UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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hotter & more luminous.
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hotter & less luminous.
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cooler & less luminous.
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cooler & more luminous.
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Detailed explanation-1: -Polaris Aa, the primary star, is more massive and several times bigger than our Sun. It has around 5.4 solar masses and a whopping 37.5 solar radii. Polaris Aa is slightly hotter than our Sun, having surface average temperatures of 6, 015 K. Polaris Aa is 1, 260 times more luminous than our Sun.
Detailed explanation-2: -Sirius is classified by astronomers as an “A” type star. That means it’s a much hotter star than our sun; its surface temperature is about 17, 000 degrees Fahrenheit (9, 400 Celsius) in contrast to our sun’s 10, 000 degrees F (5, 500 C).
Detailed explanation-3: -They have large radii than Sirius hence greater surface areas and higher luminosities. Sirius is a main sequence star but because it is hotter than the red main sequence Barnard’s Star it is much more luminous than it.
Detailed explanation-4: -Betelgeuse has a very high luminosity (40, 000 times brighter than our Sun), but its surface is cool (less than 4000 K).