A Nova Explosion will be visible.

On a dark night you can see many stars, you can even count them, but it would be very boring, there are too many of them and it seems incredible that they all already have a name or at least a number, but this was not always the case, the ancient astrologers spent the nights observing the sky and drawing the position of the stars in the dark, without internet or electricity, so they gave them names, grouped them into constellations and learned to differentiate them.

From time to time these ancient astronomers saw a star appear out of nowhere, imagine one night you go out to draw the stars and you realize that there is a little star there where there was nothing before, a star that was not there and suddenly appears. what would you call it? the most obvious, “new star.”

The astronomer who discovered the first was Tycho Brahe, who was a prominent astronomer of the time. When he was 20 years old, he was already having his drinks at a party. He started arguing with a friend of his about who was the best mathematician and everything got out of control. They ended up challenging him to a duel with swords, Tycho lost his nose, and from then on he would wear a brass nose, and for special occasions a gold and silver one, in the end, he reconciled with his friend and they remained as always despite horrible accident.

On a calmer night in 1572 Tycho saw a star brighter than Venus, which was not there before, so he drew where it was in relation to the other stars of the constellation Cassiopeia, and called it in Latin “Nova stella” which means new star, and published a book about it, the brightness of this new star dimmed during the following months until it disappeared again, at present with powerful telescopes you can still see the remains of the explosion.

I announce to you that between now and September we can repeat Tycho's experience and see a Nova, a new star appear in the sky called T Corona borealis, and it is called that, because there are normal stars and variable stars, that is, their brightness changes sometimes more intense and sometimes less. Normal stars, apart from a famous name they have such as Sirius, Vega or Polaris, are assigned a Greek letter and then the name of your constellation.

The brightest star in each constellation is given the letter Alpha, the second brightest star is Beta, Gamma, Delta and so on, for example, Alpha Centauri, is Alpha because it is the brightest star in the Centaur constellation. , although in reality they are three stars very close together but when we did not have telescopes we did not know that, but variable stars are not given a Greek letter, they are given a Latin one, which is the alphabet we use and not in order of brightness because it is variable, but in the order in which they were discovered, it begins with the letter r, (I don't know why) In other words, t Corona borealis would be the third variable star that was discovered in the constellation of the corona borealis, although it is complicated because there are exceptions, for example if a variable star already had its Greek letter, as is the case of Betel Geuse which had Alpha because most of the time it is the brightest star in the Orion constellation, it is no longer assigned A Latin letter stays with its Greek letter and is Alpha Orionis, even though sometimes it is the brightest star and sometimes not.

T Corona borealis are actually two stars that are too close together for their own good, they orbit each other very close to each other and for this reason it is called a binary system, they are located at a distance of 3,000 light years from us and as their name suggests. He says, they are in the constellation of the Corona Borealis dominated by some U-shaped stars, which if you use a lot of imagination will look like a crown, honestly I don't see it, imagining shapes in the stars will be a valid form of entertainment.

And this star “will appear” because this binary system has two stars, one is a red giant star that compared to our sun is 75 times larger in diameter and 655 times more luminous, but being 3,000 light years away it is too small. and faint to attract attention, in fact, it cannot be seen with the naked eye, to see it you need at least a small telescope and the other star, its companion star, is tiny, it is a white dwarf star that is the size of the Earth , but don't be fooled by its size because despite being so small, it has the mass of our sun, 1.37 solar masses to be exact.

Imagine the mass of our sun, which is immense, compressed into a ball the size of the Earth, it shines with 100 times the intensity of our sun, such density also means that it has a lot of gravity and as I mentioned, these two stars are too close for you. own good; The Red Giant, which is the complete opposite of its companion, also has a mass similar to that of the sun, 1.12 solar masses but expanded into an enormous volume, it has the density of cotton candy, well, not so much, but yes, it is very not very dense. .

Its material is so loose that its white dwarf companion with its powerful gravity steals its material, which takes the shape of a disk before falling on the surface of the White dwarf. It is called an accretion disk and the material forms an ocean of hydrogen in the small star that increases its mass and therefore its density and temperature and when the hydrogen on its surface reaches 15 million degrees it begins the fusion chain reaction.

Hydrogen atoms fuse with each other producing increasingly heavier elements and each time this happens an enormous amount of energy is released in the form of heat, light and ionizing radiation, it will look like the brightest star in its constellation for a few days. , take advantage of this opportunity.

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