Astronomical knowledge about Cowherd and Vega

Vega is the constellation Lyra, and is referred to as Vega in Chinese folk and astronomical circles. It is the brightest star in the northern hemisphere after the great horn, and it is also the brightest early star in the northern hemisphere. Although it has been a standard star for photophotometry and MK spectral classification since 1953, many years of photometry studies have shown that it is a variable star, with blue and yellow light bands varying in amplitude and so on, but the problem of variable star classification and the law of light variation still need to be deepened**.

In addition, its radial velocity changes significantly. Although the spectral classification of Vega as A0V is earlier than that of Sirius, the effective surface temperature of 9,660K is lower than that of the latter at 9,970K, and the radius is slightly larger than that of typical A0V stars, indicating that the evolution of Vega seems to have left the initial main sequence. Soft X-rays from Vega have been discovered by exploration rockets and the High Energy Observatory 1 satellite, and a study published in 1979 showed that the luminosity of X-rays in kiloelectron volts is about Erg per second (the luminosity of the Sun in the same band is about less than Erg per second), which may indicate the presence of a corona on Vega.

Cowherd and Vega are two stars like the Sun, and they are also capable of emitting light on their own. The official Chinese name of the Cowherd Star is Hegu Er; It is combined with several other stars into a constellation called the constellation Aquila. The official Chinese name of Vega is Vega I; It and several other stars form a constellation called Lyra.

The names and divisions of the constellations were all imported from the West.

The Cowherd and Vega are far away from us! The Cowherd is 16 light-years and Vega is 27 light-years. The distance between them is also very far, 16 light years.

The scientific name of the Cowherd Star is the river drum two, and the river drum on both sides of it.

The first and third are the two children who were picked up by the legendary Cowherd when he chased the Weaver Girl in the sky. The scientific name of Vega is Vega One, also known as Lyra, and it is the brightest star in the constellation Lyra.

Vega and Cowherd are both stars. Vega is 50 times brighter than the Sun, and Cowherd is about 10 times brighter than the Sun. Vega is moving closer to the Sun at a rate of 14 kilometers per second, and Altair is also moving, approaching the Sun at 33 kilometers per second.

The luminosity of the Cowherd Star is twice that of the Sun, the diameter is 7 percent larger, and the mass is almost 7 percent larger. Vega is 60 times as luminous as the Sun, twice as large as the Sun, and almost 3 times as massive as the Sun.

From the perspective of the earth, the two stars are very close, but in fact, the distance between them will take 16 years, let alone meet on July 7.

From midsummer to early autumn, we will see three bright stars arranged in a triangle at the zenith in the first half of the night, among them, the west is Vega, the south is the Cowherd, and the other is Cygnus A, called Tianjin Four. This triangle is called the Summer Triangle, and it is a dazzling symbol in the summer starry sky as the red Antares in the south.

The Cowherd is in the constellation Aquila and Vega is in the constellation Lyra, two of the brighter stars in the Milky Way.

The Cowherd is on Aquila and Vega is on Lyra. You should know the story of the Cowherd and the Weaver Girl! I won't talk about it.