W Ursae Majoris

Starbox begin
name=W Ursae Majoris Starbox observe
epoch=J2000
ra=09^h 43^m 45.5^s
dec=+55° 57′ 09″
appmag_v=7.75–8.48
constell=Ursa Major Starbox character
class=F8Vp / F8Vp
b-v=0.66
u-b=0.08
variable=W Ursae Majoris Starbox astrometry
radial_v=-46
prop_mo_ra=15.55
prop_mo_dec=-27.35
parallax=20.17
p_error=1.05
dist_ly=162
dist_pc=50
absmag_v= Starbox detail
mass=0.99/0.62
radius=1.14/0.83
luminosity=1.45/1.0
temperature=?
metal=?
rotation=?
age=? Starbox catalog
names=BD +56°1400, HD 83950, SAO 27364, ADS 7494, CCDM 09438+5557, HIP 47727.

W Ursae Majoris (W UMa) is a variable star in the constellation Ursa Major. It is an eclipsing contact binary whose two component stars share a common outer layer, and is the prototype of a class of contact binary variables known as W Ursae Majoris variables. Unlike with normal eclipsing binaries, the contact nature makes it impossible to tell when an eclipse of one component by the other starts or ends precisely. During an eclipse its apparent magnitude ranges between 7.75 and 8.48 over a period of 8 hours. Because the two components share their outer layers, they have the same stellar classification, and are classified as yellow F-type main sequence dwarfs.