New limits on the orbital parameters of 1E 1048.1–5937 and 1E 2259+586 from RXTE observations

New limits on the orbital parameters of 1E 1048.1–5937 and 1E 2259+586 from RXTE observations
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RXTE 观测对 1E 1048.1–5937 和 1E 2259+586 轨道参数的新限制

DOI:
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发表时间:
1997
期刊:
影响因子:
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通讯作者:
L. Stella
L. Stella
中科院分区:
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文献类型:
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作者:
S. Mereghetti;G. Israel;L. Stella

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本文报道了Rossi X射线定时探测器(RXTE)对异常X射线双星1 E 1048.1-5937和1 E 2259+586的观测结果。在1995/96年期间,这两个来源继续几乎不断地减少。我们进行了搜索的轨道多普勒频移,在他们观察到的自旋频率,推导出严格的限制投影半轴。除非这些系统有不太可能的小倾角,否则主序星伴星可以被排除。如果1 E 1048.1-5937和1 E 2259+586确实是双星系统,它们的伴星一定是白色矮星,或者是M 0.8 M的氦燃烧恒星,可能未填满它们的洛希叶。
We report on two Rossi X-ray Timing Explorer (RXTE) observations of the anomalous X-ray pulsars 1E 1048.1–5937 and 1E 2259+586. Both sources have continued their almost constant spin-down during 1995/96. We carried out a search for orbital Doppler shifts, in their observed spin frequencies, deriving stringent limits on the projected semi-axis. Unless these systems have unlikely small inclinations, main-sequence companions can be excluded. If 1E 1048.1–5937 and 1E 2259+586 are indeed binary systems, their companion stars must be either white dwarfs, or helium-burning stars with M≲ 0.8 M⊙, possibly underfilling their Roche lobe.