1.Proxima Centauri (the closest star to the Sun) is a red Main Sequence star the

Question

1.Proxima Centauri (the closest star to the Sun) is a red Main Sequence star the same color as Antares. What can you say about the relative temperatures of Antares and Proxima Centauri? Explain.

2.Antares is a red star that is about 104 times more luminous as our Sun.The Sun's spectrum is most intense in green light (even though it doesn't look green to our eyes). What can you say about the size of Antares compared to the size of the Sun? Explain your reasoning.

3.The Sun and Vega are both Main Sequence stars and are roughly the same size. Vega's surface temperature (10,000K) is almost twice as hot as the Sun's (5,800K). Which star is more Luminous? Explain briefly.

4.The star y UMi in the Little Dipper has about the same surface temperature as Vega, but its luminosity 104 times the luminosity of the Sun. What can you say about the relatives sizes of y UMi and Vega? Explain.

Explanation / Answer

1.

Proxima Centauri is the nearest red dwarf. This star is even in red color we cannot see with naked eye because it is very dim. The temperature on Proxima Centauri is only 3000 Celsius. Antares is the large star it is 530 times greater than the Sun and one militant less density than the sun. Even it is so far from the Sun, it exhibits high temperature than the Proxima Centauri. The stars get shin and temperatures due diffusion of the hydrogen. The Antares exhibits greater diffusion than the Proxima Centauri. Hence, the Antares exhibits more diffusion and greater shining than the Proxima Centauri.

2.

Even the Sun’s spectrum most intense in green light it does not exhibit green because of the distance between the Sun and the Earth. Suppose, sky is in blue color because it is shorter distance us and exhibits blue color. The Sun is not larger than all the stars. It is an average star but it appears larger than the other stars because our Sun is very closer to us.

So many stars are bigger than the Sun as follows:

Mu Cephi – 700 times bigger than the Sun

Betelgeuse – 900 times bigger than the Sun

Antares - 530 times bigger than the Sun

Deneb – 145 times bigger than the Sun

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