Norton & Watson 1989

Bibinfo (this paper at ADS): Norton, A.J., Watson, M.G., 1989, MNRAS 237, 853-874.
Type: Observational: X-rays
Object(s): AE Aqr, FO Aqr, BG CMi, TV Col, TX Col, EX Hya, GK Per, AO Psc, and V1223 Sgr, as well as V603 Aql, V533 Her, V426 Oph, and SW UMa.
Results: X-ray spin pulse fraction increases towards lower energies, thus indicating photoelectric absorption; yet normalization changes are also required. The energy dependence of pulse fraction is not consistent with a simple absorber.

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