why the middle star in the neck of the scorpious red?

Question

those who watch sky plz answer
among the three stars constituting the neck of the scorpious,the middle one shines red in colour.
is that called red shift?
if not can you explain the exact cause???

Answer 1

Anatres is a red giant.

The star is running out of it hydrogen fuel and starting to expand. The outter shells of the star are now huge maybe as large as the orbit of Mars. The little hydrogen that is being burnt quickly yet because the star is so large it is now cooling down.

A stars color tells up how hot is it buring, red stars burn cool and white stars are very hot. Yellow stars such as our sun are warm.

What will happen with Antares is once the star has burnt all it's hydrogen it will start to collapse and leave a ring of gas out in space. Once the all the hydrogen has been fused to hellium the star will start to fuse hellium into heavy metals. The immense amount of energy given off when this happens will turn the star white hot, yet t will be very small. We call it a white dwarf. The star will then cause the ring of gas it left behind after it collapsed to glow like a neon light bulb forming what we call a planetary nebula. As the star runs out of hellium to fuse it will slowly cool again turning into a brown dwarf and the quit burning all together.

Answer 2

ANTARES (Alpha Scorpii). A brilliant jewel set within the Milky Way, Antares guides us to one of the great constellations of the sky, the Zodiac's Scorpius (or Scorpio), the celestial scorpion, one of the few constellations that actually looks like what it represents. Antares, a class M (M1.5) red supergiant gleaming redly at the scorpion's heart, has a color similar to Mars. Since it is found within the Zodiac, which contains the apparent path of the Sun and planets, it is commonly mistaken for the red planet, a fact shown by its name, Antares, or "Ant-Ares," which means "like Mars," "Ares" being the Greek name for the god of war. This magnificent first magnitude (typically 0.96) star, shining opposite Betelgeuse, its counterpart in Orion, is ranked the 15th brightest in the sky. It is, however, a semi-regular variable that can change by several tenths of magnitude over a period of years. Its great distance of 600 light years reveals that it is truly luminous, to the eye over 10,000 times brighter than the Sun. Because it is cool, only about 3600 degrees Kelvin at its surface, it radiates a considerable amount of its light in the invisible infrared. When that is taken into account, the star becomes some 60,000 times brighter than the Sun. A low temperature coupled with high luminosity tells us that the star must be huge, luminosity and temperature giving a radius of about 3 Astronomical Units. It is so big that astronomers can easily detect and measure the size of its apparent disk, which gives an even bigger radius of 3.8 AU, three-fourths the size of the orbit of Jupiter The difference is caused by uncertainties in distance, temperature, and the actual location of the mass-losing surface, as the star is slowly evaporating under a fierce wind that has encased it in a gas cloud, or nebula, that shines by light scattered from the ultraluminous star within. Buried within the wind is a fifth magnitude (5.5) hot class B (B2.5) companion star (only 3 seconds of arc away) that hides within Antares' bright glare. The two are separated by roughly 550 AU and take perhaps 2500 years to orbit each other. The companion hollows out a small ionized region within the wind, and although blue-white, has the reputation of appearing green as a result of a contrast effect with its brilliant reddish mate. Antares, with a mass of 15 to 18 solar masses, probably does not have much time left to it. It is massive enough someday to develop an iron core and eventually to explode as a brilliant supernova. The event may be a million years off, an astronomical blink of an eye; or it may occur tonight, so keep a watch on one of the great stars of the nighttime sky. The companion, however, at around 7 to 8 solar masses, seems to be just below the supernova limit and will probably die as a massive white dwarf.

Answer 3

only about 3600 degrees Kelvin at its surface, it radiates a considerable amount of its light in the invisible infrared. When that is taken into account, the star becomes some 60,000 times brighter than the Sun. A low temperature coupled with high luminosity tells us that the star must be huge, luminosity and temperature giving a radius of about 3 Astronomical Units. It is so big that astronomers can easily detect and measure the size of its apparent disk, which gives an even bigger radius of 3.8 AU, three-fourths the size of the orbit of Jupiter The difference is caused by uncertainties in distance, temperature, and the actual location of the mass-losing surface, as the star is slowly evaporating under

Answer 4

Scorpio's red star .. named Antarez is red because it is a red supergiant . Red giants are stars that are near the end of thier life .

Antares, marking the Scorpion's heart, is a red supergiant and the brightest star in Scorpio. The name Antares means "Rival of Ares," or "Rival of Mars,"


Red Shift means .. An increase in the wavelength of radiation emitted by a celestial body.
It has nothing to do with the redness of a star .

A red giant is red because its exterior cooled from 9000 to 3000 degrees Fahrenheit as it expanded; for a star, red means cool.
When you see blue or white stars ..they are hot stars .
When you see red stars .. they are cooler stars.

Answer 5

To be more precise, Antares is spectral class M1.5 Ib. That means it is a red supergiant.

The red color is because the surface temperature is cooler than most stars. Star color is strictly a function of the surface temperature.

The reason a star will appear very bright will be because it is either very hot (like Deneb), very close (like Alpha Centauri) or very big (like Betelguise). In this case, Antares is very big.

Answer 6

Antares is a "red giant."

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