Match the spectral type and luminosity class to the letters shown on the Hertzsprung-Russell diagram 1) A WD (White Dwarf) 2) G V (Main Sequence) 3) M V (Main Sequence) 4) M I (Supergiant) 5) G III (Giant)
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Match the spectral type and luminosity class to the
letters shown on the Hertzsprung-Russell diagram
1) A WD (White Dwarf)
2) G V (Main Sequence)
3) M V (Main Sequence)
4) M I (Supergiant)
5) G III (Giant)
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- Sn1604 a supernova in the year 2000 the age then was 396 years calculate the speed of expansion of the sn1604 Kepler’s supernova assuming it has expanded at a constant speed throughout its lifetimeWhat is the size of a typical white dwarf? Group of answer choices 1.0 solar radii 0.5 solar radii 0.1 solar radii (roughly the size of Jupiter) 0.01 solar radii (roughly the size of Earth) 5 solar radiiIndicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF). A) White dwarfs are small dense objects about the size of the Earth. B) White dwarfs are composed mostly of hydrogen. C) A planetary nebula forms when a star violently explodes. D) A planetary nebula is the remnant of the outer envelope of a star. E) A white dwarf is the remnant of the star's core visible after the outer layers have been ejected.
- QUESTION 16 Use the figure shown below to complete the following statement: A low-mass protostar (0.5 to 8M the mass compared to our sun) remains roughly constant in decreases in until it makes a turn towards the main sequence, as it follows its evolutionary track. Protostars of different masses follow diferent paths on their way to the main sequence. 107 Luminosity (L) 10 105 10 107 10² 101 1 10-1 10-2 10-3 Spectral type 0.01 R 0.001 Re 60 M MAIN SEQUENCE 40,000 30,000 20 Mau 10 Mgun 5 Mun 0.1 Run Ren radius; temperature luminosity; radius 3 Min. 05 BO temperature; luminosity Oluminosity: temperature radius: luminosity 1 M 10,000 6000 Surlace temperature (K) 1,000 Rs 2 M STAR L 0.8 M B5 AO FOGO КБ МБ -10 +10 3000 Absolute visual magnitude andIn which component of the interstellar medium do new stars form? O molecular clouds O HII intercloud medium OHI clouds OHI and molecular clouds O hot coronal gasdescribing the various stages in the life of a 1.0 solar mass star, 0.5 solar mass star, and a 3.0 solar mass star
- What are the on the axes of a Hertzsprung-Russell diagram? (b) Name one thing you can tell about a star from its location in an H-R diagram (Other than luminosity & temperature!) c) Where are most stars located in the diagram?Choose the correct statements from the following list referring to white dwarfs. (Give ALL correct answers, i.e. B, AB, BCD...) A) Stars with a mass like the Sun will end up as a white dwarf star. B) White dwarfs with mass greater than 1.4 times the Sun's mass cannot exist. C) White dwarfs are less dense than red giants. D) The pressure that balances gravity in a white dwarf is called degenerate electron pressure. E) White dwarfs cool slowly because they are small and eventually fade-out to become black dwarfs. F) The power source of white dwarfs is left-over heat. G) White dwarfs are the coolest main sequence stars.Place the following events in the formation of stars in the proper chronological sequence, with the oldest first and the youngest last. w. the gas and dust in the nebula flatten to a disk shape due to gravity and a steadily increasing rate of angular rotation x. a star emerges when the mass is great enough and the temperature is high enough to trigger thermonuclear fusion in the core y. the rotation of the nebular cloud increases as gas and dust concentrates by gravity within the growing protostar in the center z. some force, perhaps from a nearby supernova, imparts a rotation to a nebular cloud y, then z, then w, then x z, then y, then w, then x w, then y, then z, then x z, then x, then w, then y x, then z, then y, then w MacBook Air on .H. O O O O
- Zebulon is a binary star system composed of a 10 M sun main sequence star and a 1 M sun red giant. Is this strange? yes or no. explain the reasoning.What are the two possibilities for the final state of a close, massive binary system?Calculate the mass of a star having a diameter of 6E5 km and an average density of 1.1 g/cm3