J/other/NatAs/7.ivo://CDS.VizieR/J/other/NatAs/7.1081doi:10.26093/cds/vizier/dt/hkbaibCDSChen X.Zhang J.Wang S.Deng L.2026-03-04T20:03:30Z2024-07-25T13:39:57ZCDS support team

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

cds-question@unistra.frvariable-starsorbitsvisible-astronomyRR Lyrae stars are one of the primary distance indicators for old stellar populations such as globular clusters, dwarf galaxies and galaxies. Typically, fundamental-mode RR Lyr stars are used for distance measurements, and their accuracy is strongly limited by the dependence of absolute magnitudes on metallicity, in both the optical and infrared bands. Here, we report the discovery of a period-(period ratio)-metallicity relation for double-mode RR Lyr stars, which can predict metallicity as accurately as the low-resolution spectra. With theoretical and observational evidence, we propose that the period-luminosity relation of double-mode RR Lyr stars is not affected by the metallicity. Combining the Large Magellanic Cloud distance and Gaia parallaxes, we calibrate the zero point of the period-luminosity relation to an error of 0.022mag, which means that in the best case double-mode RR Lyr stars can anchor galaxy distances to an accuracy of 1.0%. For four globular clusters and two dwarf galaxies, we obtain distances using double-mode RR Lyr stars with a distance accuracy of 2-3% and 1-2%, respectively. With future telescopes such as the China Space Station Telescope and the Vera C. Rubin Observatory, double-mode RR Lyr stars will be established as an independent distance ladder in the near-field universe.2023NatAs...7.1081Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NatAs/7.1081CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NatAs/7.1081https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NatAs/7.1081http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NatAs/7.1081https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NatAs/7.1081https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NatAs/7.1081http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NatAs/7.1081GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/NatAs/7.1081/tables1 (The full data set of the RRd used to determine the period-period ratio-metallicity relation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/NatAs/7.1081/tables1?https://vizier.iucaa.in/viz-bin/conesearch/J/other/NatAs/7.1081/tables1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/NatAs/7.1081/tables1?GETtext/xml+votable180.050000true215.8769719.42570.005555555555555556Cone search capability for table J/other/NatAs/7.1081/tables2 (The full data set of the RRd used to determine the offset of Gaia parallax)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/NatAs/7.1081/tables2?https://vizier.iucaa.in/viz-bin/conesearch/J/other/NatAs/7.1081/tables2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/NatAs/7.1081/tables2?GETtext/xml+votable180.050000true10.4885334.341820.0055555555555555566/68 363 437 1549 2334 2574 2609 2688 2832 3091 3575 4138 4154 4164 4212 4252 4329 4337 4349 4403 4432 4451 4509 4707 4767 4826 4835 4859 4905 4981 4992 5100 5104 5143 5265 5271 5292 5295 5298 5384 5413 5439 5508 5510 5513 5519 5545 5554 5573 5579 5633 5639 5666 5678 5682 5691 5719 5743 5749 5754 5782 5847 5867 5894 5911 6076 6186 6235 6411 6429 6484 7170 7202 7280 7417 7433 7561 8217 8226 8253 8314 8341 8391 8532-8533 8579 8717 8746 8809 8836 8897 8931 8939 8943 9008 9080 9145 9163 9186 9211 9237 9293 9355 9384 9408 9414 9446 9448 9490 9597 9616 9626 9636 9671 9686 9691 9705 9738 9811 9814 9828 9914 9931 9975 10084 10094 10249 10264 10278 10293 10296 10376 10383 10475 10497 10514 10580 10661 10693 10729 10862 10934 10957 11048 11106 11145 11286 11416 11452 11476 11499 11642 11781 11817 11903 12017 12402 12405 12549 12658 12818 12822 12842 12899 13018 13520 13892 14512 14820 14824 15161 15184 16299 17252 17259 17368 17664-17665 17755 17822 17837 17848 18122 18254 18382 18610 18779 18982 19095 19118 19467 19755 19890 20153-20154 20271 20287 20453 20476 20770 21781 21831 21886 21965 22476 22526 22897 23060 23174 23213 23293 23319 24026 24220 24738 24875 24966 25417 25504 25597 25731 25855 25977 25996 26048 26089 26142 26195 26280 26288 26317 26397 26405 26407 26416 26418 26458 26461 26515 26537 26543 26546 26559 26565 26598 26615 26618-26619 26954 26966 26975 27052 27115 27466 27491 27503 27516 27615 27637 27640 27648 27703 27812 27822 27825 27869 27888 27915 27918 27937 27953 27956 27970 27978-27979 28045 28086 28161 28214 28232 28331 28341 28362 28367 28386 28399 28492 28494 28568 28595 28611 28618 28620 28631 29330 29842 30029 30464 30556 30760 30796 30995 31079 31355 31357 31374 31381 31413 31423 31511 31540 31676 31706 31730 31923 31939 31957 32231 32295 32346 32404 32436 32443 32603 32696 32703 33580 34223 34322 34713 34804 35419 35944 37022 37455 38062 38323 38604 38617 39287 39539 39663 39863 40151 40303 40942 43060 43324 44295 44366 44445 44566 44810 45023 45492 45705 45761 46061 46127 46233 46336 46575 46632 46814 47027 47054 47371 48194 48539 48549 48771 48795 48888 49012 49036 49123 49133 49138https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/NatAs/7.1081?format=asciiOpticaldefaultJ/other/NatAs/7.1081/tables1The full data set of the RRd used to determine the period-period ratio-metallicity relationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainP1O/PFPeriod ratiometa.notedoubleP1OFirst overtone perioddtime.perioddoublePFFundamental perioddtime.perioddouble[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]Metallicity errorstat.error;phys.abund.Fefloatr_[Fe/H]Reference survey for [Fe/H] (SDSS or LAMOST)meta.refcharJ/other/NatAs/7.1081/tables2The full data set of the RRd used to determine the offset of Gaia parallaxrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainWGBPRPmagWesenheit magnitude (W_G,BP,RP_=G-1.90(BP-RP))magphot.mag;em.optfloatP1OFirst overtone perioddtime.perioddoublePFFundamental perioddtime.perioddoubleplxcorrGaia DR3 corrected parallaxmaspos.parallax.trigfloatplxGaia DR3 parallaxmaspos.parallax.trigfloate_plxGaia DR3 parallax errormasstat.error;pos.parallaxfloat[Fe/H]calCalculated metallicityphys.abund.Fefloat