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ASCA Observation of the polar RX J1802.1+1804 | | M. Ishida
; J. Greiner
; R.A. Remillard
; C. Motch
; | | Date: |
15 May 1998 | | Journal: | Astron.Astrophys. 336 (1998) 200 | | Subject: | astro-ph | | Affiliation: | ISAS), J. Greiner (AI Potsdam), R.A. Remillard (MIT), C. Motch (Strasbourg | | Abstract: | We present X-ray data of RX J1802.1+1804 obtained by ASCA. Although it shows a clear orbital intensity modulation with an amplitude of nearly 100% below 0.5 keV in ROSAT data, the ASCA light curves are nearly flat except for a possible dip lasting about one-tenth of the orbital period. We discuss this within the model assumption of a stream-eclipsing geometry as derived from the ROSAT observations. The ASCA X-ray spectrum can be represented by a two temperature optically thin thermal plasma emission model with temperatures of ~1keV and >7 keV, suggesting postshock cooling as observed in EX Hya. A remarkable feature of the spectrum is the strong iron K_alpha emission line whose equivalent width is ~4 keV. To account for this, an iron abundance of greater than at least 1.3 times Solar is required. A combined spectral analysis of the ROSAT PSPC and ASCA data indicates that the N_H-corrected flux ratio of the soft blackbody (0.1-2.4 keV) to the hard optically thin thermal plasma emission (2-10 keV) is as large as ~10^4. | | Source: | arXiv, astro-ph/9805211 | | Services: | Forum | Review | PDF | Favorites | |
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