The Cosmic Perspective (9th Edition)
9th Edition
ISBN: 9780134874364
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 15, Problem 40EAP
To determine
To Discuss: The role of modern system of stellar classification in making rapid advances in the understanding of stars.
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Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e., B, AC, BCD...)
A) Neutral hydrogen lines dominate the spectrum for stars with temperatures around 10,000 K because a lot of the hydrogen is in the n=2 level.
B) Hydrogen lines are weak in type O-stars because most of it is completely ionized.
C) Oh Be A Fine Guy/Girl Kiss Me, is a mnemonic for remembering spectral classes.
D) The spectral sequence has recently been expanded to include L, T, and Y classes.
E) K-stars are dominated by lines from ionized helium because they are so hot.
F) The spectral types of stars arise primarily as a result of differences in temperature.
Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e., B, AC, BCD...)
A) K-stars are dominated by lines from ionized helium because they are so hot.
B) Oh Be A Fine Guy/Girl Kiss Me, is a mnemonic for remembering spectral classes.
C) The spectral sequence has recently been expanded to include L, T, and Y classes.
D) Hydrogen lines are weak in type O-stars because most of it is completely ionized.
E) Neutral hydrogen lines dominate the spectrum for stars with temperatures around 10,000 K because a lot of the hydrogen is in the n=2 level.
F) The spectral types of stars arise primarily as a result of differences in chemical composition.
Topic: Life Cycle of Stars
Q. Explain what changes occur in the temperature and size of a Sun-sized star as it goes through its life cycle?
Pls answer in 2-3 sentences. Thank You!
Chapter 15 Solutions
The Cosmic Perspective (9th Edition)
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- Stellar Classification and H-R Diagram Placement (40 points available). a. Where is your star located on the H-R diagram (luminosity class/region of the diagram, spectral class, luminosity/brightness)? How does this compare to that of The sun ? Discuss the inferences of the specific placement and stellar classification of your star with respect to mass, size/radius, color/temperature, composition? c. Discuss how this placement on the diagram relates to the star’s observed stage of evolution, previous evolution, and expected future evolutionary path. How does this compare to that of the Sun? d. What is the estimated total lifespan of your star and what is the estimated age of your star right now? How does this compare to that of the Sun? All of them is about Lutyen star .arrow_forwardBased on what you learned about stellar evolution, select all of the correct statements from the following list. 1. The period of some Cepheid variables actually changes. 2. When getting dimmer, variable stars are releasing energy; when getting brighter they are storing energy. 3. variable stars are expanding and contracting 4. despite their variability, variable stars stay in a specific position on the H-R diagram. 5. A changing period in a Cepheid variable means that the size of the star is changing and that the star is therefore evolving. 6. Only stars on the instability strip are variable. 7. More massive stars will vary their brightness more quickly.arrow_forwardLet’s say you’re looking for extrasolar planets. You observe a star that has a spectral shift in the line that is supposed to be at at 656.28011 nm – this star shows this line at 656.28005 nm. What is the radial velocity of star (in m/s) and in what direction in relation to you? a) 27.4 m/s, towards b) 27.4 km/s, away c) -27.4 m/s, toward d) -27.4 km/s, awayarrow_forward
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