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首页> 外文会议>The energetic cosmos : from Suzaku to ASTRO-H >Orbital Modulation and a New Ephemeris of Cygnus X-3
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Orbital Modulation and a New Ephemeris of Cygnus X-3

机译：轨道调制和天鹅座X-3的新星历

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摘要

We investigate an orbital X-ray modulation of the enigmatic X-ray binary, Cygnus X-3. It is a close binary system, composed of a Wolf-Rayet (WR) star and a compact star with a 4.8h orbital period. We determine a new precise orbital ephemeris and found that the orbital period is monotonically increasing with 1/2PP = (5.62 ± 0.09) × 10~(-11) day, over more than three decades from 1970s. The obtained period derivative is explained by an intense stellar wind from the WR star with ~ 10~(-6~-5) M_⊙ yr~(-1). This mass loss rate is a reasonable value as a Wolf-Rayet star. This thick wind exposed to intense X-rays should be photo-ionized. Observed rich emission lines come from this photo-ionized plasma as well as some narrow radiative recombination continuums (RRCs). We investigate an orbital modulation of the emissions lines and the RRCs. We found that the emission lines show a large equivalent width around phase 0.0 (phase 0.0 means the X-ray intensity minimum phase). However, the RRCs show different modulation pattern from that of the emission lines.
机译：我们研究了神秘的X射线二进制Cygnus X-3的轨道X射线调制。它是一个封闭的双星系统，由Wolf-Rayet（WR）星和一个轨道周期为4.8h的紧凑型恒星组成。我们确定了一个新的精确轨道星历，发现从1970年代起的三十多年中，轨道周期以1 / 2PP =（5.62±0.09）×10〜（-11）天单调增加。所获得的周期导数是由来自WR恒星的强烈恒星风解释的，该恒星风具有〜10〜（-6〜-5）M_⊙yr〜（-1）。作为沃尔夫-雷耶特星，该质量损失率是一个合理的值。暴露在强力X射线下的浓风应该被电离。观察到的富发射线来自该光离化等离子体以及一些狭窄的辐射重组连续体（RRC）。我们研究了排放线和RRC的轨道调制。我们发现发射线在相位0.0周围显示出较大的等效宽度（相位0.0表示X射线强度最小相位）。然而，RRC显示出与发射线不同的调制模式。

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