What is the most likely explanation for the dark area in the figure shown below? It is a region where there are no stars. It is a region with lots of dark matter. It is a supermassive black hole. It is a region with thick dust blocking the starlight coming from behind it. It is a dark star cluster.
Q: a. In which cluster(s) would you not expect to find a white dwarf? List all that apply. b. You…
A: for the white dwarf : If the star has a mass less than 1.44 of the sun's mass, it becomes a white…
Q: Which of the following is least reasonable regarding novae and supernovae? Group of answer choices…
A:
Q: 3) indicate which locations in the H-R diagram correspond to places where the evolution is slow.…
A: Using the H-R diagram shown the places where the evoultion has been slow is identified.
Q: What are the approximate spectral type, temperature, absolute magnitude number, and luminosity of…
A: Required : Spectral type, absolute magnitude, temperature and luminosity of star E.
Q: where do hydrogen-buring stars spend most of their time on the H-R Diagram? Is it the main sequence,…
A: Hydrogen burning stars are those stars which burns hydrogen as their dominant fuel. Horizontal…
Q: The Messier Catalog is a. a listing of all the stars within the Local Bubble b. a list of all the…
A: The Messier catalog is a list of 110 commonly found objects in the night sky that can be easily…
Q: Which of the following is least reasonable regarding a star's position on the HR diagram? Group of…
A: "White dwarfs are small and cool and are located in the lower left part of the HR diagram."This…
Q: At rest, hydrogen has a spectral line at 144 nm. If this line is observed at 168 nm for the star…
A: Given that Hydrogen has a spectral line at λ= 144 nm =10-9m This line is observed at λ'= 168 nm=10-9…
Q: What characterizes a star of spectral-type A in the visible part of the spectrum? Strong lines…
A: Spectral type A has wavelength ranging from 290-390 nm. They have very strong hydrogen lines.
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: True or False 8. Almost all stars are in binary systems. The book says: "So far you have been…
A: The statement: All stars are in binary systems. The book says: "So far you have been considering the…
Q: How is the turnoff point on the H-R diagram of a cluster related to the cluster’s age?
A: Given:- The turnoff point on the H-R diagram of a cluster related to the cluster’s age Explain:- How…
Q: Consider two different clusters with approximately the same turnoff luminosity. Cluster A has a main…
A: Given two clusters A and B on the H-R diagram (which is a plot between the luminosity and…
Q: White dwarfs have a temperature of 100×103 K. Calculate the maximum wavelength of a White dwarf.
A: A white dwarf is a stellar core remnant that is highly dense and made of electron-degenerate matter.…
Q: Globular clusters contain no stars more massive than the Sun. Which of the following seems like the…
A: First, we are aware that no stars more massive than the Sun can be found in globular clusters. Any…
Q: A planetary nebula is visible due to ____.
A: The nebula is the bright area in the sky, which can be cloud of stars or gas.
Q: What characteristics must a binary star have to be a good candidate for a black hole? Why is each of…
A: The characteristic must a binary star posses for it to be a good candidate for black hole is, From…
Q: Black Hole Accretion Disk. Part A: If the inner accretion disk around a black hole has a…
A:
Q: The density of a ________________ is greater than the density of a _________________. a. white…
A: A white dwarf is a stellar remnant of a star, which is formed after the star depletes the hydrogen…
Q: The figure below shows the spectra of two galaxies A and B.
A: 1. According to the figure Galaxy A has a high relative flux density which shows it has a dense…
Q: How large is our supermassive black hole in terms of the size of the Earth’s orbit? (Divide the…
A: The Schwarzschild equation for the radius of the event horizon around a black hole is given by the…
Q: Based on what you know about main-sequence stars, select all of the correct statements from the…
A: Required : Correct statements .
Q: In which component of the interstellar medium do new stars form? O molecular clouds O HII Intercloud…
A: Interstellar medium is the medium between matter and radiation. The matter are gases (gas cloud),…
Q: Why are interstellar lines so narrow?
A: Spectral lines are formed due to electrons making transitions between the energy levels inside the…
Q: The H-R diagram is the most important graph in astronomy. One of the reasons that this graph is so…
A: The H-R diagram is an important tool to study about stars and related information which we could…
Q: Based on what you learned about stellar evolution, select all of the correct statements from the…
A: 1. Correct: From the studies, it has been found that the period of some Cepheid variables actually…
Q: What are the on the axes of a Hertzsprung-Russell diagram? (b) Name one thing you can tell about a…
A: Hertzsprung-Russell Diagram plots the temperature of the start against their luminosity (or) colour…
Q: Astronomers us the P-Cygni line features in a spectrum of a supernova to... Select one alternative:…
A: Required : The correct option.
