Consider two different clusters with approximately the same turnoff luminosity. Cluster A has a main sequence 0.5 magnitudes bluer than cluster B. What property is different between clusters A and B? Explain the physical process that makes the stars of cluster A bluer.
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Consider two different clusters with approximately the same turnoff luminosity. Cluster A has a main sequence 0.5 magnitudes bluer than cluster B. What property is different between clusters A and B? Explain the physical process that makes the stars of cluster A bluer.
Given two clusters A and B on the H-R diagram (which is a plot between the luminosity and temperature with temperature increase on the left) with approximately the same turnoff luminosity.
And we know the turnoff luminosity is the point on the H-R diagram which indicates the point at which the main sequence star runs out of fuel.
It is stated that cluster A has a main sequence magnitude 0.5 magnitudes bluer than the cluster B.
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- A red giant star has a temperature of 3900 K and a luminosity of 13600 LSun. How many times bigger is this star than the Sun? Hint: You need the surface temperature of the sun for this problem. Use the value in the book, 5800K.Why are Cepheid variables important? O Cepheids variables are pulsating stars whose pulsation periods are directly related to their true luminosities. Therefore they can be used as distance indicators. O Cepheids variables are supermassive stars that are on the verge of becoming supernovae. Therefore they allow us to choose candidates to watch if we hope to observe a supernova. O Cepheid variables are stars that vary in brightness because they harbor a black hole. Therefore, they provide direct evidence for black holes. O Cepheids variables are a type of irregular galaxy, much more common in the early universe. Therefore they help to understand how galaxies formed.Can you please help with Part 2 of 2? Thank you.
- I need the answer as soon as possibleIf a neutron star has a radius of 15 km and a temperature of 7.5 x 106 K, how luminous is it? Express your answer in watts and also in solar luminosity units. (Hint: Use the relation Use 5,800 K for the surface temperature of the Sun. The luminosity of the Sun is 3.83 × 1026 w.) luminosity in watts luminosity in solar luminosity units LoIn the star clusters shown, which one is younger and why?
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- Question 41 .Suppose you are looking at H-R diagrams of two similar star clusters. The most luminous main sequence stars in the Porcini cluster are much more luminous than the most luminous main sequence stars in the Morel cluster. What can you conclude? O the Porcini cluster is younger than the Morel cluster O the Porcini cluster is farther away than the Morel cluster O the Porcini cluster is lower in metallicity than the Morel cluster O the Porcini cluster is larger in diameter than the Morel cluster(Answer don't copy with hand written please)As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 12 times that of the Sun, but a surface temperature 0.5 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is A = 4πr2.