J/A+A/710/A16ivo://CDS.VizieR/J/A+A/710/A16CDSDuchene N.Girard J.N.Zarka P.2026-05-28T08:10:32Z2026-05-28T08:58:11ZCDS support team

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

cds-question@unistra.frmagnetic-fieldsastronomical-reference-materialsDuring the last two decades, thousands of stellar magnetic fields have been measured using the Zeeman-Doppler imaging method. No unified database gathers all measurements in an homogeneous way. The magnetic field of a star is a key ingredient of its plasma interactions with companions, either other stars or exoplanets, and of its radio and X-ray emissions. The dipolar component of a star's magnetic field, in particular, allows one to estimate the magnetic (Poynting) flux carried away by the stellar wind, that sweeps across exoplanets or their magnetospheres and is believed to drive electron acceleration and radio emissions. Here we aim at building a database of known stellar magnetic fields, inferring the dipolar component of the field, and we present the methods that we have developed to estimate a star's magnetic field when no measurement is available. We have compiled published Zeeman-Doppler measurements of stellar magnetic fields into a database, showing how to extract the dipolar component from various measurements. We have included several other stellar parameters in the database (mass, radius, rotation period, effective temperature, age, V-band magnitude). Then we have built and compared two extrapolation methods to infer stellar magnetic fields from the other stellar parameters: a K-Nearest Neighbors method and a neural network trained on the database. We present a database of over 2600 stars with an estimate of their dipolar magnetic field, and methods to predict such a parameter for other stars where it is not measured, to much better than an order of magnitude.2026A&A...710A..16Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A16CatalogResearchIsServedByTAP 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/A16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A16https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/710/A16/table (Estimation of equatorial dipolar magnetic field of our stars and literature references (table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/A16/table?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/A16/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/A16/table?GETtext/xml+votable180.050000true126.145875-3.75122220.0055555555555555565/292 5359 5701 5712 5714 5723 6/22 60 100 129 137 261 263 273 309 311 319 322 336 341-342 351 373 377 389 399 455-456 461-463 472 475 481 489 496-497 579 582 666 679 684 689 719 737 798 814 819 842 845 915 934 940 962 980 1029 1032-1033 1048 1050 1073-1074 1077 1113-1114 1125 1143 1159 1164 1196 1210 1287 1292-1293 1299 1302 1313 1323 1332 1357 1359 1387 1397 1430 1469 1504 1521 1530 1539 1545 1558 1562 1591 1608 1633 1637 1672 1700 1704 1762-1763 1768 1790 1793 1822 1848 1875 1877 1890 1938 1983 2072 2133 2152 2282 2366 2395 2409 2411 2425 2433 2436 2460 2472 2490-2491 2513 2515 2527 2545 2622-2623 2664 2677 2682 2691 2723 2737 2746 2768 2806 2817-2818 2821 2903 2953 2970 2973 2978 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39162-39163 39177 39192-39193 39202 39204 39217 39228 39243 39251 39254-39255 39263 39290 39311 39327-39328 39352 39354-39355 39371-39372 39374 39515 39532 39576 39715-39716 39720 39735 39770 39775 39793 39820 39826 39832 39853 39863 39869 39877 39893 39899 39905 39916 39922 39937 40023 40068 40070 40101 40195 40197 40242 40250 40313 40356 40359 40386 40413 40435-40436 40442 40449 40505 40513 40617 40623 40692 40696 40739 40783-40784 40806 40882 40892 40932 40941 40943-40944 41017-41018 41088 41103 41108 41144 41154 41168 41181 41210 41287 41320 41376 41439 41444 41447 41461 41472 41497 41516 41524 41552 41557 41562 41565 41568 41570 41591 41655 41666 41673 41675 41697 41731-41732 41734 41747 41750 41787 41863 41875 41911 41924 41983 42024 42029 42035 42040 42071 42074 42080 42191 42203 42212-42214 42227 42234 42236 42243 42270 42273 42290 42303 42312 42325 42343 42356-42357 42366 42394 42396 42407-42408 42416-42417 42421 42429 42458 42463-42464 42470-42471 42479 42483 42555 42568 42586 42589 42601 42610-42611 42617 42619 42633 42640 42644 42652 42658 42670 42673 42678 42684 42691 42704 42714 42728 42740 42757 42760 42829 42887 42903 42931-42932 42934 42944 42948-42949 42956 42959 42967 42970 42972 42977 42979 42981 42984 42987-42988 42994 43004 43017 43024 43030 43033 43035 43042 43062 43127 43140 43157 43187 43201 43270 43279 43285 43294 43301 43307 43310 43332 43365 43407 43420 43460 43531 43677 43704 43720 43798 43809 43813 43843 43884 44043 44049 44061 44066 44074 44119 44136 44179 44226 44243 44258 44284 44293 44306-44307 44310 44312-44313 44316-44317 44352 44354 44360 44362 44366 44371 44378-44379 44385-44386 44389 44393 44438-44439 44451 44464 44468 44518 44616 44651 44696 44707 44785 44825 44833 44844 44853 44879-44880 44892 44921 44936-44937 44967 45032 45081 45097 45110 45132 45165 45175 45203 45246 45430 45455 45539 45573 45589 45746 45921 45962 46008 46069 46081 46084 46091 46096 46118 46131 46281 46436 46459 46470 46598 46612 46637 46768 46776 46835 46856 46925 46938 46982 47090 47100 47205 47304 47342 47349 47376 47539 47574 47626 47672 47742 47807 47824 47828 47845 47855 47957 47977 47985 48061 48072 48088 48105 48146 48203 48218 48274 48455 48459 48485 48500 48516 48562 48582 48589 48652 48728 48755 48769 48781 48801 48896 48905-48906 48911 48935 48958 48993 49036 49047 49085 49101https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/A16?format=asciidefaultJ/A+A/710/A16/tableEstimation of equatorial dipolar magnetic field of our stars and literature references (table 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameMain ID of the star on SIMBAD (Simbad_ID)meta.id;meta.maincharQQuality indicator of the literature values (Qn+)meta.code.qualfloatFlagFlag for descriptors of value types (Tag) (1)meta.code.errorcharBEquatorial dipolar magnetic field estimate (Bdipeq)Gphys.magFielddoubleo_BNumber of values from the literature used to obtain this estimate (N_est)meta.numberintf_BWhether the estimate is a lower 2167 times or upper 429 times limit or a direct estimate 76 (T_est)meta.codecharNoteType of information available in the literature as described y their respective source articles (Comment) (2)meta.notecharr_NoteBibcodes of the respective source articles, in refs.dat file (Bibcodes)meta.ref;pos.framecharn_NoteDOI of the respective source articles, in dois.dat (DOI)meta.notecharSimbadNameSimbad column added by the CDSmeta.idcharnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/A+A/710/A16/refsLiterature references of the sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintBibCodeADS/Simbad bibcodemeta.bib.bibcodecharDOIDOImeta.bibcharAuthorFirst author's namemeta.bib.authorcharTitleReference titlemeta.ref;pos.framecharn_RefReference publication items as journal abbrev, volume, pages and yearmeta.notecharCatReference VizieR catalogmeta.id;meta.datasetcharJ/A+A/710/A16/doisLiterature DOI of the sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintDOIDOImeta.bibchar