标题： 使用XMM-Newton/RGS对CAL 83的高分辨率光谱观测 显示英文标题

标题： A High Resolution Spectroscopic Observation of CAL 83 with XMM-Newton/RGS

摘要： 我们展示了第一幅高分辨率的光球面X射线谱，这是大麦哲伦星云中著名的超软X射线源CAL~83。该光谱是在XMM-Newton天文台的校准/性能验证阶段，利用反射光栅光谱仪获得的。该光谱覆盖了20至40埃的范围，在大约恒定的0.05埃分辨率下显示出非常显著且复杂的细节，这些细节对天体物理性质非常敏感。我们展示了对该光谱初步研究的结果，并得出结论认为，光谱结构可能主要由中等$Z$元素L壳层和铁M壳层的许多吸收特征以及少数由CNO的K壳层引起的强吸收特征主导。 显示英文摘要

摘要： We present the first high resolution photospheric X-ray spectrum of a Supersoft X-ray Source, the famous CAL~83 in the Large Magellanic Cloud. The spectrum was obtained with the Reflection Grating Spectrometer on XMM-Newton during the Calibration/Performance Verification phase of the observatory. The spectrum covers the range 20-40 A at an approximately constant resolution of 0.05 A, and shows very significant, intricate detail, that is very sensitive to the physical properties of the object. We present the results of an initial investigation of the spectrum, from which we draw the conclusion that the spectral structure is probably dominated by numerous absorption features due to transitions in the L-shells of the mid-$Z$ elements and the M-shell of Fe, in addition to a few strong K-shell features due to CNO.