J/A+A/695/A74ivo://CDS.VizieR/J/A+A/695/A74CDSAnania R.Winter A.J.Rosotti G.Vioque M.Zari E.,Pantaleoni Gonzalez M.Testi L.2026-01-23T19:04:57Z2025-03-11T09:27:38ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsultraviolet-astronomyWhen protoplanetary discs are externally irradiated by far-ultraviolet (FUV) photons from OBA-type stars, they lose material through photoevaporative winds. This reduces the amount of material that is available to form planets. Understanding the link between the environmental irradiation and the observed disc properties requires accurately evaluating the FUV flux at disc-hosting stars, which can be challenging because of the uncertainty in stellar parallax. We addressed this issue by proposing a novel approach: using the local density distribution of a star-forming region (i.e. 2D pairwise star separation distribution) and assuming isotropy, we inferred the 3D separation between disc-hosting stars and massive stars. We tested this approach on synthetic clusters and showed that it significantly improves accuracy compared to previous methods. We computed the FUV fluxes for numerous star-bearing discs in seven regions within ~200pc, six regions in Orion and in Serpens sub-regions. We provided a publicly accessible catalogue. We found that discs in regions hosting late-type B and early-type A stars can reach non-negligible FUV radiation levels for the disc evolution (10-100G0). We investigated dust disc masses relative to FUV fluxes and detected indications of a negative correlation when we restricted the investigation to average region ages. However, we emphasize the need for more stellar and disc observations at >10^2G_0_ to probe the dependence of disc properties on environmental irradiation. The method presented in this work is a powerful tool that can be expanded to additional regions.2025A&A...695A..74Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/695/A74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/695/A74https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/695/A74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/695/A74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/695/A74/tableb1 (FUV flux at the position of the considered discs in 14 nearby star-forming regions (updated version, 23-Jan-2026))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A74/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A74/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A74/tableb1?GETtext/xml+votable180.050000true241.8644958333333-20.99561305555560.0055555555555555565/270 292 7590 9239 10283 10745 11079 11090-11091 11094 6/342 1029-1031 1037 1039-1040 1042-1043 1047-1048 1050-1054 1061 1063 1068 1073-1075 1078 1084 1111 1113-1115 1123-1124 1126 1136 1156-1157 1159 1176 21438-21439 22805 22851 22854-22855 22894-22895 22906 22980-22981 22992 23517 23548-23549 23551 23717 23719 23728 24198 24201 24203 24294-24295 24300 26192 29658-29659 30251 30254-30255 30337 30340-30341 30343 30352 30356 30358-30359 30366 36946 36949 37122 37128-37129 41126-41127 42595 42597-42599 42605 42610-42611 42614-42615 42704-42705 42707 42713-42714 42727 42736-42738 42903 42932 42943 42957 42959 42967 42969-42972 42976 42979 42984-42986 42989-42990 42992 42994 43000-43001 44118 44307 44310-44311 44343 44352-44353 44355-44356 44358 44368-44369 44371 44374 44386 44389 44397 44400-44401 44404 47739 47742 47825 47827-47828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/695/A74?format=asciiUVdefaultJ/A+A/695/A74/tableb1FUV flux at the position of the considered discs in 14 nearby star-forming regions (updated version, 23-Jan-2026)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTable[0/1919] Source numbermeta.id;meta.datasetintRegionRegion of the sourceobs.fieldcharNameName of the source (JHHMMSSss+DDMMSSs)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainFFUV50% of the far-ultraviolet flux distribution (in Habing unit, G_0_) (1)phot.flux;em.UVdoubleb_FFUV? 16% of the far-ultraviolet flux distribution (in Habing unit, G_0_) (1)phot.fluxdoublenullableB_FFUV? 84% of the far-ultraviolet flux distribution (in Habing unit, G_0_) (1)phot.fluxdoublenullable