The horizontal branch stars are giants fusing what element in their cores and then their shells? a. hydrogen b. helium c. carbon d. silicon
Q: Which of the following accurately describes why massive stars can no longer fuse elements at their…
A: It is asked, which of the following accurately describes why massive stars can no longer fuse…
Q: 2. Explain the different mechanisms that power the internal heating of a giant star, a main sequence…
A: Question : Explain the different mechanisms that power the internal heating of a…
Q: 1. The stellar parameter that best determines a star's location on the main sequence is: Select one:…
A: 1. The stellar parameter that best determines a star's location on the main sequence is: c. mass…
Q: 1. Using the observed (apparent magnitude) light curve for a Cepheid variable shown below, estimate…
A: Given is a plot between the apparent magnitude mV and the period in days plot So first from the…
Q: Two stars are in a closely orbiting binary system. The smaller star (a K-type main sequence star)…
A: The correct option. Following the mass transfer, which of the following is now true of the main…
Q: The last nuclear reaction in the core of massive stars that uses energy rather than producing energy…
A: When the Helium in the core of the massive stars exhausts, the evolution of stars is different from…
Q: A star is observed with a surface temperature of 3,000 K and a luminosity of 100,000 solar…
A: Given , Temperature = 3000 K Solar Luminosity = 100,000 Now , mass and luminosity are related by…
Q: The most luminous main-sequence stars are spectral class a. A. b. O. c. G. d. M.
A: Answer: b. O. O type stars are most luminous.
Q: What is the most reliable way to measure the mass of a star for which the distance is unknown? a.…
A:
Q: 75% P 100 kN 2.5 KN 37777
A: From the FBD of the block to the right. And solving for.
Q: 1. A helium flash a. is sudden and powerful. b. destroys the star. c. is a slow expulsion of helium…
A: A very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the…
Q: Trappist 1 a small red dwarf (M*=0.089) with R*=0.12, L*=0.000553 and T=2566. What in AU's is the…
A: The Stefan-Boltzmann law states that the luminosity of the star:L=4πR2σT4………(1)where,R is the radius…
Q: Giant and supergiant stars are 10 to 1,000 times larger in diameter than the sun and a. are half…
A: Given statement : "Giant and supergiant stars are 10 to 1,000 times larger in diameter than the…
Q: . How does the H-R digram of a given star cluster change as the cluster ages?
A: HR Diagram : Note : Blue color indicates the hottest stars and red color represent the…
Q: mass–luminosity relation
A: The Answer to the above statement can be outlined as follows:-
Q: What kind of star is most likely to become a white-dwarf supernova? A. a star like our Sun B. a…
A: There are gas and dust particles in outer space when their mass increases they will start attracting…
Q: Astronomers think of pulsars not as pulsing objects, but rather like a(n) a. Cepheid variable.…
A: A Cepheid variable is a class of stars, that varies in its apparent magnitude values over a period…
Q: A helium flash a. Is sudden and powerful. b. destroys the star. c. is a slow expulsion of helium…
A: A helium flash is a rapid explosive burning of helium gas in the deep core of low mass stars and the…
Q: Brown dwarfs are ____. a. stars with a very thick dust sphere around them, so they appear “brown”…
A: Required : Correct option.
Q: Type Ia Supernova is an example of a: a. Parallax object b. Moving cluster object c. Standard
A:
Q: All massive main sequence stars reside in clouds of glowing gas. The four powerful stars in the…
A: Stars form within dust clouds and are found across most galaxies. Deep within these clouds,…
Q: Consider two stars: one being a red giant with a spectral type K0 and one being a supergiant with a…
A: The intrinsic luminosity of a star is given by Stefan-Boltzmann's law as L=σAT4σ is the…
Q: Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…
A: 1. Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…
Q: Which of the following nuclear fuels does a one-solar-mass star use over the course of its entire…
A: Required : Elements formed in 1 solar mass star.
Q: Stars that contract the quickest to land on the zero-age main sequence on the H–R diagram a. are…
A: Zero Age Main Sequence (ZAMS) is the time when a star first joins the main sequence on the…
Q: Which of these is NOT used as a spiral tracer? a. O stars b. B stars c. young open clusters…
A: Spiral tracers are objects that are commonly found in spiral arms and soare used to trace spiral…
Q: Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?
A: Balmer series is a spectral emission line of the hydrogen that result electron transition from…
Q: Which main-sequence star would be the least luminous? a. G1 b. G5 c. G9 d. F0 e. F3
A: Given:Which main-sequence star would be the least luminous.Now, Main sequence stars (V) Spectral…
Q: . The spectrum of Star A peaks at 700 nm. The spectrum of Star B peaks at 470 nm. We know nothing…
A:
Q: A turnoff point corresponding to the oldest star cluster would occur at what spectral…
A: Turnoff point in HR diagram is the point where the star leaves the main sequence branch
Q: A helium flash occurs a. because helium is very explosive and cannot be controlled when the…
A: Required : Why does the helium flash occur.
Q: An explosive, although nondestructive, event on the surface of a white dwarf that is part of a…
A: d. nova
Q: A group of four stars, all the same size, have the four different surface temperatures given below.…
A: Temperature of star
Q: Which of the following spectral classes has stars with the hottest temperature? a. F0 b.…
A: Here given the stars with spectral classes.We have to find the stars which is hottest.
Q: A star with an original mass of 9MSun undergoes an active period where it experiences mass loss via…
A: Given data: Mass of the star, Mstar=9Msun Time, t=1.1 million years = 1.1×106 years New mass,…
Q: Objects in binary systems consist of a neutron star accumulating material from another star on its…
A: Answer:b) X-ray bursters. X-ray bursters are basically are one class of X-ray binary stars…
Q: Which of the following stars are bright and very cool
A: The Supergiants are cool stars, which are very large and really bright. they're located towards the…
Q: . Imagine a giant sphere with a radius of 1 AU surrounding the Sun. What is the surface area of this…
A: "Since you have posted a question with multiple sub-parts, we will solve the first three subparts…
Q: Star clusters are important to our study of stars because a. all stars formed in star clusters.…
A: A star cluster is a group of stars that share a common origin and are gravitationally bound for some…
Q: The place on the H–R diagram where contracting protostars first become visible is a. the…
A: The place on the H–R diagram where contracting protostars first become visible is the birth line.
Q: 4. What is the upper limit of a brown dwarf’s size? a. no upper limit b. 0.50 solar masses c. 0.10…
A: What is the upper limit of a brown dwarf’s size.
Q: Black holes are formed by A. collapsed dark nebulae. B. supernovae from binary stars. C. a lack of…
A: ASTRO PHYSICS
Q: How big is a white dwarf? A. the size of a football field B. the size of a city C. the size of the…
A:
| a. |
hydrogen
|
|
| b. |
helium
|
|
| c. |
carbon
|
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| d. |
silicon
|
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