Abstract
We present high resolution (R∼4 km s−1) absorption measurements of the interstellar NaI and CaII lines measured towards 14 early-type stars of distance 123 pc–1650 pc, located in the direction of the Ara OB1 stellar cluster. The line profiles can broadly be split into four distinct groupings of absorption component velocity, and we have attempted to identify an origin and distance to each of these interstellar features. For gas with absorption covering the velocity range −10 km s−1 < Vhelio<+10 km s−1, we can identify the absorbing medium with local gas belonging to the Lupus-Norma interstellar cavity located between 100 and 485 pc in this galactic direction. Gas with velocities spanning the range −20 km s−1<Vhelio<+20 km s−1 is detected towards stars with distances of 570–800 pc. We identify a wide-spread interstellar feature at Vhelio∼−15 km s−1 with the expanding HI shell called GSH 337+00–05, which is now placed at a distance of ∼530 pc.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
