Which is hotter the white star or the bluish-white star?

Answer 1

All stars have different temperatures, depending on their mass and period in their life cycle. The hotter a star is, the brighter it will appear.

The stellar classification [See link] in order of temperature. Our Sun is classed as yellow.

• Blue > 30,000 Kelvin
  
• Blue to blue white 10,000 - 30,000 Kelvin
  
• White 7,500 - 10,000 Kelvin
  
• Yellowish White 6,000 - 7,500 Kelvin
  
• Yellow 5,200 - 6,000 Kelvin
  
• Orange 3,700 - 5,200 Kelvin
• Red 1,000 - 3,700 Kelvin
• Brown < 1,000 Kelvin
  
• Black 0 Kelvin

See link [Kelvin] for conversion ratios.

These temperatures are the surface of the stars. The cores of the stars are much hotter, around 15 million degrees for our sun.
aprox. 5467,098 degrees

Answer 2

its intensity is lower than blue one

Answer 3

Your average star temperature is around a few thousand degrees Celsius. However, stars vary enormously, and they have a great range of temperatures. Depending on the type of star, its surface temperature can be as hot as one trillion degrees Celsius at one extreme and at the other extreme, in theory, a star can become nearly as cold as outer space.

It is also worth considering that a star's temperatures can vary depending on where on the surface, or how deep inside, of the star you measure. Starspots can locally lower the surface temperature of a star by thousands of degrees Celsius and the inside of a star is usually much hotter than its surface. For example, the average surface temperature of our local star, the Sun, is 5,500 degrees Celsius but some Sunspots can have a temperature much lower, at 2700 degrees Celsius. In the Sun's centre, its core, temperatures reach up to 15 million degrees Celsius.

Stellar flares can erupt away from a star's surface and these too can have temperatures much higher than that of the surface. Some flares on our Sun can reach 10 million degrees Celsius but they do cool down very quickly after they erupt.

The temperature of a star usually refers to its surface temperature as historically this was the first temperature reading to be measured. Early astronomers, using telescopes and prisms, were able to calculate the temperature of a star either by looking at the colour of the visible light emitted from the star's surface or by looking at the detail of the spectral lines in the starlight which by their presence, or not, reveal the temperature of the elements in the outer atmosphere of the star.

Generally, the hotter a star is, the brighter and bluer it will appear, and the colder the star is, the darker and redder it will appear.

The Types of Stars and their different temperatures:-

Main Sequence and Subgiant Stars-

• A red dwarf star can be 2,300-3,700 degrees Celsius. (Stellar class: M-type)
• An orange dwarf star can be 3,700-5,000 degrees Celsius. (Stellar class: K-type)
• A yellow dwarf star can be 5,000-5,800 degrees Celsius. (Stellar class: G-type)
• A yellow-white dwarf star can be 5,800-7,200 degrees Celsius. (Stellar class: F-type)
• A white (not dwarf) star can be 7,200-9,000 degrees Celsius. (Stellar class: A-type)
• A blue-white star can be 9,000-33,000 degrees Celsius. (Stellar class: B-type, or can be OB-type if >20,000 degrees Celsius)
• A blue star is hotter than 33,000 degrees Celsius. (Stellar class: O-type)

Giant and Supergiant Stars-

These stars have temperature ranges comparably similar to Main Sequence Stars, but typically a few hundred degrees Celsius colder due to their fuzzier and diffuser outer atmospheres. So, for example, an orange giant star can have a surface temperature between 3,300 and 4,600 degrees Celsius, about 400 degrees Celsius colder than the range for orange dwarf stars.

Other Stars-

• A brown dwarf star is normally cooler than 2,300 degrees Celsius. (Stellar class: L-type 1,300--2,300 Celsius, T-type 500-1,300 Celsius , Y-type ≤500 Celsius)
• A white dwarf star is much smaller than a white A-type star and usually 200,000 degrees Celsius or less. These stars cool with age.
• A black dwarf star is a very old, and very cooled down, white dwarf star with a temperature below -268 degrees Celsius. This is a theoretical star as it will only exist in the distant future. There are presently no black dwarf stars.
• A blue dwarf star is very small, much smaller than a blue main sequence O-type star. Blue dwarfs have temperatures above 3,700 degrees Celsius. No blue dwarf stars yet exist as they are made from very old red dwarf stars and the universe is not yet old enough.
• A neutron star can be, when very young, the hottest star of them all, starting out at an incredibly hot 1,000,000,000,000 (one thousand billion or one trillion) degrees Celsius but it does cool down very rapidly as it ages.

Answer 4

No, they jolly well aren't! It's their heat that makes them white.
Stars are enormous balls of gas that are continually exploding at the scale of millions of tons of TNT every minute. They are quite warm, even when white.
No, white stars are not cold. Technically, no stars can be 'cold,' some are just warmer than others. White stars are one of the hotter kind of stars.

Answer 5

red stars are less than 3,500 degrees Celsius and are the coolest among the stars.

Answer 6

These are the stars with a spectral classification of 'A'. They have surface temperatures between 7,600 and 10,000 kelvin.

Answer 7

No. Blue stars are the hottest.

Answer 8

Bluish-white