J/A+A/672/A165ivo://CDS.VizieR/J/A+A/672/A165doi:10.26093/cds/vizier.36720165CDSMerchan-Benitez P.Uttenthaler S.Jurado-Vargas M.2025-04-07T20:03:58Z2023-04-19T08:37:16ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometrySome Miras --- long-period variables in late evolutionary stages --- have meandering pulsation periods and light-curve asymmetries, the causes of which are still unclear. We aim to better understand the origin of meandering periods and light-curve asymmetries by investigating a sample of Miras in the solar neighbourhood. We characterised this group of stars and related their variability characteristics to other stellar parameters. We analysed observations from several databases to obtain light curves with maximum time span and temporal coverage for a sample of 548 Miras. We determined their pulsation-period evolution over a time span of many decades, searched for changes in the periods, and determined the amplitude of the period change. We also analysed the Fourier spectra with respect to possible secondary frequency maxima. The sample was divided into two groups with respect to the presence of light-curve asymmetries (`bumps'). Infrared colours and indicators of the third dredge-up were collected to study the mass loss and deep mixing properties of the stars of our sample. Our analysis reveals one new star, T Lyn, with a continuously changing period. The group of Miras with meandering period changes is exclusively made up of M-type stars. The Fourier spectra of the meandering-period Miras have no prominent additional peaks, suggesting that additional pulsation modes are not the cause of the meandering periods. We confirm that light-curve bumps are more common among S and C Miras and show, for the first time, that Miras with such bumps have lower mass-loss rates than those with regular, symmetric light curves. Also, Miras with meandering period changes have relatively little mass loss. We conclude that Miras with strongly changing periods (including meandering periods) or asymmetries in their light curves have relatively low dust mass-loss rates. Meandering period changes and light-curve asymmetries could be connected to He-shell flashes and third dredge-up episodes.2023A&A...672A.165Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/672/A165CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/328 : AllWISE Data Release (Cutri+ 2013)II/363 : The band-merged unWISE Catalog (Schlafly+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/672/A165https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/672/A165http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/672/A165https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/672/A165https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/672/A165http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/672/A165GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/672/A165/tableb1 (Data of pulsation period, deltaP/<P>, bumps, technetium content, carbon isotope ratios (^12^C/^13^C) pulsation properties, and IR photometry of stars (corrected version, 07-Apr-2025))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/672/A165/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/672/A165/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/672/A165/tableb1?GETtext/xml+votable180.050000true350.298330850.00334690.0055555555555555566/220 328 544 592 752 889 958 1285 1308 1318 1345 1350 1519 1543 1577 1716 1844 1892 1986 2016 2464 2500 2566 2578 2586 2642 2649 2687 2694 2773 2787 2795 2809 2833 2888 2936 2990 2994 3026 3209 3432 3444 3558 3584 3597 3801 3952 4024 4041 4043 4107 4286 4355 4472 4544 4614 4623 4632 4663 4687 4766 4798 4814 4892 5446 5647 5651 6161 6190 6314 6399 6407 6419 6451 6461 6720 6736 6823 6845 6851 6863 6885 6904 7105 