2015A&A...583A.132M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:07:30

2015A&A...583A.132M - Astronomy and Astrophysics, volume 583A, 132-132 (2015/11-1)

The little-studied cluster Berkeley 90. II. The foreground ISM.

MAIZ-APELLANIZ J., BARBA R.H., SOTA A. and SIMON-DIAZ S.

Abstract (from CDS):

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. 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. We used the multiepoch high-S/N optical spectra presented in Paper I, the extinction results derived there, and additional spectra. 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 Ki 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.

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: lines and bands - open clusters and associations: individual: Berkeley 90 - stars: early-type - stars: individual: LS III +46 11 - stars: individual: LS III +46 12

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LBN 357 HII 20 35 02 +47 02.4           ~ 21 0
2 LS III +46 11 s*b 20 35 12.6367860828 +46 51 12.105513052 12.46 12.295 10.926 10.005   O3.5If*+O3.5If* 25 0
3 2MASS J20351402+4650549 * 20 35 14.0416519589 +46 50 54.748933309           ~ 2 0
4 Cl Berkeley 90 OpC 20 35 15 +46 50.5           ~ 20 0
5 LS III +46 12 * 20 35 18.5653057894 +46 50 02.911695779 11.07 11.217 10.262 9.640   O4.5IV(f) 24 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:07:30

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