Which galaxy does arcturus belong to?

Patriarch arcturus belongs to the Milky Way.

Arcturus, known as Alpha Star in the west, is the brightest star in Capricorn and the third brightest star in the whole sky. What is the apparent magnitude? 6? 10.05 and so on. , second only to Sirius and Canopus.

Arcturus is a red giant of K 1.5 IIIpe type, and "pe" stands for "special emission line", indicating that the spectrum emitted by arcturus is unusual and full of spectral lines. This is not uncommon for a red superstar, but arcturus is a particularly obvious example. The brightness of arcturus is at least 1 10 times that of the sun, but this underestimates its actual intensity, such as the "light" emitted by arcturus in the infrared band, so the energy emitted by arcturus is about 180 times that of the sun. Because the surface temperature of arcturus is lower than that of the sun, and its luminous efficiency is lower, the energy emitted in the visible light band is also lower.

Arcturus is famous for its high-speed self-motion. Except for the south gate, its self-walking speed is faster than any 1 star near the sun. At present, arcturus is almost at the closest position to the sun, and it is moving at a high speed, and its relative speed with the solar system is122km/s. arcturus is considered as an ancient galactic disk star, and it moves with 52 other stars of this type. The quality of arcturus is difficult to determine, but it may be similar to that of the sun and will not exceed the sun's 1.5. Arcturus is considered to be probably older than the sun, and the red giant stage that the sun will go through is probably the present situation of this star.

However, due to the limited hydrogen fuel of the planet itself, its life span is only a few thousand years, and then there will be a big explosion. After the explosion, the remaining material will shrink like Sirius's companion star and become a dim white dwarf.