Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..97e&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Other
Stellar Spectroscopy
Scientific paper
SS73 17 was an innocuous Mira-type symbiotic star until INTEGRAL and Swift discovered its bright hard X-ray emission. Suzaku observations then showedit emits three bright iron lines as well, with almost no emission in the 0.5-2 keV bandpass. We detected and confirmed strong emission lines of Fe K fluorescence, Fe XXV & Fe XXVI. We believe these thermal emissions lines are from the boundary layer of the accreting white dwarf. There is also Si XVI emission linewhich appears brighter than other lines which includes S XVI & Mg XII at the soft x-ray spectrum. We attribute the origin of these soft emission line to collisional ionization of the H-like particles falling into the potential well of the white dwarf. The soft x-ray emission lines could also be coming from leaking radiations from the absorber, which have gone through several scattering and re-absorptions before it get to our line of sight. Both observations show that the system is moderately variable as opposed to earlier result by Smith et al (2008).This result confirms the variability of the partial covering absorber campaign. We also found the source to be highly absorbed (NH = 14.65 × 10^{22}cm^{-2}) for the partial covering absorber and (NH = 1.59 × 10^{22}cm^{-2}) for the full covering absorber.
Eze Romanus
Luna Juan
Smith Randall
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