Sirius A is also calledCanis MajorThe main star is used by peoplenaked eye5776 visiblefixed starThe brightest one,brightness- 1.46, 8.64 away from the earthLight year, brightness issunlight(sun).companionIt's aWhite dwarfIt was discovered in 1862.Sirius A has a diameter of 2512560 kilometers, which is about 1.78 times larger than the Sun.Companion nameSiriusB，diameter9655.8 km.Although it is about the same size as the Earth, it is as heavy as 350000 Earths.Perhaps, in 61000 AD, the apparent magnitude of Sirius will be - 1.67.
ArtistsSiriusImagination diagram of the system.Sirius A is the larger one.Sirius A is about 2.1 times the mass of the sun.Optical interferometerMeasure the radius of the star and estimateAngular diameter5.936 ± 0.016 mas.itsStellar rotationAt a slower speed of 16 kilometers per second, the star was not effectively flattened into a disk.
The celestial model indicates that Sirius A was formed onceMolecular cloudWhen it collapsed, 10 million years later, its energy generation has been completelynuclear fusionYes.Its core has becometroposphere, and utilizeCarbon nitrogen oxygen cycleCreate energy.It is predicted that Sirius A will exhaust the hydrogen stored in the core within one billion years (109) after its formation.It will experienceRed GiantStage, and then soften down to become aWhite dwarf。
Sirius A
The spectrum of Sirius A has deep metal lines, showing the enhancement of some elements heavier than helium (such as iron).Compared with the sun, the iron content of Sirius A's atmosphere relative to the hydrogen content is, also equal to 100.5, which means that the iron content in its atmosphere is 316% of the sun's.Not likely to be the whole onefixed starAre rich in metal elements, which may be suspended on the surfacetroposphereOn.
In 1909, Eichener Herzpoon was the first person to propose that Sirius wasMoving constellation Ursa MajorHe came to this conclusion after observing the path of Sirius system in the sky.ursa majormovecluster220fixed starComposed of and inSpaceThere are the same moving paths.It was originally formed asOpen clusterFrom then on, it gradually disengages from the traction of gravity.However, the analysis made in 2003 and 2005 shows that Sirius may not belong to this cluster.ursa majorMoving clusterThe estimated age is 400 to 600 million years, while Sirius'sAmount of metalIt is similar to the sun, so its age is only 200 million years, which is too young for this star cluster.Sirius may belong to a proposed "Sirius supercluster", and the open stars that may belong to this cluster areAurigaβ、Corona Borealis alpha、Grand Duchessβ、Eridanaβ andSerpentβ。thisclusterIt's 500 near the sunLight yearOne of the three star clusters within.The other two areNet Star clusters andPleiades, each with hundredsfixed star。
Sirius, created in the 1970s, is a work full of fantasy by Stockhausen. Its main feature is to combine electronic elements with traditional musical instruments and human voices to form a variety of strange sounds, so as to express the mystery and vastness of the universe.
In addition to electronic sound, the work also uses trumpetBass clarinet, soprano andBassThe trumpet player on the record is Marcus, the composer's son.The music consists of four parts:Cancer("Cancer"), Libra, Capricorn and Aries.
On the dim background of rumbling sound, sharp sounds from far to near constitute the beginning of Cancer.The bass makes an unusual sound, accompanied by the sound of smashing the ice and walking in the snow, followed by the sound of burning firewood on the trumpet. The strange singing of the soprano leads to the sound of water flow, accompanied by the sound of windBass clarinet, the male voice and female voice start a dialogue, and then enter a fantasy of the soprano lead singerA passage。……After all kinds of wonderful changes, it ends with the intermittent singing of soprano and bass.
"Libra" takes bass clarinet as the main instrument, trumpet and electronic sound as the background, soprano singing andBassThe position of the voice of "Li" basically intervenes between the two, so as to form a noisy effect in silence.“Capricornus”It is a crazy chapter. The bass and soprano sing freely, the trumpet and the bass clarinet form a stimulating sound, and the electronic sound forms a flash on the background.“Aries”There are mainly trumpet and soprano playing the leading role, and the bass is usually just an ornament on the background, and the electronic sound emits a sound like wavy current.
Through this work, which lasts nearly 100 minutes, people can integrate themselves into the universe, which is pregnant with life but cold, light but dark, in many unexpected sounds, and experience all kinds of wonders about the universe in the vast and lonely.
TheBass clarinetThe performer is Susanna Stevens, and the soprano is Annette Melvese,BassIt's Boris Calmily.
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The brightest star in the world:Sirius A, also known as Canis Major, is the brightest star among 5776 stars that can be seen with the naked eye. Its brightness is -1.46. It is 8.64 light years away from the earth, 26 times the brightness of the sun.(Guinness World Records)
