Abstract for Proposal 096431
Exploring dust in the star forming region towards Cyg X-1
Cyg X-1 is a bright nearby source, located in a complex dusty region. Its
dust grains and gas characteristics differ from the average of the diffuse
medium, providing unique insights into dust in a star and planets forming
site. Using the high-resolution of XMM-Newton-RGS we will characterise
the chemistry, size and abundance of interstellar dust around the oxygen
spectral region, fundamental to determine the silicate contribution to
the dust composition. Using the joint HST-STIS observation we will model
the extinction curve and carbon features, giving unique insight on the
dust size distribution and carbon content along this line of sight.
Details on Observing Strategy and Trigger Criteria
We will trigger the XMM observation when the MAXI c/r is > 1.5 ph/cm^2/s
in the 2-4 keV band. Trigger probability is 0.6. The XMM observation
should be performed about one week after the trigger. The joint HST-STIS
observation can be planned at ease, as there is no need for simultaneity.