21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 23.3, Problem 23.3CYU
To determine
The characteristic of the first stars formed in the universe which is not present in the stars formed today.
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Students have asked these similar questions
The diagram below shows an H-R diagram with life track of a 1-solar-mass star, with various stages labeled A through E.
Temperature
What will happen to the star after stage E?
A. It will gain mass until it collapses under its own weight.
B. It will begin burning carbon in its core.
C. It will explode in a supernova.
D. It will collapse to make a neutron star.
E. It will eject a planetary nebula.
Luminosity →
3. Brown dwarfs are ____. a. stars with a very thick dust sphere around them, so they appear “brown” b. low mass M type stars with hundreds of planets c. an anomaly because they are extremely small but have relatively high temperature d. protostars that could not ignite the fusion of hydrogen at their core e. has a surface temperature of 2500 K by fusing hydrogen
I asked this question onece already, but the answer I got said the answer was C because "AT 2700K THEY ARE HOT" or something to that effect. I tried to find a way to reply to that thread. My argument was that even if brown dwarfs were 2700k (and my book says that's closer to the temperature of red dwarfs and that brown dwarfs are usually around 1000K). Seeing that we are studying the life cycle and evolution of all stars, wouldn't either of those temperatures be on the relatively COOL side of all star temperatures? Wouldn't the most appropriate answer be D.?
Which of the following nuclear fuels does a one-solar-mass star use over the course of its entire evolution?
a.
hydrogen
b.
hydrogen and helium
c.
hydrogen, helium, and carbon
d.
hydrogen, helium, carbon, and neon
e.
hydrogen, helium, carbon, neon, and oxygen
Chapter 23 Solutions
21st Century Astronomy
Ch. 23.1 - Prob. 23.1CYUCh. 23.2 - Prob. 23.2CYUCh. 23.3 - Prob. 23.3CYUCh. 23.4 - Prob. 23.4CYUCh. 23 - Prob. 1QPCh. 23 - Prob. 2QPCh. 23 - Prob. 3QPCh. 23 - Prob. 4QPCh. 23 - Prob. 5QPCh. 23 - Prob. 6QP
Ch. 23 - Prob. 7QPCh. 23 - Prob. 8QPCh. 23 - Prob. 9QPCh. 23 - Prob. 10QPCh. 23 - Prob. 11QPCh. 23 - Prob. 12QPCh. 23 - Prob. 13QPCh. 23 - Prob. 14QPCh. 23 - Prob. 15QPCh. 23 - Prob. 16QPCh. 23 - Prob. 17QPCh. 23 - Prob. 18QPCh. 23 - Prob. 19QPCh. 23 - Prob. 20QPCh. 23 - Prob. 21QPCh. 23 - Prob. 22QPCh. 23 - Prob. 23QPCh. 23 - Prob. 24QPCh. 23 - Prob. 25QPCh. 23 - Prob. 26QPCh. 23 - Prob. 27QPCh. 23 - Prob. 28QPCh. 23 - Prob. 29QPCh. 23 - Prob. 30QPCh. 23 - Prob. 31QPCh. 23 - Prob. 32QPCh. 23 - Prob. 33QPCh. 23 - Prob. 36QPCh. 23 - Prob. 37QPCh. 23 - Prob. 38QPCh. 23 - Prob. 45QP
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- The chemical abundance of population I stars a. indicates that they were formed before the population II stars. b. indicates that the material they formed from had been enriched with material from supernovae. c. indicates that they contain very few heavy metals compared to halo stars. d. depends on the temperature of the star. e. depends on the mass of the star.arrow_forwardProtostar A. among the most massive and brightest stars Main Sequence B. a star after it has used all of its nuclear fuel Giant C. a gravitational field so strong that not even light can escape upergiant D. star in the longest stage of life (90% of stars) Neutron Star E. a super bright explosion of a star Black Hole F. created when a star loses its outer layers of gases White Dwarf G. extremely dense remnants of a dead star Black Dwarf H. young star in the early stages of formation jupernova 1. star that no longer gives off heat or light Planetary Nebula J. star that is larger and brighter than a main sequence star : A : E : Farrow_forwardWhich of the following statements about novae is not true? A. A nova involves fusion taking place on the surface of a white dwarf. B. A star system that undergoes a nova may have another nova sometime in the future. C. Our Sun will probably undergo at least one nova when it becomes a white dwarf about 5 billion years from now. D. When a star system undergoes a nova, it brightens considerably, but not as much as a star system undergoing a supernova. Is the answer C? Since the sun has no companion star, it cannot gain accreted matter to initiate a nova and so it would not undergo a nova, it would just undergo a type I supernova? Thanks!arrow_forward
- The triple-alpha process a. controls the pulsations in Cepheid variable stars. b. is the nuclear fusion of hydrogen to helium in massive stars. c. is the process that produces the neutrinos we receive from the sun. d. requires a temperature of about 5,000,000 K to operate. e. fuses helium nuclei to make carbon and occurs during helium flash.arrow_forwardThe next generation of stars that form from clouds containing material from stars that have undergone supernova explosions will be ______________________ than the present generation of stars. a. bigger b. smaller c. hotter d. more metal rich e. more metal poorarrow_forwardOnce carbon builds up in the Sun's core, astronomers expect our Sun to first become a red giant, then a .. Select one: A. neutron star B. red dwarf C. planetary nebula D. black hole E. pulsararrow_forward
- A helium flash occurs a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate electrons in the core do not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. under none of the above conditions.arrow_forwardAs a white dwarf cools, its radius will not change because a. pressure resulting from nuclear reactions in a shell just below the surface keeps it from collapsing. b. pressure does not depend on temperature for a white dwarf because the electrons are degenerate. c. pressure does not depend on temperature because the white dwarf is too hot. d. pressure does not depend on temperature because the star has exhausted all its nuclear fuels. e. material accreting onto it from a companion maintains a constant radius.arrow_forwardThe last nuclear reaction in the core of massive stars that uses energy rather than producing energy fuses what element? a. helium b. carbon c. silicon d. ironarrow_forward
- Which of the following is wrong? A. Tidal effects in a binary star system become more important when one or both stars become giant stars. B. There is no fusion occurring in the core of a low-mass red giant star. C. Gold (the element) is produced during the supernova explosions of high-mass stars. D. Suppose the star Betelgeuse were to become a supernova tomorrow, we'd see by naked eyes a cloud of gas expanding away from the position where Betelgeuse used to be. Over a period of a few weeks, this cloud would fill a large part of our sky.arrow_forward6) Supernova C is 10 times farther away than supernova D. The brightness of supernova C will be ________ times dimmer than that of supernova D. a. 100 times b. 1/10 times c. 1000 times d. 10 times e. 1/100th timesarrow_forwardPulsars CANNOT be spinning white dwarfs because a. white dwarfs are not that common. b. white dwarfs are not dense enough. c. white dwarfs do not have magnetic fields. d. a white dwarf spinning that fast would fly apart. e. all of the above are true.arrow_forward
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