J/A+A/695/A205ivo://CDS.VizieR/J/A+A/695/A205doi:10.26093/cds/vizier/bc-nq/lcafCDSPiecka M.Hutschenreuter S.Alves J.2026-07-03T06:36:35Z2025-03-20T08:01:54ZCDS support team

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

cds-question@unistra.frearly-type-starsinterstellar-mediumspectroscopyThe diffuse interstellar band (DIB) at 6196{AA} exhibits notable profile variations across the Milky Way. This study addresses three open issues: the unusual broadening of the DIB profile towards Upper Sco, the lack of profile variations towards stars near eta Car, and the origin of the blueshift observed in Sco OB1. Using archival spectra of 453 early-type stars across the Galactic disk and in its proximity, we created a catalogue of the DIB's profile parameters. Our analysis identifies Doppler-split components within the DIB profiles across most regions but finds no evidence for these splits being able to account for the observed broadening (23km/s) in Upper Sco or other regions like Orion, Vela OB2, and Melotte 20 (alpha Per cluster). We propose that neither the ages of the studied stellar populations nor the distances between clusters and nearby clouds contribute significantly to the broadening. However, we detect a gradient in the FWHM within the Sco-Cen and Orion regions, where broadening decreases with distance from the star-forming centres. This result points to a possible connection between the DIB broadening and star formation (likely via the impact of recent supernovae). Regarding the Carina Nebula, we confirm the lack of DIB profile variations in a small region near eta Car, although an adjacent southern area exhibits significant variations, comparable to those in Upper Sco. In addition to the Carina Nebula, we find that the Rosette Nebula and NGC 6405 also show consistently narrow profiles (<20km/s) with minimal deviations from the median over spatial scales of a few parsecs. Finally, regarding the origin of the blueshift observed in Sco OB1, we use a comparison with the Lagoon Nebula and argue that the most natural explanation is the presence of an unresolved kinematic component in the profile of the DIB, shifting the measured centre of the band.2025A&A...695A.205Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A205CatalogResearchIsServedByTAP 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/A205https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A205http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A205https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/695/A205https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/695/A205http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/695/A205GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/695/A205/pha6196 (Observed targets and profile measurements (table B1 + B2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A205/pha6196?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A205/pha6196?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A205/pha6196?GETtext/xml+votable180.050000true267.4654244-19.90615590.0055555555555555565/9474 6/463 1196 1198 1285 1287 1293 1297 1539 1550 1558 3136 3138 3300-3301 3307 14008 14653-14655 14690 14740 15369 15652 20820 20831 21353 21428 21432 21439 21456 21528 21531 21643-21644 21646-21647 21655-21656 21671 22023 22040 22044 22243 22246 22249 22252-22253 22805 22808 22837 22854 22861-22863 22873 22911 22981 22992 22994 23358 23360 23374 23410 23442 23714 23717 23728 24325 24340 24370 28711 28729 28806 28809 28816 28825 28831 28845 28849 28852 28874 28890-28892 28894 28900 28902 28908 28913 28915-28916 29089 29092-29093 29095 29110 29113 29115-29116 29118 29154 29158-29159 29162 29174 29238 29267 29318 29322 29338 29391 29457 29460 29463 29467 29504-29505 29513 29515 29519 29522 29525 29527 29530 29537 29876 30403 30718 30722 30761 30818 31126 31259 31812 37231-37233 37245 37247 37319 37331-37333 37335 37339 37351 37353 37362 37364 37592-37593 37733 37741 37754 37841 37871 37877 37889 37894 37900-37901 37905 37912 37922-37924 37926 37928 37930-37932 37934 38016 38018-38020 38022 38024-38026 38629 39201 39252 39254 39259 39264 39267 39281-39282 39297 39374 39386 39696 39907 39916 39931 39937 41103 41134 41186 41447 41557 41566 41571 41584 41592 41595 41599 41615 41630 41651 41653 41664 41670-41671 41675 41677 41696 41698 41741 41750 41758 41769 42024 42029 42113 42116 42153 42173 42213-42214 42221 42394-42395 42405 42417 42423 42456 42458 42462 42464 42483 42486 42489 42622 42711 42791 42947-42948 42959 42977 42981 42985 42989 42994 43018-43019 43024 43033 43040 43042 43048 43056 44248 44307 44310 44312 44316 44319 44354 44357 44360 44366 44371 44378 44386 44389 45081 45105 47593 47648 47825https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/695/A205?format=asciidefaultJ/A+A/695/A205/pha6196Observed targets and profile measurements (table B1 + B2)_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget IDmeta.id;meta.maincharGroup[0/11] ID of the group assigned to the targetmeta.id;pos.lgintLabelLabel of the group assigned to the targetmeta.idcharSubgroupObject in the vicinity of the targetmeta.idcharAstroSourceSource of astrometric measurementsmeta.bibcharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latPlx? Parallaxmaspos.parallaxfloatnullablee_Plx? Parallax uncertaintymasstat.error;pos.parallaxfloatnullableSpectSourceSource of the observed spectrameta.bibcharNspectNumber of stacked spectrameta.numberintb_Wave16th percentile of profile wavelength0.1nmem.wldoubleWave50th percentile of profile wavelength0.1nmem.wldoubleB_Wave84th percentile of profile wavelength0.1nmem.wldoubleb_Depth16th percentile of central depthphys.absorption.opticalDepthfloatDepth50th percentile of central depthphys.absorption.opticalDepthfloatB_Depth84th percentile of central depthphys.absorption.opticalDepthfloatb_FWHM16th percentile of FWHMkm/sphys.angSizefloatFWHM50th percentile of FWHMkm/sspect.line.widthfloatB_FWHM84th percentile of FWHMkm/sphys.angSizefloatb_EW16th percentile of EW0.1pmspect.line.eqWidthfloatEW50th percentile of EW0.1pmspect.line.eqWidthfloatB_EW84th percentile of EW0.1pmspect.line.eqWidthfloat