> astro-ph > arXiv:1508.07193
Astrophysics > Astrophysics of Galaxies
arXiv:1508.07193 (astro-ph)
[Submitted on 28 Aug 2015 (v1), last revised 24 Sep 2015 (this version, v2)]
Title:The little-studied cluster Berkeley 90. II. The foreground ISM
Authors:J. Maíz Apellániz, R. H. Barbá, A. Sota, S. Simón-Díaz
Abstract: Context: Nearly one century after their discovery, the carrier(s) of Diffuse Interstellar Bands is/are still unknown and there are few sightlines studied in detail for a large number of DIBs. Aims: We want to study the ISM sightlines towards LS III +46 11 and LS III +46 12, two early-O-type stellar systems, and LS III +46 11 B, a mid-B-type star. The three targets are located in the stellar cluster Berkeley 90 and have a high extinction. Methods: We use the multi-epoch high-S/N optical spectra presented in paper I (Maíz Apellániz et al. 2015), the extinction results derived there, and additional spectra. Results: We have measured equivalent widths, velocities, and FWHMs for a large number of absorption lines in the rich ISM spectrum in front of Berkeley 90. The absorbing ISM has at least two clouds at different velocities, one with a lower column density (thinner) in the K I lines located away from Berkeley 90 and another one with a higher column density (thicker) associated with the cluster. The first cloud has similar properties for both O-star sightlines but the second one is thicker for LS III +46 11. The comparison between species indicate that the cloud with a higher column density has a denser core, allowing us to classify the DIBs in a sigma-zeta scale, some of them for the first time. The LS III +46 12 sightline also has a high-velocity redshifted component.
Comments: Accepted for publication in A&A
Subjects: Astrophysics of Galaxies (astro-ph.GA); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1508.07193 [astro-ph.GA]
(or arXiv:1508.07193v2 [astro-ph.GA] for this version)
Journal reference: A&A 583, A132 (2015)
Related DOI: https://doi.org/10.1051/0004-6361/201526696
From: Jesús Maíz Apellániz [view email]
[v1] Fri, 28 Aug 2015 13:15:54 UTC (512 KB)
[v2] Thu, 24 Sep 2015 07:43:29 UTC (512 KB)
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