论文标题
用Astrosat软X射线望远镜观察明亮的恒星
Observations of bright stars with AstroSat Soft X-ray Telescope
论文作者
论文摘要
我们介绍了使用Astrosat软X射线望远镜（SXT）观察到的四个明亮恒星的观察结果。像这样明亮恒星的可见光可以通过SXT的焦平面CCD摄像头的CCD前面的非常细的过滤器泄漏，从而使X射线事件的提取变得困难。在这里，我们展示了如何在没有可见光污染的情况下提取X射线事件。此处适用于四个明亮恒星的过程展示了在这种情况下如何得出可靠的X射线信息。这里研究的明亮恒星样品包括两种光谱类型（HIP 19265，HIP 88580），一个G/K巨型（Capella）和附近的M型矮人（HIP 23309）。如预期的那样，从A型恒星中未观察到X射线发射。 Capella和Hip 23309的X射线光谱在此处得出和建模，并与这些恒星的先前X射线观测值进行了比较，以显示所使用的方法的可靠性。我们发现，对于v = 8 mag的恒星，光灯可以开始在0.5 keV的非常软能带中泄漏。在此过程中，我们介绍了髋关节23309的第一个X射线频谱。
We present observations of four bright stars observed with the AstroSat Soft X-ray Telescope (SXT). Visible light from bright stars like these can leak through the very thin filter in front of the CCD in the focal plane CCD camera of the SXT and thus making the extraction of X-ray events difficult. Here, we show how to extract the X-ray events without contamination by the visible light. The procedure applied to four bright stars here demonstrates how reliable X-ray information can be derived in such cases. The sample of bright stars studied here consists of two A spectral types (HIP 19265, HIP 88580), one G/K Giant (Capella), and a nearby M-type dwarf (HIP 23309). No X-ray emission is observed from the A-type stars, as expected. X-ray spectra of Capella and HIP 23309 are derived and modeled here, and compared with the previous X-ray observations of these stars to show the reliability of the method used. We find that optical light can start to leak in the very soft energy bands below 0.5 keV for stars with V=8 mag. In the process, we present the first X-ray spectrum of HIP 23309.
