Open AccessThe multi‐temperature X‐ray spectrum of the intermediate polar V1223 Sagittarii
Author(s) -
Beardmore A. P.,
Osborne J. P.,
Hellier C.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03477.x
Subject(s) - physics , astrophysics , white dwarf , spectral line , intermediate polar , polar , absorption (acoustics) , reflection (computer programming) , absorption spectroscopy , astronomy , optics , stars , programming language , computer science
We describe fits to the Ginga LAC and ASCA GIS and SIS X‐ray spectra of the intermediate polar V1223 Sgr using a multi‐temperature emission model and including reflection from the white dwarf surface. Shock temperatures of and were obtained for the Ginga LAC, ASCA GIS and SIS instruments, respectively, giving a mean value of The data reveal significant amounts of reflection as well as a heavy metal underabundance by a factor of ∼2. Multiple absorption components are required to successfully model the observed X‐ray spectra at low energies, suggesting the presence of complex intrinsic absorption. All data sets reveal a low‐energy spectral hardening at the minimum in the spin cycle caused by an increase in the amount of absorption at this phase. The requirement of such complex absorption is becoming increasingly common in the good quality X‐ray spectra from magnetic cataclysmic variables.