J/A+A/710/A187ivo://CDS.VizieR/J/A+A/710/A187CDSWielgorski P.Pietrzynski G.Gieren W.Zgirski B.Narloch W.Hajdu G.,Storm J.Nardetto N.Kervella P.Pilecki B.Gorski M.Smolec R.,Salinas R.Graczyk D.Hocde V.Karczmarek P.Taormina M.Pych W.,Netzel H.Chini R.Hodapp K.Kaluszynski M.Pozo Nunez F.Kotysz K.,Mozdzierski D.Mikolajczyk P.Kolaczek-Szymanski P.2026-06-12T12:20:56Z2026-06-12T13:10:34ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomyradial-velocityAnomalous Cepheids are radially pulsating stars observed in dwarf galaxies, the Galactic bulge and halo, and globular clusters. Similarly to other radially pulsating stars, they can be used as distance indicators through their Period-Luminosity Relations (PLRs) and the geometrical Baade-Wesselink (BW) method. We aim to calibrate the zero-point of the distance scale of Anomalous Cepheids using nearby representatives of this class of pulsating stars. We collected optical and near-infrared photometry and spectra for a sample of nearby Anomalous Cepheids with two telescopes located at the Rolf Chini Cerro Murphy Observatory (former Observatory Cerro Armazones) and optical telescopes offered by the Las Cumbres Observatory, and with instruments hosted and operated by the European Southern Observatory. Using parallaxes measured by the Gaia space mission and mean magnitudes from our new photometry, we calibrate the zero-point of the PLRs in Johnson B, V, 2MASS J, H, Ks, and Pan-STARRS g, r, i passbands and selected Wesenheit indices. Slopes are adopted from the PLRs of the Large Magellanic Cloud Anomalous Cepheids from the literature. Using the surface brightness-colour relation version of the BW technique, we also determined the projection factors and mean radii of three nearby Anomalous Cepheids. Precision of the measured zero-points is at the level of 0.04-0.05mag and their systematic uncertainty is estimated to about 0.1mag. We used our zero-points and literature photometry of the Large Magellanic Cloud Anomalous Cepheids to measure the distance modulus of this galaxy and obtained a value of 18.454+/-0.045(statistical) mag, in a very good agreement with the most accurate value from eclipsing binaries. The obtained projection factors are 1.38+/-0.13, 1.59+/-0.21 and 1.35+/-0.14 for V716 Oph, XX Vir and UY Eri, respectively. We suspect that the very high projection factor of XX Vir is the result of the underestimated parallax of this star in the Gaia catalogue as its radius and absolute brightness are also higher than expected for Anomalous Cepheids at this period. The radii measured for V716 Oph and UY Eri are in agreement with the period-radius relation obtained from the Large Magellanic Cloud Anomalous Cepheids.2026A&A...710A.187Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A187CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/A187https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A187http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A187https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A187https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A187http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A187GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/710/A187/stars (stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/A187/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/A187/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/A187/stars?GETtext/xml+votable180.050000true229.1187516.44433330.0055555555555555566/8584 18670 25869 30927 31979 36535 36705 39475https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/A187?format=asciiOpticalInfrareddefaultJ/A+A/710/A187/starsstarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000)pos.eq.dec;meta.mainLCShow the light curvesmeta.ref.urlcharfRV[+] + indicates RV data in table4.datmeta.codecharVCShow the Radial Velocity curvesmeta.ref.urlcharJ/A+A/710/A187/table1Photometry of 8 Milky Way anomalous CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharFilterPhotometric passband (1)instr.bandpasscharHJDHeliocentric Julian Datedtime.epochdoublemagMagnitude in filtermagphot.magfloate_magUncertainty of magnitudemagstat.error;phot.magfloatJ/A+A/710/A187/table4Radial velocity measurements of 3 Milky Way anomalous CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVUncertainty of radial velocitykm/sstat.errorfloatInstInstrument used to obtain the spectrum, CORALIE, FEROS, HARPS and UVESinstr.setupchar