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Астронет: Астрономическая картинка дня Сириус - самая яркая звезда на ночном небе http://variable-stars.ru/db/msg/1162793/eng |
Credit & Copyright: University of Leicester
Explanation:
Sirius is the brightest star in the night sky. Intrinsically,
Sirius is
over 20 times brighter than our
Sun and over twice as massive. As
Sirius is
8.7 light years distant, it is not the closest star system -- the
Alpha Centauri
system holds this distinction.
Sirius is called the Dog Star
because of its prominence in the constellation of Canis Majoris (Big Dog). In 1862,
Sirius was discovered to be a binary
star system with a companion star,
Sirius
B, 10,000 times dimmer than the
bright primary, Sirius A. Sirius B was the first white dwarf star
discovered, a type of star first understood by
Subrahmanyan Chandrasekhar in 1930.
While studying
Sirius
in 1718,
Edmond Halley discovered that stars move
with respect to each other. The Sirius system is shown above captured in
X-ray light.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.