J/A+A/656/A125ivo://CDS.VizieR/J/A+A/656/A125doi:10.26093/cds/vizier.36560125CDSFaltova N.Kallova N.Prisegen M.Stanek P.Supikova J.Xia C.,Bernhard K.Hummerich S.Paunzen E.2022-06-23T08:20:08Z2021-12-10T09:11:25ZCDS support team

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

cds-question@unistra.frap-starspeculiar-variable-starsvariable-starsstellar-spectral-typesmorgan-keenan-classificationThe present work presents a case study of known variables from the Zwicky Transient Facility (ZTF) survey, with the aim of investigating the survey's suitability for the detection and study of new ACV variables. Using suitable selection criteria based on the known characteristics of ACV variables, candidate ACV stars were selected from the ZTF Catalog of Periodic Variable Stars. All light curves were inspected in detail to select the most promising candidates. Where available, low-resolution spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) were employed to classify the stars on the MK system and confirm their status as mCP stars. We have identified 86 new promising ACV star candidates. 15 of these stars have LAMOST spectra available, which, in all cases, confirm them as classical mCP stars, which highlights the viability of our approach. We present astrophysical parameters for all sample stars, which can be sorted into four subgroups characterized by distinct light curve shapes. Anti-phase variations in different photometric passbands, in particular, is a unique characteristic of a subset of ACV stars readily usable for their identification. The availability of data in three different passbands (g, r, and i) is a major advantage of the ZTF survey. On the basis of our experience with other photometric surveys and the analysis of light curves, we conclude that the ZTF is well suited for the search for, and the analysis of, ACV variables, which, however, are not considered in the available ZTF variable star catalogues. Further work will be concerned with the development and refinement of a search algorithm to correctly identify these stars in ZTF data and, subsequently, in massive photometric time-series databases in general.2021A&A...656A.125Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/656/A125CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://dr7.lamost.org/ : LAMOST DR7 Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/656/A125https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/656/A125http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/656/A125https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/656/A125https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/656/A125http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/656/A125GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/656/A125/table1 (Spectral types of the 15 stars with spectra in LAMOST DR7)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/656/A125/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/656/A125/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/656/A125/table1?GETtext/xml+votable180.050000true20.43962544.60716670.0055555555555555566/1214 1340 1347 1509 1864 2825 12585 14005 14783 14966 15088 15161 23734 23783 23904https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/656/A125?format=asciiOpticaldefaultJ/A+A/656/A125/table1Spectral types of the 15 stars with spectra in LAMOST DR7recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/15] Running numbermeta.idintLAMOSTLAMOST identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharObsIDLAMOST observation IDmeta.id;obslongS/NgSloan g band S/N of analysed spectrumstat.snrintSpTypeSpectral type as derived in this studysrc.spTypecharspShow the spectrummeta.ref.urlcharFileNameLAMOST FITS spectrum FileName in subdirectory spmeta.id;meta.fitscharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from LAMOST name (right ascension part)degpos.eq.ra;meta.main_DEPositions from LAMOST name (declination part)degpos.eq.dec;meta.main