7116 7119 7300 7619 7840 7919 7922 7929 8035 8065 8405 8475 8526 8532 8550 8737 9074 9091 9175 9258 9310 9379 9460 9755 9783 9796 10069 10103 10363 10576 10635 10806 11214 11227 11428 11712 11823 11866 11940 11997 12260 12329 12470 12475 12496 12499 12501 12510 12539 12556 12564 12676 12784 12800 12814 12833 12868 12871 12875 12888-12889 12994 13080 13160 13187 13207 13338 13463 13500 13566 13623 13666 13676 13723 13740 13813 13823 13845 13891 14019 14042 14103 14148 14175 14196 14308 14397 14410 14434 14457 14476 14490 14519 14543 14575 14592 14605 14641 14659-14660 14809 14827 14834-14835 14843 14863 14868 14920 14936 14964 14988 15012 15044 15068 15140 15144 15168 15170 15191 15359 15401 15514 15877 15892 15940 15982 16023 16042 16105 16132 16144 16157 16233 16274 16335 16389 16459 17048 17178 17242 17344 17763 17996 18188 18323 18379 19080 19120 19165 19293 19388 19434 19621 19624 19692 19830 19950 20110 20212 20272 20291 20315 20321 20477 20626 20636 20826 21050 21224 21710 21744 21803 21939 22110 22156 22161 22333 22369 22400 22407 22415 22447-22448 22470 22497 22507 22806 22972 22988 23011 23182 23367 23394 23488 23544 23691 23789 23796 23932 24151 24204 24461 24500 24520 24572 24989 24997 25407 25553 25729 25798 25842 25899 26070 26156 26319 26331 26360 26889 27048 27111 27519 27847 28072 28711 28713 28999 29017 29019-29020 29045 29349 29387 29406 29434 29793 29812 29832 29854 29877 29964 30087 30143 30194 30207 30300 30473 30554 30572 30574 30606 30661 30733 30777 30922 31108 31187 31352 31542 31552 31610 31664 31705 31758 31764 31812 31817 31828 31909 31938 32074 32080 32162 32206 32234 32237 32314 32341 32353 32372 32384 32404 32437 32455 32505 32544 32591 32621-32622 32733 32784 33140 33221 33287 33664 33739-33740 33919-33920 34094 34292 34356 34576 34792 34830 34894 35378 35511 35738 36120 36124 36188 36320 36369 36738 37023 37176 37279-37280 37302 37307 37327 37361 37395 37400 37528 37675 37719 37747 37921 37952 38051 38230 38701 38770 38821 39303 39332 39371 39409 39435 39487 39631 39933 40094 40152 40240 40337 40422 40686 40688 40855 40958 41001 41115 41314 41687 41704 41791 41811 41965 42000 42244 42318 42377 42467 42483 42530 42667 42713 42991 43046 43055 43060 43088 43150 43160 43162 43285 43454 43494 44018 44138 44317 44348 44350 44361 44364 44396 44417 44431 44433 44450-44451 44459 44498 44515 44546 44632 44657 44786 45009 45061 45088 45105 45375 45524 45528 45591 45783 45917 45936 45973 45997 46029 46081 46313 46337 46353 46388 46642 46768 46810 46859 46913 47004 47032 47098 47113 47312 47387 47394 47469 47513 47558 47819 47963 48016 48108 48218 48305 48326 48347 48464 48575 48697 48715 48869 48882 48912 48931 49123 49129 49132https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/672/A165?format=asciiInfrareddefaultJ/A+A/672/A165/tableb1Data of pulsation period, deltaP/<P>, bumps, technetium content, carbon isotope ratios (^12^C/^13^C) pulsation properties, and IR photometry of stars (corrected version, 07-Apr-2025)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGCVSObject namemeta.id;meta.maincharSpTypeSpectral typesrc.spTypecharPeriodPeriod calculated with VStar 2.21.3dtime.period;meta.modelledfloatDP/<P>Full amplitude of period variations, DeltaP/<P>%src.var.amplitude;arith.ratiofloatBumps[0/1] Asymmetry in light curves (1)meta.codeintTcTc content (2)meta.codecharr_Tc[a-d] Reference(s) of Tc content (3)meta.ref;pos.framechar12C/13C? ^12^C/^13^C contentphys.abundintnullablee_12C/13C? Uncertainty of the ^12^C/^13^C contentstat.errorintnullabler_12C/13C[1/7]? Reference of ^12^C/^13^C content (4)meta.ref;pos.frameintnullableK-[22]Mean K-[22] colourmagphot.color;em.IR;em.IRfloat[3.4]-[22]Mean [3.4]-[22] colourmagphot.color;em.IR;em.IRfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main