The big dipper to learn about accretion disks and their ionized atmosphere

Details The big dipper to learn about accretion disks and their ionized atmosphere The big dipper to learn about accretion disks and their ionized atmosphere

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...92b&link_type=abstract

XMM-Newton Proposal ID #04023302

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, X 1624-490, X 1624-490, Xmm-Newton Proposal 04023302

Scientific paper

With the discovery of FeXXV and FeXXVI absorption lines in the dipping systems (viewed close to the disk plane), XMM has revealed the existence of a highly-ionized atmosphere above the accretion disk in low-mass X-ray binaries. We have further demonstrated that the spectral changes during dips, both in the lines and in the continuum could be explained by a decrease in the ionization level of this plasma. We want to investigate the structure of the disk and of its ionized atmosphere through time-resolved spectroscopy of the dips in X 1624-490. Using the orbital ephemeris, we propose to trigger 4 observations, each one centered on one dip, for a total exposure of 104 ks.

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