival and newly acquired spectra. Photometric variability was analysed using archival ASAS-3 time-series data. To enable a comparison of results, we have largely adopted the methodology of Labadie-Bartz et al. (2017AJ....153..252L, Cat. J/AJ/153/252), who carried out a similar investigation based on KELT data. Complex photometric variations were established in most stars: outbursts on different time-scales (in 73+/-5 per cent of stars), long-term variations (36+/-6 per cent), periodic variations on intermediate time-scales (1+/-1 per cent), and short-term periodic variations (6+/-3 per cent). 24+/-6 per cent of the outbursting stars exhibit (semi)periodic outbursts. We close the apparent void of rare outbursters reported by Labadie-Bartz et al. (2017AJ....153..252L, Cat. J/AJ/153/252) and show that Be stars with infrequent outbursts are not rare. While we do not find a significant difference in the percentage of stars showing outbursts among early-type, mid-type, and late-type Be stars, we show that early-type Be stars exhibit much more frequent outbursts. We have measured rising and falling times for well-covered and well-defined outbursts. Nearly all outburst events are characterized by falling times that exceed the rising times. No differences were found between early-, mid-, and late-type stars; a single non-linear function adequately describes the ratio of falling time to rising time across all spectral subtypes, with the ratio being larger for short events.2018MNRAS.479.2909Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/479/2909CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/479/2909https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/479/2909http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/479/2909https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/479/2909https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/479/2909http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/479/2909GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/479/2909/tablea1 (Essential data for our stars, sorted by increasing right ascension)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/479/2909/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/479/2909/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/479/2909/tablea1?GETtext/xml+votable180.050000true69.56739167-24.658547220.0055555555555555565/9505 10760 6/12374 12915 14373 20728 20817-20818 20851 20959 20980 21507 21534 21632 21651 21656 21673 21689 21741 22045-22046 22113 22121 22123 22173 22214 22224 22249 22253 22260 22432 22835 22896 23629 23632-23633 23658 23672 23675 23679 23762 23766 23821 23950 24180 24291 24333 24369 28683 28692 28697 28699 28719 28794 28802 28823 28826 28838 28851 28866 28877 28880-28881 28883 28895 28901 28917 29032 29076 29082 29094 29097 29101-29102 29112 29158 29161 29172 29941 30210-30211 30221-30222 30227 30240 30293 30321 30415 30632 33097 33826 34777 36977 37184 37207 37213 37225 37229 37236 37245 37247 37267 37280 37321 37327 37329 37331 37334-37335 37338 37340 37342-37343 37349-37351 37359 37365-37367 37371 37373 37375 37682 37685 37700 37703 37708 37717 37723 37731-37732 37755 37824 37833 37867 37872 37893 37901 37905 37907-37909 37913 37916 37923-37924 37926 37928-37929 37932-37933 37939 37943 37950 37958 37962 38018-38019 38024 38026-38027 38031-38032 38034-38035 38051 38058 38446 38563 38628 39003 39214 39236 39268 39270 39368 39417 39517 39734 39751-39752 39768 39770 39780 39783 39789 39929 40074 40458 40620 40671 40677 40696 41020 41387 41425 41439 41461 41521 41528 41577 41592 41624 41630 41653 41658 41670 41680-41681 41685 41697 41704 41712 41749 41754 41771 41781 41812 41846 41854 41872 41925 42128 42143 42148 42160 42162 42175 42185 42221 42224-42225 42281 42286 42291 42297 42314 42356 42388 42417 42456 42485 42636 43011 43017 43023 43031 43033 43036 43046 43048 43106 43150 43448 44038 47771https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/479/2909?format=asciiOpticaldefaultJ/MNRAS/479/2909/tablea1Essential data for our stars, sorted by increasing right ascensionSimbadSimbad column added by the CDSmeta.ref.urlcharSeqSequential numbermeta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGSCIdentification from the Guide Star Catalog (GSC), version 1.2.meta.id;meta.maincharONamesIdentification from the Henry Draper (HD) catalogue or other conventional identifiermeta.idcharRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000 (1)pos.eq.dec;meta.mainVmagl1V magnitude range, as derived from ASAS-3 datamagphot.mag;em.opt.VfloatVmagu1V magnitude range, as derived from ASAS-3 datamagphot.mag;em.opt.Vfloatn_Vmagl1[*] Note on V magnitude range (2)meta.notecharVmagl2V magnitude range, as gleaned from a star's recorded photometric history (cf. Section 2.5)magphot.mag;em.opt.VfloatVmagu2V magnitude range, as gleaned from a star's recorded photometric history (cf. Section 2.5)magphot.mag;em.opt.VfloatSpTypeSpectral type(s) from the literature, with references in refs.dat filesrc.spTypecharsubtype[EMLU] Subtype (3)src.spTypecharEmissionEmission flag (4)meta.codecharVarTypeLVariability type, following LB17 (5)meta.note;src.varcharVarTypeGVariability type, following the GCVS and VSX classificationsmeta.note;src.varcharPer? Period, as derived from analysis of ASAS-3 datadtime.perioddoublenullablee_Per? rms uncertainty on Perioddstat.errordoublenullableJ/MNRAS/479/2909/tabled1Colour indices and colour excesses for our sample stars, sorted by increasing right ascensionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordint(B-V)K? (B-V) index, taken from Kharchenko (2001KFNT...17e.409K, Cat. I/280)magphot.color;em.opt.B;em.opt.Vfloatnullable(B-V)GA? (B-V) index, taken from the GCPD and/or APASS (1)magphot.color;em.opt.B;em.opt.Vfloatnullable(U-B)G? (U-B) index, taken (with very few exceptions) from the GCPDmagphot.color;em.opt.U;em.opt.Bfloatnullable(B-V)0sp? (B-V)0 index, as derived from the spectral typemagphot.color;em.opt.B;em.opt.Vfloatnullable(B-V)0pavg? Average (B-V)0 index, as derived from the available UBV and uvby datamagphot.color;em.opt.B;em.opt.VfloatnullableE(B-V)sp? Colour excess E(B-V), as derived from spectroscopymagphot.color.excessfloatnullableE(B-V)pavg? Average colour excess E(B-V), as derived from the available UBV and uvby datamagphot.color.excess;stat.meanfloatnullableGSCIdentification from the Guide Star Catalog (GSC), version 1.2meta.id;meta.maincharSpTypeinpSpectral type and luminosity class (2)src.spTypecharJ/MNRAS/479/2909/refsReferencesRefReference codemeta.noteintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar