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An extreme oxygen-rich red hypergiant that has experienced two dimming periods in the 20th century where the star became dimmer by up to 2.5 magnitudes. [14] Potentially the largest known star. [12] There is a possilbility that this size might be a bit overestimated (on the order of 1 sigma). Hence, the quoted radius might be just an upper ...
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved as separate stars using a telescope , in which case they are called visual binaries .
At a distance of 14.1 light-years it is the third closest of its type of star after Sirius B and Procyon B, in that order. [ 10 ] [ 11 ] Discovered in 1917 by Dutch–American astronomer Adriaan van Maanen , [ 12 ] Van Maanen 2 was the third white dwarf identified, after 40 Eridani B and Sirius B, and the first solitary example.
This red dwarf has a size comparable to that of the planet Saturn. As of 2019, it is the second lightest hydrogen-fusing star known, marginally heavier (0.0777-0.0852M ☉) than the 2MASS J0523-1403. Although its mass is comparable to that of TRAPPIST-1, its radius is 1/3 smaller. [63] [64] [65] Luhman 16 A 60,768 Brown dwarf
The unrelated, fainter star Sidus Ludoviciana can be seen lower down. Mizar is a visual double with a separation of 14.4 arcseconds, each of which is a spectroscopic binary. Its combined apparent magnitude is 2.04. The two visible stars are referred to as ζ 1 and ζ 2 Ursae Majoris, or Mizar A and B. The spectroscopic components are generally ...
Neutron stars have a radius on the order of 10 kilometers (6 mi) and a mass of about 1.4 M ☉. [2] Stars that collapse into neutron stars have a total mass of between 10 and 25 solar masses (M ☉), or possibly more for those that are especially rich in elements heavier than hydrogen and helium. [3]
WR 20a is an eclipsing binary star belonging to or recently (0.5 millions years before present) ejected from the young, massive cluster Westerlund 2. [8] It was discovered in 2004 to be one of the most massive binary systems known, for which the masses of the components have been accurately measured.
Massive stars have a minimum mass of 5–10 M ☉. These stars undergo carbon fusion, with their lives ending in a core-collapse supernova explosion. [2] [dubious – discuss] Black holes created as a result of a stellar collapse are termed stellar-mass black holes. The combination of the radius and the mass of a star determines the surface ...