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The actual limit-point mass depends on how opaque the gas in the star is, and metal-rich Population I stars have lower mass limits than metal-poor Population II stars. Before their demise, the hypothetical metal-free Population III stars would have had the highest allowed mass, somewhere around 300 M ☉.
Widely recognised as being among the largest known stars, [26] radius decreased to ~500 R ☉ during the 2020 great dimming event. [73] R Horologii: 635 [74] L/T eff: A red giant star with one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye. Despite its large radius, it is less massive than the Sun.
SIMBAD. data. ARICNS. data. HD 140283 (also known as the Methuselah star) is a metal -poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy. Its apparent magnitude is 7.205, so it can be seen with binoculars. It is one of the oldest stars known.
Neutron star. Central neutron star at the heart of the Crab Nebula. Radiation from the rapidly spinning pulsar PSR B1509-58 makes nearby gas emit X-rays (gold) and illuminates the rest of the nebula, here seen in infrared (blue and red). A neutron star is the collapsed core of a massive supergiant star.
HE0107-5240. HE 0107-5240, 2MASS J01092916-5224341. HE0107-5240 is an extremely metal -poor Population II star, located roughly 36 000 light-years away from Earth. It is one of the most metal-poor stars known in our Galaxy, with a metallicity [Fe/H] = −5.2 ± 0.2; [3] i.e. it has just 1 160 000 of the metal that the Sun has.
A star is a massive luminous spheroid astronomical object made of plasma that is held together by its own gravity.Stars exhibit great diversity in their properties (such as mass, volume, velocity, stage in stellar evolution, and distance from Earth) and some of the outliers are so disproportionate in comparison with the general population that they are considered extreme.
Giant star. A giant star has a substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature. [1] They lie above the main sequence (luminosity class V in the Yerkes spectral classification) on the Hertzsprung–Russell diagram and correspond to luminosity classes II and III. [2]
HE 2359-2844 is a subdwarf located approximately 800 light years away in the constellation Sculptor, with a surface temperature of approximately 38,000 °C (68,400 °F). Along with stars HE 1256-2738 and LS IV-14 116, HE 2359-2844 forms a new group of star called heavy metal subdwarfs.
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