Sirius introduction

One of the brightest star in the night sky is dramatically fading and scientist se that's because they could be about to explode. Astronomy keeps advancing and people in our modern age find about something new about space practically on the monthly basis. As a rule scientist concern themselves with objects located billions billions of kilometres away from our Earth. However, there are a lot of exciting things comparatively near the solar system. 


Now it's time to take a peep at a celestial object equally worthy of our attention Namely the brightest star in the sky Sirius. Most people perceive it as one single star. However in reality Sirius binary stellar system, consisting space object. Sirius A, and Sirius B, both stars orbit around their common centre at a distance of approximately 20 astronomical units. Just to compare this, this is only one astronomical unit more than the distance from Uranus to Sun. Their their orbital period around the gravity centre is 50 years. Sirius A is the main component. It is a visible star of Spectral type a1 which has long been perceived as they only star in the system. It is about to some masses with the radius exceeding that of the sun by 71%. Due to its close proximity Sirius is one of the easiest subject for amateur astronomers. The stars 8.6 light years away from our solar system and its brightness is 25 times as intense as that of the sun. In addition to its superiority over. Our main star in terms of its dimensions and mass this celestial object also beats it in the temperature level which may 9900 40 kelvin on its surface as opposed to only 5778 Kelvin on the sun. 


The most amazing thing is the high level of iron in its atmosphere, which is 316 % as abundant as on the sun also The spectrum shows that other elements heavier than helium were to be found. The star is likely to have been enriched in metallic elements, tens of millions of years ago by neighbouring object. Speaking about its future evolution, Sirius a will probably continue to exist as it is for another 600 million years or so after which it will turn into a red giant and then a white dwarf even though only 7000 white dwarfs are known to science today. This kind of final state is typical of stars relatively similar to our sun in the terms of dimensions and mass. These object hard to discover which has to do with our low luminosity and small diameter. However according their overall number in our galaxy is estimated to reach 10 millions that is about 5% of all stars in The milky way. The second component of sirius stellar system is exactly  one of the search object which is the first white dwarf to have been discovered. 

As far back as in 1844 the famous, scientist noticed that Sirius yah form time to time Deviates from its linear motion. He suggested that the existence hidden mass orbiting together with a star around a common centre. 

18 years later in January 1862 Vessel's assumption proved to be through while testing a new 46cm refector. American astronomer Alvin cited a tiny star near Sirius. It's orbital movement corresponded to friedrich Vessel's calculations. 

Star was dubbed Sirius B this object is the heaviest white dwarf of all known to science and has approximately the mass of the sun but even in spite of the indicator not typical celestial object variety its accounts for less than 1 million of that of the sun. Its dimensions are mystique well those of the earth before becoming a white Dwarf the skies likely to have completed the two basic stages of the star evolution. The main sequence stage and then red giant stage. Scientist believe that the process of turning into white dwarf took place approximately 120 million years ago and the stars mass used to be 5 times that of the sun at this moment Sirius B is barely luminous, with its luminosity being point out to 6 that of sun and with a exceptionally high temperature of 25000 Kelvin on its surface. 

Sirius B has no internal heat source. It will gradually cool off and will eventually  become hypothetical black Dwarf in over two billions years time. However this kind of objects has not been cited by scientists yet. Unlike its younger neighbour this star is not easily observable in our in our sky.