Q: Which of the following objects would you expect to be lacking any stars older than 10 billion years?…
A: which of the following objects would you expect to be lacking any stars older than 10 billion years.…
Q: Question 2: The integrated light from the Milky Way globular cluster NGC 104 has an apparent…
A: Step 1: Given: Apparent magnitude(mV) = 4.03 mag Absolute magnitude(MV) = -9.52 mag distance of NGC…
Q: Which of the following statements is wrong? A. A main-sequence star is cooler and brighter than it…
A:
Q: You observe two randomly chosen stars 10,000 lightyears from Earth. One is in the disk of the Milky…
A: In this question we have to observe two randomly chosen stars 10,000 lightyears from Earth. One is…
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- Give ALL correct answers referring to the properties of known stars, i.e., B, AC, BCD... A) On the main sequence, more massive stars are colder. B) High mass stars are the most numerous type of stars observed in the galaxy. C) Giants are colder than main sequence stars at the same luminosity. D) Giants are brighter than dwarfs at the same temperature. E) On the main sequence, more massive stars are dimmer. F) White dwarf stars are much denser than main sequence stars. Hint: White dwarf stars have about the mass of our sun, but are only the size of the Earth. Therefore, they have a very high density.A. Estimate the surface gravity of a neutron star with R = 10 km and M = 2M. . B. Determine the density of such a neutron star in g/cm³. C. How much would a teaspoon (5 cm³) of this neutron star weigh on Earth? This material is known as neutronium. Give your answer in pounds. D. Which would be heavier: a teaspoon of neutronium weighed on Earth, or a teaspoon of water weighed on the surface of a neutron star?The galactic corona is believed to contain mostly a. O and B stars. b. G, K, and M stars. c. open clusters. d. globular clusters. e. dark matter.
- How does a white dwarf differ from a neutron star? (Select all that apply.) A white dwarf is less massive than a neutron star. A neutron star is denser than a white dwarf .A neutron star is less massive than a white dwarf. A neutron star has a smaller radius than a white dwarf .A white dwarf is denser than a neutron star .A white dwarf has a smaller radius than a neutron star.List the following 5 terms in order through a stars life cycle (starting with the sun), through the remainder of its lifetime: a. Black dwarf b. Planetary nebula c. Red giant d. Star (Sun) e. White dwarfWhat happens to a white dwarf when a normal star dumps mass to a white dwarf? Group of answer choices The white dwarf get smaller, causing its temperature and density to decrease. The white dwarf get smaller, causing its temperature and density to increase. The white dwarf get larger, causing its temperature and density to decrease. The white dwarf get larger, causing its temperature and density to increase.
- Can you please help with Part 2 of 2? Thank you.Suppose a protostar has a luminosity of 39,473 L⊙ and a surface temperature of 4,130 K (Kelvins). What is the radius of this protostar? [Enter your answer as a multiple of the Sun's radius. I.e., if you find R = 20 R⊙ , enter 20. This problem is easier if you start with the relevant equation and create a ratio using the Sun's values. Recall that the Sun has a surface temperature of 5778 K. ]Identify the location in the H-R diagram of the phases of stellar evolution. (For each statement select the proper symbol in the picture.) 1) red giant, helium flash2) white dwarf3) red giant with helium burning shell4) hydrogen fusion in shell around core5) helium fusion in core6) envelope ejected, planetary nebula7) main-sequence star8) helium used up, core collapses9) hydrogen used up, core collapses
- Which of the following most correctly explains why we have not yet observed any white dwarfs derived from M stars: Group of answer choices Most M stars end up as neutron stars or black holes. The lifetime of M stars is longer than the age of the universe. Most M stars are located near the edge of the universe, beyond the visible horizon. Most M stars are members of a binary system, and the white dwarf would be obscured by the glare of the more massive companion. White dwarfs are too dim to be observed with currently available techniques.The figure above shows a track on the H-R diagram corresponding to the evolution of a star like the one you’ve just considered. Six stages are numbered. Six stages of stellar evolution are listed below – for each stage, write the number corresponding to its position on the diagram (four of these stages are the same stages you considered in the first part of this tutorial). Horizontal branch: Asymptotic giant branch: White dwarf: Main sequence: Planetary nebula: Red giant branch: What is the approximate mass of this star, in solar masses? Explain how you can tell.