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科学家发现两颗奇怪的死星，超出了天文学的预期
研究人员表示，孤立的白矮星甘道夫和月亮大小的白矮星定义了一类新的恒星遗迹，因为它们具有五个共同特征，包括 X 射线发射。在浩瀚的宇宙中，一个不寻常的天体可以促使天文学家寻找其他类似的天体，有时甚至会导致人们认识到一类全新的天体 [...]
来源:SciTech日报研究人员表示，孤立的白矮星甘道夫和月亮大小的白矮星定义了一类新的恒星遗迹，因为它们具有五个共同特征，包括 X 射线发射。
Across the immense scale of the Universe, a single unusual object can prompt astronomers to look for others like it, sometimes leading to the recognition of an entirely new class of stars.
In a paper published in Astronomy & Astrophysics and an arXiv preprint, researchers at the Institute of Science and Technology Austria (ISTA) describe two stellar remnants that share five traits, including X-ray emission, even though both appear to be isolated.研究小组认为，这两个物体足以建立一类新的恒星遗迹。
我们的太阳预计将在大约五到八十亿年后变成一颗白矮星。 A white dwarf is an extremely dense stellar remnant, roughly the size of Earth, left behind after a star has used up its fuel and shed its outer layers.
Although the Sun is alone, research over the last 15 years has shown that binary and multiple-star systems are much more common than astronomers previously realized.当像白矮星这样致密、致密的残余物成为双星系统的一部分时，它通常可以将物质从伴星上拉走。这个过程称为吸积，通常会产生 X 射线，这些 X 射线被视为特征信号。
Scientists in the group of Ilaria Caiazzo, assistant professor at the Institute of Science and Technology Austria (ISTA), have now confirmed X-ray signals from two isolated objects known as Gandalf and Moon-Sized.两者都具有高磁性，快速旋转，并被归类为“合并遗迹”，因为它们都是在猛烈的宇宙碰撞后形成的。由于它们在没有伴星的情况下发射 X 射线，因此这两个物体现在似乎定义了自己的一类。
Gandalf—the Lord of the Half Rings?
为了解决这个难题，研究小组转向了光学发射光谱，这是天文学中常用的观测方法。