All millisecond pulsars are now, or once were, members of b nary star systems. (T/F)
Q: Taking the distance to the Crab pulsar to be 2000 pc and the bolometric magnitude at maximum…
A: The Crab Pulsar is described as a young neutron star. The star is the central star in the Crab…
Q: Life on Earth wouldn't be possible without supernovae. Why?
A:
Q: Suppose a planetary nebula is 4.6 pc in diameter, and Doppler shifts in its spectrum show that the…
A: The diameter of planetary nebula is given as, D=4.6 pc. Then, the radius of planetary nebula is…
Q: Suppose you observe a star orbiting the Galatic center at a speed of 1000 km/s in a circular orbit…
A:
Q: A supernova remnant is now 3.65 pc in radius and is expanding at 4,850 km/s. Approximately how many…
A: Given, Radius of remnant of supernova = 3.65 pc = 1.116×1014km Rate of expanding = 4850 km/s
Q: Why is it possible for repeated nova explosions to occur in the same binary system?
A: A binary star system is one in which two stars are bound to each other through gravity. They will…
Q: In binary star systems where a main-sequence star is transferring mass to a white dwarf star, which…
A: Required : The correct option
Q: A pulsating variable star with a period of 10 days would be a Cepheid having an absolute magnitude…
A: Pulsating variable star are made by expansion and contractions in the outer layers of any stars. Due…
Q: The Hydra super cluster is at a distance of about 800 MParsec. What is the recessional velocity?
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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: A nova is an event, not a stellar object. (True or false)
A: It is True. A nova is a transient astronomical event that causes the sudden appearance of a bright,…
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: true or false White Dwarfs generate energy through low grade thermonuclear reactions in their…
A: When a star exhausted all nuclear fuel it becomes a white dwarf. The mass of the white dwarf can…
Q: If the accretion disk around a neutron star has a radius of 2 × 105 km, what is the orbital velocity…
A: Neutron stars are formed when massive stars collapse under their own gravity. They are very…
Q: 7. If a car was on the highway and was trying to pass another ar and went from a speed of 60 m/s to…
A: Given : vo = 60 m/s v = 75 m/s t = 3 seconds
Q: What is the escape velocity at the surface of a typical neutron star?
A: In celestial mechanics, the escape velocity is defined as the minimum velocity required by a…
Q: Calculate the approximate lifetime of a 60 solar mass O star (1 million solar luminosities, 50% of…
A: The Lifetime of a Star:- The lifetime of a star is defined by the equation: τs=τo×MMo-2.5…
Q: what is the smallest planet that could be detected around a 0.4 Rsun M dwarf star?
A: transit depth is the ratio of surface area of planet and the star transit depth = πRp2πRs2 where Rp…
Q: A red giant loses a solar mass in 250,000 years via a superwind. After 0.8 million years, it has a…
A: The original mass f the red giant is 12.7 MSun.
Q: An AGN hosts a central Black Hole of mass 2×1038×1038 kg. The AGN emits at 1/51/5 of the Eddington…
A: To find the luminosity of the AGN, we can use the Eddington luminosity formula:L = η * (4 * π * G *…
Q: In a nova, why is the shell of hydrogen on the white dwarf consumed explosively rather than…
A: White stars are formed when stars that do not have enough mass to form neutron stars or black holes…
Q: Assume that you observe both of these stars in a galaxy 10 million light-years away. How bright is…
A: 1) Distance of both stats from observer, d = 10 million light years d = 10 x 106 ly d = 107 ly 1…
Q: Convert the average mass density in gm/cm-3 of a M = 0.5 Msun R = 0.015 Rsun white dwarf to the…
A: Given that For white dwarf star given that M = 0.5 Msun R = 0.015 Rsun We know that mass of sun…
Q: Observations show that the gas ejected from SN 1987A is moving at about 10,000 km/s. How long will…
A:
Q: Suppose that a neutron star has a radius of 10 km and a temperature of 1,000,000 K. How luminous is…
A: The luminosity of a star is defined as the total amount of electromagnetic energy released by a star…
Q: We learned in class that, when stars collapse under their own gravity, they conserve angular…
A:
Q: Protostar
A: Protostar is
Q: Why do you expect neutron stars to spin rapidly?
A: Neutron stars are formed when stars with 4 to 8 solar mass die. When such a star runs out of fuel…
Q: A 1.4 M. neutron star and a 0.5 M. white dwarf have been found orbiting each other with a period of…
A: The given formula works only if we put quantities in the units given, solar mass, years and…
Q: What is the size of a typical white dwarf? Group of answer choices 1.0 solar radii 0.5 solar…
A:
Q: Why did astronomers conclude that pulsars actually could not be pulsating stars?
A: Pulsars are defined as highly magnetized rotating neutron stars. They are capable of releasing beams…
Q: Type 1a supernovae are not: The result of exceeding the Chandrasehkar limit. Produced…
A: Required :: Type 1a supernovae are not:
Q: What makes the TOI-270 system particularly interesting is that the three exoplanets detected this…
A: Given that:Time period of TOI 270c, T1=5.7 dayTime period of TOI 270d, T2=11.4 day
Q: Why would astronomers naturally assume that the first discovered millisecond pulsar was relatively…
A: When a massive star collapses the gravitational force is so strong the protons and electrons inside…
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: mass
A: The evolution is affected by mass exchange in the binary. The higher mass Star use to be the lower…
Q: (Astronomy) Supernova Ejection Times. Observations show that the gas ejected from SN 1987A is…
A:
Q: What are the two possibilities for the final state of a close, massive binary system?
A: For a star in a binary system, there is a region surrounding the star where the orbiting object is…
Q: Given two stars in a binary star a total distance of 16 AU apart and an orbital period of 4 years…
A: Two Masses in the universe attract each other by a gravitational force. This force is directly…
Q: Chart the evolutionary process of a high mass star on the H–R diagram from ZAMS to death.
A: Required to draw: The evolution of high mass stars from Zero Age Main Sequence (ZAMS) to Death: We…
Q: A main sequence star of mass 25 M⊙has a luminosity of approximately 80,000 L⊙. a. At what rate DOES…
A: Given information: The mass of the star (m) = 25M⊙ The luminosity of the star (L) = 80000L⊙ part a):…
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