W Ursae Majoris variable - significado y definición. Qué es W Ursae Majoris variable
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Qué (quién) es W Ursae Majoris variable - definición


W Ursae Majoris variable         
  • Schematic of a W Ursae Majoris variable with a mass ratio of 3. Both stars (the filled regions) overfill their Roche lobes (enclosed by the black lines).
  • TESS]]'' data<ref name=MAST/>
TYPE OF VARIABLE STAR
W Ursae Majoris variables; W Ursae Majoris star; W Uma star
A W Ursae Majoris variable, also known as a low mass contact binary, is a type of eclipsing binary variable star. These stars are close binaries of spectral types F, G, or K that share a common envelope of material and are thus in contact with one another.
Alioth         
  • TESS]]'' data<ref name=MAST/>
STAR IN THE CONSTELLATION URSA MAJOR
Epsilon Ursae Maioris; Alioth; Aliath; Allioth; HIP 62956; Alioth (star); Ε Ursae Majoris; Ε UMa; 77 Ursae Majoris; Star Alioth; Epsilon UMa
·noun A star in the tail of the Great Bear, the one next the bowl in the Dipper.
Epsilon Ursae Majoris         
  • TESS]]'' data<ref name=MAST/>
STAR IN THE CONSTELLATION URSA MAJOR
Epsilon Ursae Maioris; Alioth; Aliath; Allioth; HIP 62956; Alioth (star); Ε Ursae Majoris; Ε UMa; 77 Ursae Majoris; Star Alioth; Epsilon UMa

Epsilon Ursae Majoris is a star in the northern constellation of Ursa Major. The designation is Latinised from ε Ursae Majoris and abbreviated Epsilon UMa or ε UMa. It is officially named Alioth . Despite being designated "ε" (epsilon), it is the brightest star in the constellation and at magnitude 1.77 is the thirty-third brightest star in the sky.

It is the star in the tail of the bear closest to its body, and thus the star in the handle of the Big Dipper (or Plough) closest to the bowl. It is also a member of the large and diffuse Ursa Major moving group. Historically, the star was frequently used in celestial navigation in the maritime trade, because it is listed as one of the 57 navigational stars.