J/A+A/711/A128ivo://CDS.VizieR/J/A+A/711/A128CDSPaul G.Neiner C.Catala C.Labadie-Bartz J.2026-10-10T20:03:48Z2026-07-08T07:43:54ZCDS support team

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

cds-question@unistra.frvariable-starsvisible-astronomydelta Scuti stars are pulsating stars constituting the delta Scuti instability strip in the Hertzsprung-Russell (HR) diagram, which consists of A and F stars of various evolutionary stages. They are in the transition region between high-mass hot stars and low-mass solar-like stars, making understanding their magnetic properties essential to painting a complete picture of magnetism across the HR diagram. Furthermore, discovering magnetic delta Scuti stars allows for magneto-asteroseismology, which can be used to determine the internal rotation profile, internal magnetic field strength, and the efficiency of mixing and transport processes more accurately than classical asteroseismology. To date, magnetic fields have been detected at the surface of 13 delta Scuti stars. However, the overall incidence rate of magnetism in these stars remains unknown. Fossil magnetic fields are detected in 10% of OBA stars. The goal of this work is to find out if it is the same for delta Scuti stars. We investigated the incidence rate of surface magnetic fields among delta Scuti stars using photometric data from the CoRoT space mission. We analyzed long-duration (~5 months) light curves of ~1750 delta Scuti stars to search for pulsations and rotational modulation - a photometric signature that indicates chemical or temperature spots at the stellar surface, usually caused by magnetic fields. We identified 147 rotational variables that we designate as magnetic candidates, thus potentially increasing the known population of magnetic delta Scuti stars drastically and suggesting an incidence rate of fossil magnetic fields in delta Scuti stars similar to the incidence rate in OBA stars in general. Our analysis also revealed a few delta Scuti-gamma Dor hybrid stars and four binary stars in the sample. We determined the rotation periods and projected rotation velocities of the magnetic candidates in order to select suitable targets for follow-up spectropolarimetric observations aimed at confirming and characterizing their magnetic fields.2026A&A...711A.128Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A128CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/corot : CoRoT observation log (N2-4.4) (CoRoT 2016)I/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/A+A/711/A128https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/711/A128http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/711/A128https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/711/A128https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/711/A128http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/711/A128GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/711/A128/tableb1 (Candidate magnetic delta Scuti stars among the CoRoT variable stars catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/711/A128/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/711/A128/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/711/A128/tableb1?GETtext/xml+votable180.050000true290.634036111.599151110.0055555555555555565/5510 5519 6/21461 22034 22046 22065 22067-22068 22070 22144 22164-22165 22167 22208 22210 22251 23574 23577 23580 23620 23636-23638 29557 30240 30242 30276-30277 30293 30301 30414 30436-30437 30439 30444-30445 30450 30456-30457 30460 30464 30466 30472-30473 31825-31826https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/711/A128?format=asciiOpticaldefaultJ/A+A/711/A128/tableb1Candidate magnetic delta Scuti stars among the CoRoT variable stars cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCoRoTCoRoT identifiermeta.id;meta.mainlongGaiaDR3Gaia DR3 source identifiermeta.idRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainfrotRotation frequencyd**-1em.freq;src.varfloat