J/A+A/713/A56ivo://CDS.VizieR/J/A+A/713/A56CDSBadolo N.A.Lagadec E.N'Diaye M.Kam S.Z.McDonald I.Matter A.,Koulidiati J.Abe L.Carbillet M.Fusco T.2026-09-07T07:32:35Z2026-09-07T08:32:10ZCDS support team

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

cds-question@unistra.frgiant-starspolarimetryinterstellar-mediumvisible-astronomyinfrared-astronomyobservational-astronomyWe present the largest catalogue of asymptotic giant branch (AGB) stars, 45 targets in total, observed in polarized light at high angular resolution (~20 milliarcsec). The main goal of the study is to detect and characterize dust shells in the close environment of nearby AGB stars. This work also aims to systematically classify the AGB star circumstellar morphologies obtained with the SPHERE instrument installed at the Very Large Telescope (VLT), thanks to its Zurich Imaging Polarimeter (ZIMPOL). We extracted and analyzed polarized intensity maps for 45 AGB stars, constructed from polarimetric observation data obtained with the SPHERE/ZIMPOL instrument. An ellipse fitting method was applied to characterize the circumstellar envelopes. Stellar parameters (luminosity, effective temperature, surface gravity, extinction, metallicity) were compiled and recalculated when necessary from spectral energy distribution (SED) fitting using the Python SED fitting tool (PySSED) software. These data were then used to train a random forest machine learning model to determine the most discriminating variables for a resolved envelope around a given star. We constructed polarization maps for all stars in the sample, revealing a wide diversity of circumstellar morphologies. We detected 16 dusty circumstellar envelopes, including three never observed before. They display a wide range of morphologies, all of them showing a clear departure from spherical symmetry, indicating interaction with a companion or asymmetric mass ejections. The random forest model identified optimal thresholds for several physical parameters, thus providing robust criteria to anticipate SPHERE's ability to resolve dust envelopes around AGB stars. These results facilitate the selection of targets for future observations and contribute to a better understanding of the evolution mechanisms of circumstellar envelopes.2026A&A...713A..56Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A56CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/713/A56https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/713/A56http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/713/A56https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/713/A56https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/713/A56http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/713/A56GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/713/A56/list (List of fits images of high angular resolution polarimetric observations of 45 nearby AGB stars obtained with SPHERE/ZIMPOL at the VLT)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A56/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A56/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A56/list?GETtext/xml+votable180.050000true91.24637-16.484430.0055555555555555566/4306 4355 8532 12882 14457 16783 16812 17314 17716 18634 19293 20212 20272 20699 21241 21255 25228 25246 26180 26327 26345 29817 29877 30606 32271 33233 33739 34158 35118 35641 36498 36655 39504 40566 43890 44018 45075 45279 45809 46318 46321 46932 46938 48301 48650https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/713/A56?format=asciiOpticalInfrareddefaultJ/A+A/713/A56/listList of fits images of high angular resolution polarimetric observations of 45 nearby AGB stars obtained with SPHERE/ZIMPOL at the VLTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (Name)meta.id;meta.maincharRAJ2000Right Ascension of center (J2000) (RAdeg)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000) (DEdeg)degpos.eq.dec;meta.mainscaleScale of the image (scale)arcsec/pixinstr.scalefloatNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of pixels along Z-axismeta.numberintObsThe observing date (DATE-OBS)time.epochsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharSimbadNameSimbad column added by the CDSmeta.idcharnullable