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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20181122T103000
DTEND;TZID=Atlantic/Canary:20181122T113000
UID:iactalks-1211
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1211
CREATED:2018-11-22T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Gas and dust in the diffuse interstellar medium: new surveys of dif
 fuse interstellar bands and dust polarisation
DESCRIPTION:Gas and dust in the diffuse interstellar medium: new surveys of
  diffuse interstellar bands and dust polarisation\nDr. Nick Cox\n\nThe com
 position and nature of interstellar dust grains and the molecular  composi
 tion of interstellar gas are important factors in understanding  the chemi
 stry and physics of the diffuse interstellar medium and its  role in star 
 formation and galaxy evolution. In this contribution we  present the first
  results from two VLT surveys studying in detail the  nature and propertie
 s of interstellar gas and dust in diffuse clouds.  The ESO diffuse interst
 ellar band large exploration survey (EDIBLES)  focusses on the atomic and 
 molecular content of the diffuse ISM by  probing the lines-of-sight toward
 s ~120 bright OB stars. This survey  provides a deep census of interstella
 r atomic and molecular abundances  and diffuse interstellar band (DIB) abs
 orptions in the  diffuse/translucent ISM. The goal of EDIBLES is to `rever
 se-engineer'  the physical properties of the carriers of the enigmatic uni
 dentified  diffuse interstellar bands as a contribution towards their  ide
 ntification. I will present the first results related to DIB  profiles, in
 terstellar hydrides, and the C60 fullerene.  The large interstellar polari
 sation survey (LIPS) is a medium-resolution  spectropolarimetry study with
  FORS2 (and WHT) to measure the  wavelength-dependent polarisation of star
 light by aligned interstellar  dust grains in ~100 lines-of-sight (a large
  fraction overlapping with  EDIBLES). We investigate the variations (evolu
 tion) of dust grains  through a parametrised Serkowski-law fitting of thes
 e curves. The  polarisation spectra are combined with UV extinction curves
  and modelled  simultaneously with a physical dust grain model. We present
  the first  observational results in terms of the Serkowski-parameters as 
 well as  the dust modelling of a sub-set of the targets, in particular our
  study  of “single-cloud” sightlines.  Together, EDIBLES and L
 IPS provide a new comprehensive examination of  the molecules and dust pro
 perties in a statistically large sample of  Galactic sightlines.
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