s. What does it mean to have two stars with the same spectral type (e.g K3) but
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s. What does it mean to have two stars with the same spectral type (e.g K3) but different luminosity classes? What physical property distinguishes a K3V star from a K3l star? Stellar Evolution 9. List the stages that a Sun-like star will pass through after it leaves the main sequence. 10. How do protostars generate their luminosity? How do protostars change as they move toward the main 11. What two features are essential for a star to be on the Main Sequence? 12. Describe in broad terms how stars generate their energy after they leave the main sequence. What are the differences that appear in this process between low- and high-mass stars? 13. What kind of stars experiences a helium flash? Which types experience a supernova? 14. What happens in the core of a star during a core collapse supernova? I5. What is the evidence for black holes?Explanation / Answer
9. The sun passes through the stage of a mass of dust and gas which then collapsed due to a supernova event and the dense material got collected in the core due to gravitational pull and the rest got flattened and rotated as a disc. The dense mass in the core formed the sun like star and other planets
10. Protostar change their luminosity by increasing it's surface area than the last stage star it is going to form. A protostar has a greater surface area than the main sequence star it is forming, in this stage the nuclear fusion of two hydrogen atom is taking place in its core and forming a helium. The gravitational force is balanced by the force generated from nuclear fusion
11. a)A main sequence star has fusion of hydrogen in its core .
b) It has a balance of its outward gravitational force and the force gen by nuclear fusion
12. A star generate thermal energy in the dense core medium by the nuclear fusion of hydrogen atoms in its core. This happens upon condensation of mass in a main sequence star.
13. A low mass star experience helium flash and a high mass star with a mass equivalent to the dun or greater, experience supernova.
14. The core of the star collapses during a supernova event. This happens due to the large amount of gravitational force generated in the core due to the supernova event.
15. a. Detection of gravitational wave is an excellent evidence of black hole. Example- Detection of gravitational wave by LIGO collaboration in February 11 2016 detected a black hole in our galaxy
b. The presence of a black hole can be inferred from its interaction with matter and other components in the universe like visible light.
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