Tomasz Nowakowski is a member of the physics.org community.
An international team ofAstronomers have discovered in the atmosphere of a hot white dwarf, known as HD 149499B, by analyzing the data from the Far Ultraviolet Spectroscopic Explorer (FUSE) Telescope. This element has never been found in the atmosphere of a hot white dwarf.
A white dwarf is a stellar core left after a star has exhausted its nuclear fuel. They have atmospheres of either pure hydrogen or pure helium due to their high gravity. Some of theWDs show traces of heavier elements.
Only 18 trans-iron elements have been identified so far in the atmosphere of hot white dwarfs. The trans- iron elements were found to be overabundant.
A group of astronomer led by Pierre Chayer of the Space Telescope Science Institute in Baltimore, Maryland, have found a white dwarf with an effective temperature of 4 and an atomic number 55.
The first detection of the radioactive substance in the atmosphere of a white dwarf was reported. The researchers wrote that around a dozen absorption lines of Cs IV, Cs V, and Cs VI have been identified.
There were thirteen lines that were detected in the FUSE spectrum with the same width. The transitions come from low energy levels ranging from ten thousand to a few tens of thousands of cm 1.
Since the detection of germanium in 2005, the list of trans-iron elements in the atmospheres ofWDs has grown considerably.
In terms of the mass fraction, the abundance of Cesium in the atmosphere of HD 149449B is -5.95. HD 149499B contains the most abundant trans- iron element.
The researchers are trying to find the most plausible explanation for the presence of cesium in the white dwarf's atmosphere.
The most plausible natural phenomena to explain its presence is radiation levitation.
There is more information on the website. The hot He-rich white dwarf HD 149499B was detected with the help of Chayer and his colleagues. There is a book titled "arxiv.2211.01)
Journal information: arXiv
There is a science network.
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