J/A+A/581/A138ivo://CDS.VizieR/J/A+A/581/A138doi:10.26093/cds/vizier.35810138CDSBernhard K.Huemmerich S.Otero S.Paunzen E.2017-10-11T05:13:36Z2016-03-09T12:06:23ZCDS support team

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

cds-question@unistra.frvariable-starspeculiar-variable-starsThe (magnetic) chemically peculiar (CP) stars of the upper main sequence are well-suited laboratories for investigating the influence of magnetic fields on the stellar surface because they produce abundance inhomogeneities (spots), which results in photometric variability that is explained in terms of the oblique rotator model. CP stars exhibiting this phenomenon are normally classified as {alpha}^2^ Canum Venaticorum (ACV) variables. It is important to increase the sample of known rotational periods among CP stars by discovering new ACV variables. An increased sample size will contribute to the understanding of the CP stars' evolution in time. We aim at discovering new ACV variables in the public data of the third phase of the All Sky Automated Survey (ASAS-3). Furthermore, by analysis of the available photometric data, we intend to derive rotational periods of the stars. The ASAS-3 data were cross-correlated with the Catalogue of Ap, HgMn, and Am stars in order to analyse the light curves of bona fide CP and related stars. The light curves were downloaded and cleaned of outliers and data points with a flag indicating bad quality. Promising candidates showing a larger scatter than observed for constant stars in the corresponding magnitude range were searched for periodic signals using a standard Fourier technique. Objects exhibiting periodic signals well above the noise level were considered and visually inspected, whereas borderline cases were rejected. In total, we found 323 variables, from which 246 are reported here for the first time, and 77 were probably wrongly classified before. The observed variability pattern of most stars is in accordance with an ACV classification. For some cases, it is difficult to distinguish between the light curves of double-waved ACVs and the variability induced by orbital motion (ellipsoidal variables/eclipsing variables), especially for objects exhibiting very small amplitudes and/or significant scatter in their light curves. Thus, some eclipsing or rotating ellipsoidal variables might be present. However, we are confident that the given periods are the correct ones. There seems to be a possible weak correlation between the rotational period and colour, in the sense that cooler magnetic CP stars rotate more slowly. However, this correlation seems to disappear when correcting for the interstellar reddening. The next steps have to include a compilation of all available rotational periods from the literature and a detailed investigation of the astrophysical parameters of these stars. This includes a determination of the individual masses, luminosities, ages, and inclination angles. However, this information cannot be straightforwardly determined from photometric data alone.2015A&A...581A.138Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/581/A138CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/260 : General Catalogue of Ap and Am stars (Renson+ 2009)http://www.astrouw.edu.pl/asas : ASAS-3 Home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/581/A138https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/581/A138http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/581/A138https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/581/A138https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/581/A138http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/581/A138GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/581/A138/tablea1 (Essential data for the 316 stars identified as photometrically variable chemically peculiar stars or star candidates in the present paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/581/A138/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/581/A138/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/581/A138/tablea1?GETtext/xml+votable180.050000true24.06291667-68.251494440.0055555555555555566/12772 12936 20671 20703 20754 20759 20761 20766 20810 20818 20837 20849 20883 20944 20948 20959 20987 21269 21289 21349 21376 21393 21513 21515 21519 21529 21545 21552 21578 21637 21644 21664 21671-21672 21691 21702 21711 22020 22038 22070 22083 22115 22130 22169 22171 22192 22212 22224 22271 22414 22857 22894 22927 23570 23634 23705 23871 24934 27213 28680 28712 28750 28807 28853 28856 28959 28967 29005 29259 29293 29446 29456 29742 29824 29924 29984 30108 30306 30505 30583 30606 31096 32128 32207 33335 34792 36959 37065 37124 37133 37154 37265 37274 37291 37302-37303 37308 37320 37322 37330 37333 37342 37347 37349-37350 37358 37367 37370 37373 37469 37574 37581 37592 37594 37599 37629 37633 37681 37698 37701-37702 37706 37714 37728 37745 37758 37800 37804 37807 37809 37813-37814 37818 37820-37821 37825 37831-37832 37866 37868 37874 37880 37891 37900 37937 37939 37969 37994 38015 38018 38026 38028 38033 38035 38040 38043-38044 38050 38054 38081 38149 38225 38245 38414 38436 38438 38441 38540 38569 38577 38899 39020 39027 39175 39180 39188 39191 39194-39195 39209 39219-39220 39225 39236 39241 39306 39342 39344 39372 39389 39405 39449 39485 39531 39533 39605 39642 39691-39692 39699 39713 39728 39768 39803 39842 39849 39859 39864 39867 39883-39884 39886 39900 39910 39914 39925 39927 39963 39980 40079 40082 40094 40185 40236 40379 40431 40598 40608 40610 40890 40911 41119 41176 41211 41363 41384 41395-41396 41404 41461 41484 41539 41557 41593 41658 41670 41673-41674 41709 41729 41737 41775 41798 41807 41848 41858 41861 41925 41943 41994 42027 42143 42147 42149 42152-42153 42156 42165 42167 42176 42197 42230 42258-42259 42276 42290 42300 42313 42358 42378 42385 42402 42448 42475 42482 42514 42752 42774 42782 42840 42869 43018 43040 43042 43064 43073 43085 43133 43137 43237 43891 45360 47345 47650 47788 47859 47913 49085https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/581/A138?format=asciidefaultJ/A+A/581/A138/tablea1Essential data for the 316 stars identified as photometrically variable chemically peculiar stars or star candidates in the present paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLitindicates available information from the literature in tableb1meta.ref.urlcharStarStar namemeta.id;meta.maincharprimaryRenson? ID number of Renson & Manfroid (2009A&A...498..961R, Cat. III/260)meta.idintnullableRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTypeType (ACV for alpha^2^ Canum Venaticorum)src.classcharVmaglLower value of V magnitude rangemagphot.mag;em.opt.VfloatVmaguUpper value of V magnitude rangemagphot.mag;em.opt.VfloatPerPerioddtime.perioddoublee_Perrms uncertainty on Perdstat.errordoubleEpochEpoch (HJD)dtime.epochdoublee_Epochrms uncertainty on Epochdstat.error;time.epochfloatSpMK Spectral typesrc.spTypecharB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatJ-KsJ-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/581/A138/tableb1Available information on single objects from the literature and miscellaneous remarksn_PerNote on Per1meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharLNameVariable designation in the literaturemeta.idcharVTypeVariable type in the literaturesrc.classcharPer1? Period in the literaturedtime.perioddoublenullableu_Per1[?] Uncertainty flag on Per1meta.code.errorcharr_Per1Refernece for Per1 (1)meta.ref;pos.framecharPer2? Period in the literaturedtime.perioddoublenullableu_Per2[:? ] Uncertainty flag on Per2meta.code.errorcharn_Per2Note on Per2meta.notecharr_Per2Reference for Per2 (1)meta.ref;pos.framecharPer? Period (this paper)dtime.perioddoublenullablee_Per? rms uncertainty on Perdstat.errordoublenullabler_PerReference for Per (1)meta.ref;pos.framecharFlag[*] Flag (2)meta.code.errorcharComRemarks/commentsmeta.notechar