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It's colour.

  • ≥ 33,000 K blue
  • 10,000--33,000 K blue to blue white
  • 7,500--10,000 K white to blue white
  • 6,000--7,500 K yellowish white
  • 5,200--6,000 K yellow
  • 3,700--5,200 K orange
  • ≤ 3,700 K red
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11y ago
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14y ago

Measure the color of the light coming from the star. Blue, yellow, red and white hot stars have different amounts of energy on their surface and ergo different temperatures. This is the principle of a no contact (infrared)thermometer.

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11y ago

Scientists can determine the surface temperature of a star by measuring its color. (To do this quantitatively, they commonly use three filters that transmit light in three different wavelength ranges. Then they take the ratio of the intensity of the light that gets through, say, the shortest wavelength filter to the intensity of the light that gets through the medium wavelength filter.)

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9y ago

Alioth, also known as Epsilon Ursae Majoris in the Bayer naming system, has a spectrum designated as A0, which means it is it a hot white star. Its distance is listed as 81 light-years. The surface temperature for A0 is 11,000 degrees K.

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11y ago

Your can tell the general temperate of a star, visibly, by noting its color.

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14y ago

Schedar (Alpha Cassiopeiae) is a K0 star and has a temperature of about 4,530 Kelvin

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14y ago

Because of the colour spectrum they emit.

Blue is hot whereas red is cooler.

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12y ago

colour.

red - cool

blue - very hot

think of heating a piece of metal, it goes from red to orange to white to blue the hotter it gets.

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13y ago

The color of a star can determine its temperature.

Red is the coolest.

Blue is the hottest.

Yellow is in the middle.

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12y ago

By its color.

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Q: What is the surface temperature of alioth the star?
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