If an open cluster contains 650 stars and is 27 pc in diameter, what is the average distance between the stars? (Hint: On average, what share of the volume of the cluster surrounds each star?)

Q: Star A and Star B are both on the main sequence. Star A is 74 times more luminous than Star B. What…

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Q: If the RR Lyrae stars in a globular cluster have average apparent magnitudes of +19, how far away…

A: According to distance magnitude relation, d=10mv-Mv+55mv=apparent magnitudeMv=absolute magnituded is…

Q: if the stars at the turnoff point in a star cluster have masses of about 9 M⊙, how old is the…

A: Mass of the star at the turn off point is  9 times of mass of the sun.

Q: In a binary star system, the average separation between the stars is 4.0 AU, and their 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: Effective Temperature (K) 25,000 10,000 -10 6,000 3,000 10 102 A +10- D 10-2 +15 B A 104 M F…

A: The Hertzsprung Russell diagram is used to plot the temperature of stars with their luminosity.…

Q: If an X-ray binary consists of a 17-solar-mass star and a neutron star orbiting each other every…

A: The expression for the Kepler’s third law is as follows: MA+MB=a3p2                               1

Q: If a contracting protostar is seven times the radius of the Sun and has a temperature of only 2030…

A: The luminosity (L) of the contracting protostar relative to the sun be defined as, LL⊙=RR⊙2TT⊙4…

Q: If you assume that a globular cluster 2 arc minutes in diameter is actually 27 pc in diameter, how…

A: The expression for the distance from small angle formula, Angular diameter206265=linear…

Q: All of the single red-dwarf stars that ever formed are still on the main sequence today. (T/F)

A: Main sequence stars are those which are fusing hydrogen to helium in their cores. Almost 90% of the…

Q: If the main-sequence mass lower limit is 0.08 solar mass and the brightest main-sequence stars are 1…

A: The Main Sequence Stars are a mass sequence, with low mass stars forming an equilibrium with a cool…

Q: If a giant molecular floyd is 73 pc in diameter and a shock wave can sweep through it in 9 million…

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Q: For a main sequence star with luminosity L, how many kilograms of hydrogen is being converted into…

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Q: A star is transited by a planet. From the measured period T and the transit duration t alone, show…

A: From Kepler’s law,

Q: An astronomical image shows two objects that have the same apparent magnitude, i.e., the same…

A: Let the luminosity of the star is Ls= LoLuminosity of  Milky Way galaxy, Lm=1011LoLuminosity of…

Q: What critical event must occur in order for a protostar to become a star?

A: A very young star that is yet gathering mass from the parent molecular cloud is called a protostar.…

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: At the average density of a star-forming molecular cloud, about 900 atoms per cm3, determine how…

A: Given:- M=2 times 1030 kg density=900 atoms/cm3= 1.51 times 10-18 kg/m3 Find radius of the sphere…

Q: Assuming that at the end of the He burning phase of the stellar core (r R_core). Calculate the…

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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: This star has a mass of 3.3 MSun.  what is the main sequence lifetime of this star? You may assume…

A: Given data: Mass of the star MStar=3.3 MSun. The life time of the main sequence star is given as,…

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: The star Firefly is located 3.0 pc away. If it had an absolute magnitude of 13.0, which value below…

A: Formula for absolute magnitude is, Mv=m-2.5log(d10)2 Where, Mv = absolute magnitude m = apparent…

Q: Why massive stars are short lived?

A: A massive star has a shorter life spanthan an average star because of fasterhydrogen fuel…

Q: What is the escape velocity (in km/s) from the surface of a 1.5 M neutron star? From a 3.0 M neutron…

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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 contracting protostar is 0.5 times as luminous as the Sun and has a temperature of only 1,500…

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Q: At the average density of of a star-forming molecular cloud, about 1180 atoms per cm3, determine how…

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Q: you assume that a globular cluster 4 arc minutes in diameter is actually 27 pc in diameter, how far…

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Q: We will take a moment tổ compare ROw BrigriLIy a Wiite uwan stal sines Compdleu 10 a leu glant 3lai.…

A: Given: Tw=10,000 KTR=5,000 KRw=1100RsunRR=100Rsun we have to find ratio of Luminosity: LRLw=?

Q: If a T Tauri star is the same temperature as the Sun but is eighteen times more luminous, what is…

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Q: The flux received at the Earth from Supernova 1885 was 3.0182 x 10 10 W/m?. The luminosity of the…

A: flux (I) = 3.0182×10-10 Wm2luminosity = 6×109 solar luminosities

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: 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: Place the following events in the formation of stars in the proper chronological sequence, with the…

A: The question can be solved as follows

Q: A supernova remnant is now 3.85 pc in radius and is expanding at 3,350 km/s. Approximately how many…

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Q: For the PP chain 0.7% of the mass participating in nuclear fusion is liberated as energy which…

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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: If an X-ray binary consists of a 10-solar-mass star and a neutron star orbiting each other every…

A: from the equation relating the period of orbit P and the semi-major axis of orbit a, we have…

Q: yades Cluster Age. This chapter states that the Hyades cluster is 650 million years old. What is the…

A: Given: This chapter states that the Hyades cluster is 650 million years old.  Introduction: What we…

Q: using the center of mass equations or the Center of Mass Calculator (under Binary Star Basics,…

A: Given: In this question, the given details are, To investigate a specific binary-star system by…