利用两微米巡天公开图像探测大振幅变星的性质
Properties of Large-Amplitude Variable Stars Detected With Two Micron All Sky Survey Public Images
摘要：
我们提出了一个目录的变星在近红外波段检测的重叠区域的2 MASS公共图像，并讨论他们的属性。研究区域位于银河系中心的方向（-30 < l < 20，|b| < 20），它覆盖了整个凸起。我们共探测到136颗变星，其中6颗已知变星，118颗分布在|b| < 5区。此外，84颗变星在DSS图像中有光学对应物。三个图（色星等图、光变图和色色图）表明，大多数被探测到的变星应该是大振幅长周期变星，如Mira变星或OH/IR星。所探测到的变星的数密度分布表明，它们跟踪了银河系核球的条结构。
英文摘要：
We present a catalogue of variable stars in the near-infrared wavelength detected with overlapping regions of the 2MASS public images, and discuss their properties. The investigated region is in the direction of the Galactic center (-30 < l < 20, |b| < 20), which covers the entire bulge. We have detected 136 variable stars, of which 6 are already-known and 118 are distributed in |b| < 5 region. Additionally, 84 variable stars have optical counterparts in DSS images. The three diagrams (colour-magnitude, light variance and colour-colour diagrams) indicate that most of the detected variable stars should be largeamplitude and long-period variables such as Mira variables or OH/IR stars. The number density distribution of the detected variable stars implies that they trace the bar structure of the Galactic bulge.
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