Keywords :
ISM kinematics and dynamics - ISM: lines and bands - ISM: structure
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
...(more)
Abstract:
(hide)