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What color are supergiant and giant stars?
They are just hotter and shine brighter. An old Blue-white star becomes a Supergiant. They expand, just like average-sized stars expand to become Giant stars. Because they are beginning to run out of hydrogen, they cool down and glow a more orangey color.
What color is a red supergiant?
Red supergiants look red because of their low surface temperatures. They range from about 3,500 – 4,500 Kelvin. According to Wien’s law, the color at which a star radiates most strongly is directly related to its surface temperature.
What colour do supergiant stars appear at night?
Hotter, younger stars are a bright white or blue in colour, whilst the colder, older stars range towards hues of orange and red. In addition red stars are usually bigger in size, as many of them swell, becoming red supergiant stars towards the end of their lives.
Is there a white supergiant star?
A rare type of extremely bright supergiant with surface temperature of around 10,000°K. Deneb, one of the brightest stars in the Milky Way, is a white supergiant; it has luminosity approximately 60,000 times that of the Sun.
Which star is a supergiant?
Rigel, the brightest star in the constellation Orion is a typical blue-white supergiant; Deneb is the brightest star in Cygnus, a white supergiant; Delta Cephei is the famous prototype Cepheid variable, a yellow supergiant; and Betelgeuse, Antares and UY Scuti are red supergiants.
Do blue supergiants become red supergiants?
Blue supergiants can turn into red supergiants and vice versa. When the star is smaller and more compact, its luminosity is contained over a smaller surface area and so its temperature is much hotter; this is the blue supergiant phase.
What is a blue giant star?
In astronomy, a blue giant is a hot star with a luminosity class of III (giant) or II (bright giant). The name blue giant is sometimes misapplied to other high-mass luminous stars, such as main-sequence stars, simply because they are large and hot.
Why are blue supergiants blue?
These stars have surface temperatures of between 20,000 – 50,000°C and appear blue in colour. They are termed ‘blue supergiants’ due to their appearance and the enormous amounts of energy that they can radiate. So much energy is created in the centres of these stars that they are always on the edge of catastrophe.
How are blue supergiants formed?
The blue compact supergiant was formed by the merger of two stars. Blue supergiants are hot, luminous stars. Red supergiants are the largest stars and can be between 200 and 800 times the radius of the sun, while blue supergiants are much smaller, usually less than 25 times the sun’s radius.
How is a blue supergiant formed?
What makes a blue supergiant?
When the star is smaller and more compact, its luminosity is contained over a smaller surface area and so its temperature is much hotter; this is the blue supergiant phase. These stars can then puff up expanding to a much larger size, spreading their luminosity over a much larger area.
Which stars become supergiants?
O type main-sequence stars and the most massive of the B type blue-white stars become supergiants. Due to their extreme masses, they have short lifespans, between 30 million years and a few hundred thousand years.
What color are the coolest stars?
Blue
What is the largest Blue Star?
The largest and hottest stars in the Universe are these blue giant stars. A familiar example is the blue giant star Rigel, located in the constellation of Orion, located about 700 to 900 light years away. Rigel contains 17 times the mass of the Sun, and shines with 40,000 times the luminosity of the Sun.
What is the color of the main sequence star?
The life cycle of Main Sequence stars is determined by their mass: High mass stars (stars with masses greater than three times the mass of the Sun) are the largest, hottest and brightest Main Sequence stars and blue, blue-white or white in colour.
What is a hyper giant star?
Hypergiant stars are the most massive and luminous stars known. Hypergiant stars comprise about 100-150 solar masses worth of material, approaching the Eddington limit , a theoretical upper limit of stellar mass, after which the star begins throwing off huge amounts of material due to its great radiation.