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The X-ray pulse profile of BG CMi |
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| Authors: | Chul-Sung Choi Tadayasu Dotani Yonggi Kim Dongsu Ryu |
| Affiliation: | aInternational Center for Astrophysics, Korea Astronomy and Space Science Institute, 36-1 Hwaam, Yusong, Daejon 305-34, Republic of Korea bInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan cUniversity Observatory, Chungbuk National University, Cheongju 361-763, Republic of Korea dDepartment of Astronomy and Space Science, Chungnam National University, Daejon 305-764, Republic of Korea |
| Abstract: | We present an analysis of the X-ray data of a magnetic cataclysmic variable, BG CMi, obtained with ROSAT in March 1992 and with ASCA in April 1996. We show that four peaks clearly exist in the X-ray pulse profile, unlike a single peak found in the optical profile. The fluxes of two major pulses are 2–5 times larger than those of two minor pulses. The fraction of the total pulsed flux increases from 51% to 85% with increasing energy in 0.1–2.0 keV, whereas it decreases from 96% to 22% in 0.8–10 keV. We discuss the implications of our findings for the origin of the pulse profile and its energy dependence. |
| Keywords: | Cataclysmic variables Close binaries Individual stars (BG CMi) X-ray binaries |
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