Physical Universe
15th Edition
ISBN: 9780077510534
Author: KRAUSKOPF
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 18, Problem 25MC
To determine
What is the common property of the stars belonging to the main sequence.
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There is a mass–luminosity relation because
a.
hydrogen fusion produces helium.
b.
stars expand when they become giants.
c.
stars support their weight by making energy.
d.
the helium flash occurs in degenerate matter.
e.
all stars on the main sequence have about the same radius.
The hydrogen lines in spectral type A stars
a.
are most narrow for supergiants.
b.
are most narrow for main-sequence stars.
c.
cannot be used to estimate the luminosity of the star.
d.
are very weak and difficult to see.
e.
are useful in determining the apparent magnitude of the star.
4. Suppose we observe a binary star system in which one star is much more massive than the other
and both are on the main sequence. We measure that the smaller star orbits the larger at a
distance of 10¹3 m with a speed of 10 m/s.
a. What is the mass of the larger star?
b. Which star has a higher luminosity?
c. Which has a larger radius?
d. Which is hotter?
Chapter 18 Solutions
Physical Universe
Ch. 18 - Prob. 1MCCh. 18 - Prob. 2MCCh. 18 - Prob. 3MCCh. 18 - Prob. 4MCCh. 18 - Prob. 5MCCh. 18 - Prob. 6MCCh. 18 - Prob. 7MCCh. 18 - Prob. 8MCCh. 18 - Prob. 9MCCh. 18 - Prob. 10MC
Ch. 18 - Prob. 11MCCh. 18 - Prob. 12MCCh. 18 - Prob. 13MCCh. 18 - Prob. 14MCCh. 18 - Prob. 15MCCh. 18 - Prob. 16MCCh. 18 - If we know both the luminosity and brightness of a...Ch. 18 - Prob. 18MCCh. 18 - Prob. 19MCCh. 18 - Prob. 20MCCh. 18 - Prob. 21MCCh. 18 - Prob. 22MCCh. 18 - Prob. 23MCCh. 18 - Prob. 24MCCh. 18 - Prob. 25MCCh. 18 - Prob. 26MCCh. 18 - Prob. 27MCCh. 18 - Prob. 28MCCh. 18 - Prob. 29MCCh. 18 - Prob. 30MCCh. 18 - Prob. 31MCCh. 18 - Prob. 32MCCh. 18 - Prob. 33MCCh. 18 - Prob. 34MCCh. 18 - Prob. 35MCCh. 18 - Prob. 36MCCh. 18 - Prob. 37MCCh. 18 - Prob. 38MCCh. 18 - Prob. 39MCCh. 18 - Black holes are remnants of a. stars with small...Ch. 18 - Prob. 1ECh. 18 - Prob. 2ECh. 18 - Prob. 3ECh. 18 - Prob. 4ECh. 18 - Prob. 5ECh. 18 - Prob. 6ECh. 18 - Prob. 7ECh. 18 - Prob. 8ECh. 18 - Prob. 9ECh. 18 - Prob. 10ECh. 18 - Prob. 11ECh. 18 - Prob. 12ECh. 18 - Prob. 13ECh. 18 - Prob. 14ECh. 18 - Prob. 15ECh. 18 - Prob. 16ECh. 18 - Prob. 17ECh. 18 - Prob. 18ECh. 18 - Prob. 19ECh. 18 - Prob. 20ECh. 18 - Prob. 21ECh. 18 - Prob. 22ECh. 18 - Prob. 23ECh. 18 - Prob. 24ECh. 18 - Prob. 25ECh. 18 - Prob. 26ECh. 18 - Prob. 27ECh. 18 - Prob. 28ECh. 18 - Prob. 29ECh. 18 - Prob. 30ECh. 18 - Prob. 31ECh. 18 - Prob. 32ECh. 18 - Prob. 33ECh. 18 - Prob. 34ECh. 18 - Prob. 35ECh. 18 - Prob. 36ECh. 18 - Prob. 37ECh. 18 - Prob. 38ECh. 18 - Prob. 39ECh. 18 - Prob. 40ECh. 18 - Prob. 41ECh. 18 - Prob. 42ECh. 18 - Prob. 43ECh. 18 - Prob. 44ECh. 18 - Prob. 45ECh. 18 - Prob. 46ECh. 18 - Prob. 47ECh. 18 - Prob. 48ECh. 18 - Prob. 49ECh. 18 - Prob. 50ECh. 18 - Prob. 51ECh. 18 - Prob. 52ECh. 18 - Prob. 53ECh. 18 - Prob. 54ECh. 18 - Prob. 55ECh. 18 - How large are black holes? Can any star evolve...Ch. 18 - Prob. 57ECh. 18 - Prob. 58E
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- The total mass of a binary system can be calculated from a. the ratio of the angular separation from the center of mass of each of the stars. b. the distance to the binary and its radial velocity. c. the semi major axis and period of the orbit. d. the radial velocities of the two stars. e. the time required for the small star to eclipse the larger star.arrow_forwardThe gas and dust cocoon surrounding young stars a. is blown away when the young stellar surface heats up and becomes more luminous. b. remains surrounding the young star throughout its adult life. c. eventually collapses onto the star, increasing its mass and luminosity. d. evaporates gradually over the lifetime of the star. e. expands as the star’s luminosity increases eventually reaching a distance far enough that it condenses to form comets.arrow_forwardA group of 10 to 100 stars that formed at the same time but are so widely scattered in space their mutual gravity cannot hold them together is called a. a globular cluster. b. an open cluster. c. an association. d. a spherical component e. an accretion disk.arrow_forward
- Stars are born in a. reflection nebulae. b. dense molecular clouds. c. HII regions. d. the intercloud medium. e. the local bubble.arrow_forward3. 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.?arrow_forwardAn eclipsing binary will a. be more luminous than a visual binary. b. always be a spectroscopic binary. c. give off most of its light in the infrared. d. show a constant Doppler shift in its spectral lines. e. show two stars with variable proper motion.arrow_forward
- The place on the H–R diagram where stars settle into the longest, most stable portion of their lifespan a. the horizontal branch. b. the instability strip. c. the birth line. d. the zero-age main sequence. e. none of the above.arrow_forwardWhen a mass is transferred through the inner Lagrangian point in a binary system toward a white dwarf, the material forms a rapidly growing whirlpool of material known as a(n) a. accretion disk. b. Lagrangian point. c. Algol paradox. d. planetary nebula. e. supernova remnant.arrow_forwardWhich 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_forward
- 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 →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_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_forward
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