Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295..167a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 295, p. 167
Astronomy and Astrophysics
Astronomy
32
White Dwarf Stars, X Ray Astronomy, Spectral Resolution, Astronomical Spectroscopy, Accretion Disks, Astronomical Models, Temperature Distribution, Shock Waves
Scientific paper
We analyze the spectral changes over the spin modulation in the intermediate polar EX Hya using archival ASCA data. We find that the modulation can be modelled as either (1) the effect of occultation of the accretion poles by the limb of the white dwarf, or (2) the effect of phase-dependent photoelectric absorption. We argue, on the basis of the partial X-ray eclipse, that the accretion columns in the system are tall, with shock height Rwd, and hence that the spin modulation is caused mainly by occultation. We find that the temperature distribution along the accretion shocks is incompatible with the calculations of Aizu, except for a restricted parameter regime with a high Mwd. Hence the material in the shock must cool faster than predicted by theory.
Allan Alasdair
Beardmore Andrew
Hellier Coel
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