Profile parameters of the 6196{AA} DIB Virtual Observatory Resource

Authors
  1. Piecka M.
  2. Hutschenreuter S.
  3. Alves J.
  4. Published by
    CDS
Abstract

The 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.

Keywords
  1. early-type-stars
  2. interstellar-medium
  3. spectroscopy
Bibliographic source Bibcode
2025A&A...695A.205P
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A205
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/695/A205

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/695/A205
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A205
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A205
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
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?

History

2025-03-20T08:01:54Z
Resource record created
2025-03-20T08:01:54Z
Created
2025-04-01T12:52:45Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr