Bibcode
Maíz Apellániz, J.; Barbá, R. H.; Sota, A.; Simón-Díaz, S.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 583, id.A132, 11 pp.
Fecha de publicación:
11
2015
Revista
Número de citas
15
Número de citas referidas
13
Descripción
Context. Nearly one century after their discovery, the carrier or
carriers of diffuse interstellar bands (DIBs) 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 toward 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 used
the multiepoch high-S/N optical spectra presented in Paper I, the
extinction results derived there, and additional spectra.
Results: We 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 with a higher column density
(thicker) associated with the cluster. The first cloud has similar
properties for both O-star sightlines, but the second 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 σ-ζ scale, some of these for the first time. The LS
III +46 12 sightline also has a high-velocity redshifted component.
Proyectos relacionados
Proyecto IACOB: Una Nueva Era en el Estudio de Estrellas OB Galácticas
Massive stars has been many times claimed as Cosmic Engines and Gifts of Nature for the study of the Universe, from the Solar neighbourhood to the large-z Universe. The complete understanding of the physical properties and evolution of massive stars (and their interplay with the ISM) is crucial for many fields of Astrophysics and, ultimately, to
Sergio
Simón Díaz