血战钢锯岭

天文学家发现“灾难性变量”系统：证实了几十年前的预测_我的网站

A |     需要说明的是，这并不是科学记者的夸张之词。天文学家称这些系统为灾难性变星是一个恰当的描述。

B | 这个术语描述了一个白矮星和一个次级“正常”恒星的配对，前者是一颗曾经强大的恒星的密集残余物，后者跟太阳类似但质量可能较小。

C | 在这对组合的紧密轨道上，白矮星由于其极端的引力而从较大的恒星上吸走恒星物质。    

China's Embassy in the Philippines on Saturday rejected Philippine Defense Secretary Gilberto Teodoro Jr.'s renewed allegations over 70 Chinese workers at a steel plant in Mindanao who were arrested and later released, citing a prosecutorial resolution ordering their release while questioning the military's involvement, the workers' harsh detention conditions and possible selective law enforcement.
The statement came after Teodoro, who was sanctioned by China in June, accused the Chinese Foreign Ministry on Saturday of continuing to evade what he called the "crucial issue": whether the Chinese nationals arrested in the Philippines were involved in illegal activities, and whether Chinese embassy officials have intervened in local law enforcement processes, according to Philstar.
Ji Lingpeng, spokesperson for the Chinese Embassy in the Philippines, directly addressed both questions in Saturday's statement.
Ji noted that a May 28 resolution by Philippine prosecution authorities had found insufficient evidence to support allegations against the workers and ordered all 70 Chinese nationals to be released.
"Yet Teodoro continues to accuse them of engaging in illegal activities in the Philippines. Does he respect the rule of law and the decisions of the judiciary?" Ji asked.
Ji also questioned whether violations of Philippine law should be determined by the defense secretary or the country's judicial authorities.
"Secretary Teodoro's remarks are completely unfounded. They distort the facts and turn black into white," Ji said.
The embassy raised multiple questions about the May operation, which Ji said Teodoro had instructed the Philippine armed forces to join. The spokesperson asked why unarmed workers rather than those responsible for managing the plant had been detained, why only Chinese workers were arrested while Filipino employees were released at the scene, and why the Chinese nationals were transported to Manila aboard a military aircraft.
The embassy also said some workers had been instructed to put on personal protective equipment and pose for photographs during the raid, which were subsequently used in publicity surrounding the case.
Responding to Teodoro's claim that the embassy had intervened in Philippine law enforcement, Ji said anyone with a basic understanding of diplomacy would know that protecting the safety and legitimate rights and interests of its nationals is a fundamental responsibility of an embassy.
"Regardless of the reason a Chinese national is detained, the Chinese Embassy has the right and responsibility to conduct consular visits, provide consular protection, make communication with and demarches to relevant Philippine law-enforcement authorities to ensure humane, fair and just treatment of detained Chinese nationals," Ji said.
"We fully respect the Philippines' judicial sovereignty and the lawful handling of cases by its relevant law-enforcement authorities," Ji said. "If solid evidence proves a foreign national is in violation of Philippine law, he or she shall be brought to justice in accordance with the law. The same is true in China. However, we firmly oppose any discriminatory or selective law enforcement campaigns targeting Chinese nationals by the Philippine side out of political considerations."
The Philippine Department of National Defense responded in a separate statement on Sunday, claiming that "The Chinese Embassy's response does not contain any answers," adding that "this is, in legal practice, an implied admission of culpability," according to Inquirer.net.
All 70 Chinese nationals associated with the steel plant in Mindanao have been released, Xinhua News Agency reported in June. The Manila Times reported that they were released after authorities cited insufficient evidence of specific immigration and labor violations.
Renewing allegations against the Chinese workers after their release for insufficient evidence lacks justification, Chen Xiangmiao, director of the World Navy Research Center at the National Institute for South China Sea Studies, told the Global Times on Sunday.
Having a defense secretary personally direct the armed forces to participate in an operation targeting civilian workers departs from normal law enforcement procedures, Chen said. Teodoro's continued politicization of the case after the workers' release reflects an intensification of anti-China agitation by certain forces in the Philippines, he noted.
Selective investigations and enforcement targeting Chinese nationals are driven not by law but by political manipulation designed to cater to domestic anti-China sentiment, Chen said.
The trend shows that anti-China forces represented by Teodoro intend to continue fomenting hostility toward China, shaping negative public perceptions and provoking antagonism between the peoples of the two countries, with serious consequences for bilateral relations, he added.
The resulting hostile environment could also have severe negative consequences for Chinese investment in the Philippines and normal people-to-people exchanges, he said.
Chinese Foreign Ministry spokesperson Guo Jiakun said on Friday that "it's learned that it was exactly this defense secretary who personally led the armed forces to seize and detain Chinese nationals lawfully working in the Philippines. This person's consistent attacks and smears against China harm not only the bilateral relations. It is the interests of the Philippines and all its people that will bear the brunt."
。周三发表在《自然》上的新灾难性变量的发现其特点是一颗大小为太阳1/100的白矮星和一颗更大的恒星--约是太阳质量的10%并挤在一个木星大小的球体中。这对恒星距离地球约3000光年，其被标记为ZTF J1813+4251。它是在兹威基瞬变设施拍摄的图像中被发现，这是一项广域调查，其使用加州帕洛玛天文台的一台望远镜并依次拍摄数百张天空图像。兹威克瞬变设施目录使天文学家能寻找恒星亮度的快速变化。这就是研究人员发现这对奇特的星体的方式。“这是一个特殊的系统，”麻省理工学院的天体物理学家Kevin Burdge说道。他指出，这是已知的行为最优美的灾难性变数之一。Burdge和他的同事们搜索了茨威基的数据以试图在深黑的太空中找到灯塔。他们希望看到有规律的眨眼特征--Burdge通常在寻找快速的眨眼，这是因为它们往往是一对恒星快速运行的信号。研究小组看到ZTF J1813+4251每51分钟闪烁一次。据悉，这是其中一颗恒星从另一颗恒星前面经过并使其光线变暗。

