J/AN/329/418ivo://CDS.VizieR/J/AN/329/418doi:10.26093/cds/vizier.113290418CDSMihov B.M.Slavcheva-Mihova L.S.2025-09-29T20:17:38Z2008-08-05T21:44:22ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesstandard-starsinfrared-photometryvisible-astronomybroad-band-photometryWe present UBVRcIc magnitudes of 49 comparison stars in the fields of the Seyfert galaxies Mrk 335, Mrk 79, Mrk 279, Mrk 506, 3C 382, 3C 390.3, NGC 6814, Mrk 304, Ark 564, and NGC 7469 in order to facilitate the photometric monitoring of these objects; 36 of the stars have not been calibrated before. The comparison stars are situated in 5x5arcmin fields centred on the Seyfert galaxies, their V band flux ranges from 11.7 to 18.2mag with a median value of 16.3mag, and their B-V colour index ranges from 0.4 to 1.6mag with a median value of 0.8mag. The median errors of the calibrated UBVRCIC magnitudes are 0.08, 0.04, 0.03, 0.04, and 0.06mag, respectively. Comparison stars were calibrated for the first time in three of the fields (Mrk 506, 3C 382, and Mrk 304). The comparison sequences in the other fields were improved in various aspects. Extra stars were calibrated in four fields (Mrk 335, Mrk 79, NGC 6814, and NGC 7469) most of these stars are fainter and are situated closer to the Seyfert galaxies compared to the existing comparison stars. The passband coverage of the sequences in five fields (Mrk 335, Mrk 79, Mrk 279, NGC 6814, and Ark 564) was complemented with the U band.2008AN....329..418Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AN/329/418CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/other/Ap/48.304 : BVRI of comparison stars in AGN fields (Doroshenko+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AN/329/418https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AN/329/418http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AN/329/418https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AN/329/418https://vizier.iucaa.in/viz-bin/votable?-source=J/AN/329/418http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AN/329/418GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AN/329/418/table1 (List of selected Seyfert galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/329/418/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/329/418/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/329/418/table1?GETtext/xml+votable180.050000true1.581337520.202913890.005555555555555556Cone search capability for table J/AN/329/418/table2 (Apparent Johnson-Cousins UBVRcIc magnitudes of the comparison stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/329/418/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/329/418/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/329/418/table2?GETtext/xml+votable180.050000true1.5837791720.180719440.0055555555555555566/6977 11898 13414 14858 16301 19283 19433 19883 29795 32683 32686https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AN/329/418?format=asciiOpticalInfrareddefaultJ/AN/329/418/table1List of selected Seyfert galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy name (1)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.mainzRedshift (1)src.redshiftdoubleSyTypeSeyfert type (1)src.morph.typefloatNNumber of different observing nightsmeta.numbercharn? Number of nights used in the internal check for variability of the newly calibrated stars (2)meta.numberintnullableSimbadSimbad column added by the CDScharNEDSimbad column added by the CDScharONamesOther name(s) (1)meta.idcharJ/AN/329/418/table2Apparent Johnson-Cousins UBVRcIc magnitudes of the comparison starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy nameobs.fieldcharStar[A-G] Star designation (1)meta.id;meta.maincharOName1Other namemeta.idcharr_OName1Reference for OName1 (2)meta.ref;pos.framecharOName2Other namemeta.idcharr_OName2Reference for OName2 (2)meta.ref;pos.framecharOName3Other namemeta.idcharr_OName3Reference for OName3 (2)meta.ref;pos.framecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainUmag? Johnson U magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag? rms uncertainty on Umagmagstat.error;phot.mag;em.opt.Ufloatnullableo_Umag? Number of individual estimates used to obtain the final U magnitudemeta.numberintnullableBmagJohnson B magnitudemagphot.mag;em.opt.Bfloate_Bmagrms uncertainty on Bmagmagstat.error;phot.mag;em.opt.Bfloato_BmagNumber of individual estimates used to obtain the final B magnitudemeta.numberintVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloato_VmagNumber of individual estimates used to obtain the final V magnitudemeta.numberintRcmag? Cousins R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rcmag? rms uncertainty on Rcmagmagstat.error;phot.mag;em.opt.Rfloatnullableo_Rcmag? Number of individual estimates used to obtain the final Rc magnitudemeta.numberintnullableIcmag? Cousins I magnitudemagphot.mag;em.opt.Ifloatnullablee_Icmag? rms uncertainty on Icmagmagstat.error;phot.mag;em.opt.Ifloatnullableo_Icmag? Number of individual estimates used to obtain the final Ic magnitudemeta.numberintnullable