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A new disaster discovered by astronomers

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by Tomasz Nowakowski, Phys.org

To find a chart of XMM 152737 with North at the top and East to the left. The image is from the Digitized Sky Survey (DSS) and the new object is marked with red lines. The scale is shown in the lower left. Credit: Ok et al., 2024.

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To find a chart of XMM 152737 with North at the top and East to the left. The image is from the Digitized Sky Survey (DSS) and the new object is marked with red lines. The scale is shown in the lower left. Credit: Ok et al., 2024.

By analyzing data from ESA’s XMM-Newton and Gaia satellites, astronomers from the Leibniz Institute for Astrophysics Potsdam (AIP) in Germany and elsewhere have discovered a new pattern of magnetic fluctuations, which probably of the polar type. The findings were reported in a research paper published on March 21 in the first print server arXiv.

CVs are binary star systems that include a white person and a common star companion. They increase the brightness abnormally by a large factor, and then decrease to a quiet state. Polars are a sub-category of different types of crisis that are distinguished from other CVs by the presence of a strong magnetic field in their whites.

A team of astronomers led by Samet Ok of AIP, has identified a new type of crash, which has received the name XMM J152737.4-205305.9 (or XMM 152737 for short), by matching the CV candidate list released by Gaia Data Release 3 (DR3) and the XMM-Newton repository.

A new disaster discovered by astronomers

“In order to see and identify new types of magnetic crisis, we linked the source links to this list. [DR3] in the XMM-Newton database,” the researchers wrote in the paper.

According to the study, XMM 152737 has one period consistent with the synchronous rotation characteristic seen at the polar. The system exhibits harmonics in its energy spectrum and has a short orbital period, which is often seen in known polar regions.

The source was found to show two distinct dips that show a repeating pattern with an exact period of about 112.4 minutes. The scientists explained that such dips could be caused by the dimming of the white light by the host star or the dimming of the accretion area in the white space due to the increasing current.

The observations show that XMM 152737 has prominent emission lines consistent with hydrogen and helium. This result strongly suggests that this object is a polar type of catastrophe.

The study found that XMM 152737 is located 3,770 light-years away from Earth and its X-ray luminosity is estimated to be between 30 and 60 nonillion erg/s. Assuming that the system is darkening, the authors of the paper calculated that the “white dwarf” and the “secondary star” have masses of 0.8 and 0.14 respectively.

Summarizing the results, the researchers noted that further observations of XMM 152737 are needed to determine the dips seen in this system. This can provide more information about the properties of this type of disaster and confirm whether it is divided into polar groups.

Additional information:
Samet Ok et al, Discovery of strong magnetic flux XMM J152737.4-205305.9 with a deep eclipse-like feature, arXiv(2024). DOI: 10.48550/arxiv.2403.14278

Newspaper articles:
arXiv

#disaster #discovered #astronomers‘Cutting sound waves’ offer the miracle of combining ultrasound and magnetic waves

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