D | 闪烁的时间跟迄今为止发现的灾难性变星的最短轨道相吻合。通过用夏威夷和西班牙的其他望远镜以及天基望远镜进行观测，这使得研究人员对恒星变得更加集中，并能更准确地测量它发出的光线。不过这引发了一个难题。Burdge在一份新闻稿中指出：“有一颗恒星看起来像太阳，但是太阳无法进入一个短于8小时的轨道。”太阳的质量使它无法拥有如此紧密的轨道。那么为什么这颗木星大小的恒星会这样做呢？Burdge和研究小组已经确定的解释是，这颗白矮星一直在吞噬其伙伴星的一大块氢。这留下了一个更密集的氦气核心，而这有助于稳定紧密的轨道。

E | 简而言之，研究小组是在这一过程的中间阶段观察这对恒星的，当时白矮星已经剥去了大部分的氢。剥离后的白矮星留下了一个吸积盘，它像土星环一样围绕着核心。“这是一个罕见的案例，我们在从氢到氦的吸积过程中抓住了其中的一个系统，”Burdge说道。在12亿颗恒星中，该算法挑出了我们迄今发现的最有趣的灾难性变数之一。这一幸运的发现有助于支持早先提出的关于大灾变体过渡到超短轨道的理论，该理论是在近四十年前提出的--现在我们知道这确实发生了。该小组还进行了模拟以确定ZTF J1813+4251的最终命运。他们预测，在约7000万年后，这对天体将更快地围绕对方运行，每18分钟做一次完整的循环。

F | 尽管人们不会看到它，但一旦激光干涉仪空间天线(LISA)在2030年代末的某个时候进入轨道，那么研究人员将能更详细地研究这个灾难性的变量。这一系列卫星将被用来探测引力波--这些恒星舞伴将产生引力波。

G |

Current article:http://v42l5.chengjuecannaobianmouqueduoyu.shop/wln/qbhv.html

Published on:19:23:19