What are Double Stars and Clusters? What is Juxing?

A star system in which two stars are close to each other and orbit each other is called a binary star. The two substars in the binary star system often have different shades of 0 degrees and colors, just like pearls in the sea of stars.

There are many types of double stars. Some of them are stars moving around another star and have a gravitational relationship with each other, which is called a physical binary; Some binary stars are only projectional, which seem to be very close, but in fact they are far apart and have no physical connection, which is called optical binary stars. A binary star system that can only be seen through an astronomical telescope is called a visual binary star; Binary star systems that can only be resolved by analyzing changes in spectral lines are called spectroscopic binary stars.

In the stellar world, binary stars are a common phenomenon and are groups of stars of small cells. In addition, there is another star that moves around another star, and then there is a third star that moves around it, which we call a triad. If there is another participant, it is called a quadruple 、......Or known as Gathering Stars.

Among the stars in the Milky Way, binary or more complex clusters account for a large proportion, accounting for more than half. In 17 light-years around the Sun, there are a total of 60 stars, of which 32 are single stars, 11 pairs of binary stars (22), and two groups of triple stars (6).

Most of the stars in the universe don't exist alone, they tend to be binary or clustered stars that are born at the same time and are gravitationally held together.

Physically connected binary stars are basically born from a nebula at the same time, gravitationally connected and revolving around a common center of mass. The situation is similar to the Earth revolving around the Sun, except that instead of the Earth, it is another star. Of course, there are also binary stars that are not physically connected, they only coincide in the direction of the line of sight, which can be distinguished by spectral observations.

The situation of multi-star systems is more complex, and the gravitational pull between them is more complex.

The famous double star (eclipse double star): Daling Five. When the companion star moves in front of the main star, it weakens the luminosity.

Categories: Education, Science, >> Science & Technology.

Problem description: What do you think?

Analysis: If we use a telescope to observe the starry sky, we can often see some stars leaning together in pairs. Of course, a lot of this is just the result of perspective, and in fact the two stars are far apart, just in the same direction of sight.

However, astronomers have found that in a significant proportion, there is a strong connection between the two stars, orbiting each other. These two stars are called binary stars.

The two stars that make up a binary star are called the children of the binary star. The brighter of them is called the main star; The fainter one, called the companion star. The brightness of the host star and the companion star are not much different, and some are very different.

There are many binary stars, so close to each other that even the largest modern telescopes cannot distinguish their two substars. However, astronomers can find that they are composed of two stars. Such a double star is called a spectroscopic double star.

Therefore, the double star mentioned above can be distinguished by a telescope, which is correspondingly called a visual double star.

Some binary stars will have a phenomenon similar to a solar eclipse when they orbit each other, so that the brightness of such binary stars changes periodically. Such a double star is called an eclipse binary star or eclipse variable star. Eclipse binaries are generally spectroscopic binaries.

There are also binary stars that are not only very close to each other, but also have matter flowing from one substar to another, such binary stars are called close binary stars. Some are close to binary stars, and when matter flows, they emit X-rays, which are called X-ray binary stars.

In the Milky Way, the number of double stars is very high, estimated to be no less than a single star. The study of binary stars is not only of great significance for understanding the diversity of star formation and evolution processes, but also for understanding the formation and evolution of the Milky Way.

Gather three stars.

Six or seven stars are gravitationally clustered together, and the resulting star system is called a cluster. A system of three stars can also be called a triple star, a system of four stars is called a quadruple star, and so on.

The Kaiyang star in the constellation Ursa Major is a well-known conglomerate. First of all, it is a visual double star that can be distinguished by the naked eye. The main planet, Ursa Major Z, is a 2nd magnitude star; The companion star of Ursa Major 80 is a 4th magnitude star, 11 arc minutes away from Z Ursa Major (1 arc minute is 1 60th of a degree on the circumference).

Multi-year model observations have shown a strong chemical connection between the two stars. Observing Z Ursa Major with a telescope, you can see that it is a visual binary star, with two substars 14 arc seconds apart (1 arc second is 1/60th of 1 arc minute), the main star Z1 magnitude Ursa Major, and the first slow companion star Z2 Ursa Major magnitude. Z1 in the constellation Ursa Major is the first spectroscopic binary star to be discovered.

The companion star of Z1 Ursa Major orbits the host star in the sky and is only about one-third the distance from the Earth to the Sun. Later, it was discovered that Z2 and 80 Ursa Major were also spectroscopic binary stars. So, this condensed star is a sextile star.

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Interpretation of the stars.

Several stars clustered in groups and have a strong connection is called a cluster.

Word decomposition Explanation of poly poly ù rendezvous, set: aggregation. Party.

Accumulate. Gather. Gatherings.

Gathered. Gathered. Dinner.

Together. Birds of a feather flock together. Coacervation.

Gather sand into a tower. Loose radical : ear; Explanation of stars Star ī astronomy, refers to a celestial body in the universe that emits light or reflects light; Generally refers to luminous celestial bodies in the sky at night:

Heavenly body. Fixed star. Row (妌) star.

Satellite. Wear the stars and the moon. Finely chopped small particles of stuff :

Mars. The point on the scale and other scales: the fixed star.

Insignia on the officer's collar: five stars.

Those stars that have only one star when viewed with the naked eye, but two stars that are very close together when viewed with an instrument are called binary stars. A conjugation is a star that appears to be one star to the naked eye, but is actually a group of more than two stars together.

In addition to the double stars, there are 3 in the sky; When 4 or even 10 or so stars come together, they are called polystars. The number of double stars and conglomerates is very large. For example, there are about 100 stars within 20 light-years of the Sun, and they can belong to 72 binary and concentrating star systems, respectively.

Some of them are two, and there are also "quadruple stars" of as many as four. It is estimated that binary and concentrating stars account for about 1 3 of the total number of stars, which shows that this situation is very common. The Polaris, South Gate 2, and Da Ridge 5 that we are familiar with are all triple stars.

North River 2 in Gemini has 3 stars, and each of them is a spectroscopic binary, so it is a sex. The above-mentioned Kaiyang star contains more stars: one is a spectroscopic binary, one is a triple star, plus the auxiliary star itself is also a spectroscopic binary, so there are 7 stars in total.

The inhabitants of the earth can only see one sun. If we go sightseeing in a binary star system, we will definitely feast our eyes. If you can take a spaceship to the nearest South Gate 2 and stay there for a few days, you will see a wonderful view of the sky

As soon as dawn broke, an orange-red "sun" rose, and everything was illuminated red. After a while, another brighter "sun" rose on the line. It looks so similar to our sun, the color and brightness are almost the same, just a little bigger.

These two "suns" compete with each other in the sky, and each shines brightly. At night you may be able to see Proxima Centauri, but you won't be able to see it on Earth because it is magnitude 11. But here, it's as bright as a 4th magnitude star.

Even though it's not very bright yet, it will still catch your attention, because it will sometimes suddenly light up so fast that you can be surprised, and after dozens of minutes, it will suddenly return to its original ......Look at how wonderful the view from the sky is!

I would like to ask the landlord, are you asking about the web page?

If yes, then I know.

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Gathering Stars is a way to open it through free channels.