Why must astronomers use infrared telescopes to observe the motions of stars around Sgr A*?
Q: Consider a disk with disk temperature T = T0(r/AU)−1 with T0 = 200K.and surface density given by Σ =…
A: The objective of this question is to find the difference between the orbital speed of the gas at 1…
Q: An astronomer is observing a binary star that is 15 pc away. The two stars have an orbital…
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Q: If interstellar dust makes an RR Lyrae variable star look 7 magnitudes fainter than the star should,…
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Q: If a prostellar disk is 260 au in radius and the disk plus the forming star together contain 7 solar…
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Q: What would most bright nebulae look like if there were no interstellar dust?
A: A nebula is defined as a large region of interstellar clouds made of dust, hydrogen, helium, and…
Q: How does a contracting protostar convert gravitational energy into thermal energy?
A: Stars are formed from clouds of gas present in the interstellar medium. Since the temperature is low…
Q: why must astronomers use infrared telescopes to observe the motions of stars around Sgr A*? The…
A: The star Sgr A* lies in the centre of the galaxy. The amount of dust and debris is relatively more…
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: What factors resist the contraction of a cloud of interstellar matter?
A: Interstellar matter is defined as the space between the stars' systems in the galaxy. It is made…
Q: If interstellar dust makes an RR Lyrae variable star look 2 magnitudes fainter than the star should,…
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Q: If a globular cluster contains 1 million stars and is 25 pc in diameter, what is the average…
A: The diameter of the globular cluster is d= 25 pc. Number of stars contain by the open clusters n= 1…
Q: If a contracting protostar is three times the radius of the Sun and has a temperature of only 3000 K…
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Q: Consider two stars, A and B, of equal size. You take a spectrum of each star and find that the flux…
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Q: If interstellar dust makes an RR Lyrae variable star look 5 magnitude fainter than the star should,…
A: Given the magnitude get fainter by 5. Therefore,
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: If a globular cluster contains 2 million stars and is 28 pc in diameter, what is the average…
A: This problem can be solved by first calculating the average volume reserved for one star and then…
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: If the hottest star in the Carina Nebula has a surface temperature of 51,000 K, at what wavelength…
A: Concept: "The Wien's displacement law states that the wavelength carrying maximum energy is…
Q: Observations show that the gas ejected from SN 1987A is moving at about 10,000 km/s. How long will…
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Q: 4) Why infrared is preferred to observe the stars around Sgr A*?
A: There are molecules of gas and dust in interstellar space. They are sent out when a star dies.…
Q: Why are the Hll regions around 0 stars generally larger than those around B stars?
A: HII region is the interstellar region where atomic hydrogen is ionized. It is a cloud of partially…
Q: If an open cluster contains 450 stars and is 21 pc in diameter, what is the average distance between…
A: Given Number of stars in an open cluster (n) = 450 Diameter of the cluster Dclu = 21 pc…
Q: If a globular cluster contains 2 million stars and is 30 pc in diameter, what is the average…
A: A Globular cluster is a cluster of old stars, only a few years younger than the Universe itself…
Q: If our Sun were surrounded by a cloud of gas, would this cloud be an emission nebula? Why or why…
A: Emission nebulae are formed in regions surrounding young stars. When a star is formed in the…
Q: An astronomer is observing a binary star that is 15 pc15 pc away. The two stars have an orbital…
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Q: If a contracting protostar is 0.5 times as luminous as the Sun and has a temperature of only 1,500…
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Q: The ring around SN 1987A (see the figures below) initially became illuminated when energetic photons…
A: To calculate how long after the supernova SN 1987A the ring became illuminated, we need to consider…
Q: Box 17-4 Suppose a star experiences an outburst in which its surface temperature doubles but its…
A: Firstly, let's use the formula for the volume of a sphere to determine the change in the star's…
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: What temperature would interstellar dust have to have to radiate most strongly at 100 micro meter?
A: When stars die they will slowly send out their outer layers. This forms large clouds of dust and is…
Q: A star orbiting Sagittarius A* is orbiting 970 AU from a 4 million MSun object. How fast (in km/s)…
A: The centripetal force is the force that keeps the planet or the star revolving around a central…
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…
Q: We observe a star that is dstar away. How much extinction would there need to be (i.e., what must…
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Q: The RR Lyrae stars in a globular cluster have apparent magnitudes of 14. Assuming an absolute visual…
A: Given that the apparent magnitude mv=14 and the absolute visual magnitude Mv=0.5, substituting…
Q: If a contracting protostar is two times the radius of the Sun and has a temperature of only 1890 K,…
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Q: If an open cluster contains 650 stars and is 27 pc in diameter, what is the average distance between…
A: Given, number of stars in cluster = 650 Diameter = 27 pc So volume of cluster = 43πD23 volume…
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- If an open cluster contains 350 stars and is 48 pc in diameter, what is the average distance between the stars? On average what, share of the volume of the cluster surrounds each star?why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared imageIf interstellar dust makes an RR Lyrae variable star look 7 magnitudes fainter than the star should, by how much will you over- or underestimate its distance? (Hint: Use the magnitude-distance formula d = 10 mv - Mv + 5)/5.) destimate dactual = Is your calculated value an over- or underestimate? O overestimate O underestimate
- if a protostellar disk is 260 au in radius and the disk plus the forming star together contain 7 solar masses what is the orbital speed at the outer edge of the disk in km per second. use the circular orbital velocity formulaThe 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.Imagine that the Earth is orbiting a white dwarf star, whose surface temperature is 20000 K. What is the apparent angular size of this white dwarf as viewed from Earth? (Express your answer in arcseconds)
- If a contracting protostar is five times the radius of the sun and has a temperature of only 2000 K, how luminous will it be?The answer is not 0.04. I need help!Why is it that stars of greater mass (and thus possess more fuel for nuclear fusion) spend less time on the main sequence of the H-R diagram than their lower mass counterparts?