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The star that is hotter but less luminous than Polaris is Sirius B. While Sirius B has a surface temperature of around 25,000 K, significantly hotter than Polaris's approximately 6,000 K, it is a white dwarf and has much lower luminosity. Polaris, a supergiant star, shines brightly despite its cooler temperature due to its large size. Thus, Sirius B exemplifies the relationship between temperature and luminosity in stars.
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Explain how a red star can be more luminous than a bluish-white star?
A red star can be more luminous than a bluish-white star if it is larger in size and/or hotter in temperature. The luminosity of a star is determined by its size and temperature, with larger and hotter stars emitting more energy. Therefore, a red star that is larger and hotter than a bluish-white star can be more luminous.
What is another word for the North Star?
The name of the north star is Polaris. As the brightest star in the constellation of Ursa Minor it is also called alpha Ursae Minoris. It is actually a multiple star comprised of Polaris Aa, Polaris Ab and Polaris B.
What are all the names of Polaris?
Polaris and the North Star are the only two names I know.
What happens to the luminosity of stars in the main sequence as temperature decreases?
In the main sequence, as the temperature of a star decreases, its luminosity also decreases. This relationship is explained by the Stefan-Boltzmann Law, which states that a star's luminosity is proportional to the fourth power of its temperature. Therefore, cooler stars emit less energy and light compared to their hotter counterparts. As a result, lower temperature main sequence stars, such as red dwarfs, are significantly less luminous than hotter stars like blue giants.
Which star is hotter in an eclipsing binary system?
Generally the main star as this will have the most mass. However, temperature is not necessarily based on mass, so a secondary unit, could well be hotter but less massive.
Would the sun be more luminous if it were hotter?
Yes luminous actually for a star to get hotter.
Explain how a red star can be more luminous than a bluish-white star?
A red star can be more luminous than a bluish-white star if it is larger in size and/or hotter in temperature. The luminosity of a star is determined by its size and temperature, with larger and hotter stars emitting more energy. Therefore, a red star that is larger and hotter than a bluish-white star can be more luminous.
Is Mercury a star?
No. The definition of a star is "any of the large, self-luminous, heavenly bodies, as the sun, Polaris, etc." Mercury is a planet that orbits a star - our sun.
How can a cool star be more luminous than a hot star?
Luminosity is related to temperature and distance.A cool and thus less luminous star would be brighter than a more luminous star at a greater distance.Our Sun is a relatively cool star in comparison to say Rigel, but because it is closer it appears more luminous and brighter.
How do the blue star differ from the red star?
Blue stars are hotter, larger, and more luminous than red stars. They have shorter lifespans due to their high energy output. Red stars are cooler, smaller, and less luminous, and they have longer lifespans.
Why does Rigel shine as bright as Betelgeuse even though Rigel is much smaller than Betelgeuse?
Rigel appears as bright as Betelgeuse because it is hotter and more luminous, even though it is smaller. The luminosity of a star depends on both its temperature and size, so a hotter, more luminous star can shine as brightly as a larger, cooler star.
How much more luminous than the sun is the star Rigel?
Rigel is approximately 120,000 times more luminous than the Sun. It is a blue supergiant star, which is much larger and hotter than our Sun, resulting in its high luminosity.
Why one star may appear brighter than other star?
One star may appear brighter than another star due to several factors, including its size, temperature, distance from Earth, and luminosity. A larger, hotter, closer, or more luminous star will typically appear brighter in the night sky compared to a smaller, cooler, more distant, or less luminous star.
How is the star Polaris compared to that of the star Sirius?
Sirius is the brightest star...Polaris is bigger then Sirius, Polaris is 360 to 820 light years away from earth, and Sirius is only 8.6 light years away. The Sirius star is known as the dog constalation, The polaris star is found at the tip and corner of the big dipper and the little dipper
What is the kind of star polaris?
Polaris, also known as the North Star, is a supergiant star located in the constellation Ursa Minor. It is classified as a yellow supergiant (specifically, a type F7 Ib star) and is about 2,500 times more luminous than the Sun. Polaris is a variable star, specifically a Cepheid variable, which means its brightness changes periodically. Its position nearly aligns with the North Celestial Pole, making it a crucial reference point for navigation.
Where is Polaris in its life cycle?
The present star is in the late stages its life as Polaris. In the Roman Era, the North Pole was more or less equidistant from Kochab and the present Pole Star. In the year 3000, Alrai will be closer to the Celestial Pole and the present star will cease to be Polaris.
Is the north star a super giant star?
No, the North Star, also known as Polaris, is not a supergiant star; it is classified as a yellow supergiant. Specifically, it belongs to the spectral type F7 and is part of a binary system. While it is more luminous than our Sun and has a larger radius, it does not fall into the supergiant category, which typically includes stars much more massive than Polaris.
