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Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance between the two varies between 8.2 and 31.5 astronomical units as they orbit every 50 years.
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The brightest, most massive and most luminous object among those 131 is Sirius A, which is also the brightest star in Earth's night sky; its white dwarf companion Sirius B is the hottest object among them. The largest object within the 20 light-years is Procyon.
Sirius B is part of the Sirius binary star system. Sirius B may also refer to: Sirius B, a 2004 album by Therion; Sirius.B (band), a musical group from Asheville, ...
An artist's impression of Sirius A and Sirius B, a binary star system. Sirius A, an A-type main-sequence star, is the larger of the two. An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen burning) star of spectral type A and luminosity class V (five). These stars have spectra defined by strong hydrogen Balmer ...
Sirius.B's songs can be heard on regional radio stations such as 88.7FM WNCW, 105.9FM The Mountain, 98.1FM The River, 880AM The Revolution, [5] and Power 90.5FM. [6] They have also made a live appearance on the WDVX Knoxville Blue Plate Special, which has hosted other artists such as Bela Fleck and The Avett Brothers .
The well-known binary star Sirius, seen here in a Hubble photograph from 2005, with Sirius A in the center, and white dwarf, Sirius B, to the left bottom from it. A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.
If a star is in a binary system, as is the case for Sirius B or 40 Eridani B, it is possible to estimate its mass from observations of the binary orbit. This was done for Sirius B by 1910, [ 32 ] yielding a mass estimate of 0.94 M ☉ , which compares well with a more modern estimate of 1.00 M ☉ . [ 33 ]