J/A+A/699/A120ivo://CDS.VizieR/J/A+A/699/A120doi:10.26093/cds/vizier/bc-nv/lbcaCDSMarin F.2026-08-03T06:55:19Z2025-07-02T08:11:53ZCDS support team

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

cds-question@unistra.fremission-line-starspre-main-sequence-starspolarimetryultraviolet-astronomyHerbig Ae/Be stars are young, pre-main-sequence stars that provide critical insights into the processes of stellar formation, early stellar evolution and protoplanetary disks. Two of the key features of such stars are their circumstellar dusty disk and bipolar ionized outflows, which are key components for understanding planet formation processes and energy/matter deposition in the interstellar medium, respectively. In this context, imaging polarimetry is probably the sharpest tool to characterize the various structures and dynamics around the central star, due to the sensitivity of polarization to the morphology of the emitting, scattering and absorbing media. We take advantage of never published, near-ultraviolet polarimetric data of LK-Halpha-233 taken by the Faint Object Camera aboard the Hubble Space Telescope in 1991, 1994 and 1995, which remained dormant in the archives despite their quality. Using the most recent and robust reduction pipeline for this instrument, we obtained high spatial resolution (0.0287x0.0287-arcsecond^2^) maps of this object at 4118{AA}, together with polarimetric measurements. A dark lane, bisecting the approaching and receding polar outflows, suggests the presence of a circumstellar disk or dust torus, obscuring the pre-main sequence star and collimating the ejecta. Polarization reveals that the outflows have an X-shape structure with a significant centro-symmetric pattern in polarization angle, indicating that the outflows are both hollow and scattering the emission from the buried star. We constrain the half-opening angle of both the outflows and circumstellar disk, determine the inclination of the system and estimate the obscured star's intrinsic flux. This study highlights the importance of high-resolution polarimetric observations in understanding the complex environment around Herbig Ae/Be stars and advocates for future similar instruments.2025A&A...699A.120Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/699/A120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/699/A120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/699/A120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/699/A120https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/699/A120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/699/A120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/699/A120/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/699/A120/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/699/A120/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/699/A120/list?GETtext/xml+votable180.050000true338.6707840.66840.0055555555555555566/13736https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/699/A120?format=asciiUVdefaultJ/A+A/699/A120/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation date'Y:M:D'time.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar