erstanding the Mass- Luminosity Relation How do we make sense of stellar lifetimes? Mo t(yr) 0.08 1 40 >1x1012 1x1010 3x106 150 3x106
Q: How does the lighthouse model explain pulsars? in two sentences.
A: Pulsars are spinning neutron stars that emit beams of radiation from their magnetic poles
Q: The expanding bubble of hot gas shown in the figure, which has been inflated by the light from a…
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Q: 2.
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Q: Determine the mean molecular mass of a star for both the scenario of being completely neutral and…
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Q: 1.0 0.8 0.6 Cosmic background data from COBE 0.4 0.2 0.0l 0.5 10 Wavelength A in mm c) The left hand…
A: from the graph, the maximum intensity of radiation is at λ=1 mm. From Wein's law, we have…
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: Consider a close binary system composed of a white dwarf, a giant star, and an accretion disk. Which…
A: Given Data: Let us consider the given closed binary system composed of a white dwarf , a giant star…
Q: Find the wavelength of peak intensity for a hot 45000 K star that emits thermal radiation.
A: Given that:Temperature of the hot star : (T) =45000 K Now, From Wien’s displacement Law…
Q: How long a star "lives" depends on: O its color. whether it is single or binary. O its starting…
A: The more mass the star has faster it burns down and explode into a supernova.
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: If a neutron star has a radius of 9.12 km and a temperature of 3.63 x 106 K, how luminous is it in…
A: 1)Using stefan's lawP = σ A T4Where P is the power σ is the stefan's constant A is the area of…
Q: To find the Sun’s luminosity from its brightness using the inverse-square law, you also had to be…
A: The distance to the sun can be calculated using the method of parallax. Parallax is defined as the…
Q: 13) Calculate the luminosity in watts from the absolute magnitude for the given stars: (a) Vega (M =…
A: The energy radiated per unit of time by an astronomical object is called luminosity. The…
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: (Astronomy) X-Ray Binary. If an X-ray binary consists of a 20-solar-mass star and a…
A: Solution: Given Values, Mass of the star A MA=20 solar mass Mass of the neutron star MS=2.25…
Q: The CMB contains roughly 400 million photons per m³. The energy of each photon depends on its…
A: The wavelength is 0.0011 m. The energy of a photon is 1.807×10-22 J.
Q: Determine the surface gravity on a neutron star. Assume the star has a mass 50% bigger than the…
A: mass of Sun = 1.98 * 1030 Kg mass of neutron star = mass of sun + 50%mass of sun = 1.5 * 1.98 *…
Q: If neutron stars are hot, why aren’t they very luminous? in two sentences
A: Neutron stars are hot but they are not luminous because of the following reasons:
Q: What is the orbital period (in s) of a bit of matter in an accretion disk that is located 6 ✕ 105 km…
A: Write the given values with the suitable variables. r=6×105 km=6×108 mM=99Mo=992×1030 kg=198×1030 kg…
Q: 4. Our Sun now spins once every 25 days and was formed from the gravitational contraction of an…
A: Given data The time taken by the sun is given as T1 = 25 days. The distance of the cloud is given…
Q: Calculate the surface temperature of the star Betelgeuse whose λmax is 850 nm
A: Wien's Law of Blackbody Radiation λmaxT = a constant = 3 × 106 where λmax = wavelength of radiation…
Q: The stars in a binary system are a 4 MO main sequence star and a 1 MO red giant. Explain why this…
A: A binary star system is formed when two stars come close enough to form an orbit around its…
Q: Consider two stars with temperatures of 10,000 and 25,000 Kelvin. 3. Calculate the ratio of atoms in…
A: Given: In this question, the given details are, Consider two stars with temperatures of 10,000 and…
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: 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: and is 10^16m distant from us, what would we measure its brightness to be? If we then moved that…
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Q: 2. The Orion Nebula is a gas-rich region in which stars are being born. The nebula is at a distance…
A: Given, Distance of nebula from earth is, d = 1344 light year = 412.07 Parsec Apparent magnitude of…
Q: If the radius of the neutron star is 85.074 km, what is the average density of a neutron star that…
A: To Find : density of neutron star
Q: Find the wavelength of peak intensity for a hot 45000 K star that emits thermal radiation.
A: Given information:Temperature of the object (T) = 45000 K
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: In this problem, we derive the mass luminosity relation. There are three equations to be looked at.…
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Q: The luminosity of a Seyfert galaxy nucleus varies in a time-scale of 6 days. What could be the…
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Q: Consideration of the total energy in a radio lobe of an AGN implies that the energy is distributed…
A: Explanation -: The scaling of the magnetic field with observed luminosity (Las) in the…
Q: What is the most fascinating feature of the standard model
A: The Standard Model of particle physics is a hypothesis that classifies all known constituent…
Q: Explain why massive stars evolve faster?
A: Stars are formed in the interstellar medium. The interstellar medium contains hydrogen and helium…
Q: A Type Ia supernova is observed and achieves an apparent magnitude of m = 19.89 at peak brightness.…
A: Given Values :The absolute magnitudes of Type Ia supernovae at peak brightness, M = -19 Apparent…
Q: Which of the following is not correct regarding Cepheid variable stars. They can be measure out…
A: Cepheid variables are not main sequence stars. Rather, they are stars that are in the helium burning…
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: Astronomers are studying the supermassive black hole (SMBH) of an AGN with a mass of 108 Mo. The…
A: Given : Red shift of SMBH = 0.05 Velocity of dispersion = 300 km/s…
Explain why lifetime is approximately constant for very massive stars but goes as M-3 for low mass stars
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