J/AJ/167/42ivo://CDS.VizieR/J/AJ/167/42doi:10.26093/cds/vizier.51670042CDSNgeow C.-C.Bhardwaj A.2024-11-06T20:20:28Z2024-05-13T09:44:04ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomyphotometryMultiband light curves of two RR-Lyrae variables in SegueII and Ursa-MajorII ultrafaint dwarf galaxies were collected from near simultaneous observations using the Lulin One-meter Telescope in Vgri bands. Together with Gaia G-band light curves, we determined photometric metallicities using empirical relations involving pulsation period and Fourier parameter as dependent parameters. We demonstrated that the RR-Lyrae photometric metallicity can be determined accurately when these empirical relations were employed at multiple wavelengths, which can potentially improve the distance determination based on RR-Lyrae stars. The photometric metallicities based on our approach were found to be -2.27{+/-}0.13dex and -1.87{+/-}0.16dex for the RR-Lyrae in SegueII and Ursa-MajorII UFD, respectively, with corresponding distance moduli of 17.69{+/-}0.15 mag and 17.58{+/-}0.15 mag, in agreement with previous literature determinations. This approach of photometric metallicity of RR Lyrae based on multiband optical light curves will be particularly relevant for distance measurements in the era of the Vera C Rubin's Legacy Survey of Space and Time.2024AJ....167...42Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/42CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/A+A/312/111 : [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)J/MNRAS/397/1748 : Spectroscopic study of Segue 2 (Belokurov+, 2009)J/MNRAS/415/1366 : OGLE RR Lyrae in SMC (Kapakos+, 2011)J/ApJ/752/42 : BV time series in Ursa Major II (Dall'Ora+, 2012)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/A+A/590/A9 : RGB stars in Galactic GC stellar parameters (Dias+, 2016)J/ApJ/908/20 : On use of RR Lyrae as galactic probes. II. (Crestani+, 2021)J/ApJ/920/33 : Fe/H estim 104 RR Lyrae from I- light curve (Dekany+, 2021)J/ApJ/912/144 : Metal of Gal. RR Lyrae from opt. & IR LCs (Mullen+, 2021)J/AJ/164/45 : grV light curve 30 RR-Lyrae into Kepler field (Ngeow, 2022)J/A+A/674/A18 : Gaia DR3. The RR Lyrae sample (Clementini+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/42https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/167/42/table1Light curves for SEGUE II-V1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of observationdtime.epochdoublemagMagnitude in Filtermagphot.mag;em.optfloate_magError in magmagstat.error;phot.magfloatFiltFilter usedinstr.setup;instr.filtercharJ/AJ/167/42/table2Light curves for UMaII-V1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of observationdtime.epochdoublemagMagnitude in Filtermagphot.mag;em.optfloate_magError in magmagstat.error;phot.magfloatFiltFilter usedinstr.setup;instr.filterchar