How can a neutron star in a binary system generate X-rays?
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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
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Q: A star with mass m, period Ti = 30 days, and radius ri = 1E4 km collapses into a neutron star (Links…
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Q: What is the average density of a neutron star that has the same mass as the sun but a radius of only…
A: r=Radius of star=86.234 kmm=Mass of star=Mass of Sun=1.989×1030 kgV=Volume of star=43πr3
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- If the gravitational attraction is important in a neutron star where the neutrons are close together, then why isn’t the gravitational interaction important in a nucleus with many neutrons?Please do fast ASAP fastA main sequence star of mass 25 M⊙has a luminosity of approximately 80,000 L⊙. a. At what rate DOES MASS VANISH as H is fused to He in the star’s core? Note: When we say “mass vanish '' what we really mean is “gets converted into energy and leaves the star as light”. Note: approximate answer: 3.55 E14 kg/s b. At what rate is H converted into He? To do this you need to take into account that for every kg of hydrogen burned, only 0.7% gets converted into energy while the rest turns into helium. Approximate answer = 5E16 kg/s c. Assuming that only the 10% of the star’s mass in the central regions will get hot enough for fusion, calculate the main sequence lifetime of the star. Put your answer in years, and compare it to the lifetime of the Sun. It should be much, much shorter. Approximate answer: 30 million years.
- Integrate the first equation over all wavelengths to find an expression for the total luminosity of a black body star. (See the second equation for a hint)Given the mass of the sun (1.989 x 10^30 kg), calculate the average density of a neutron star with a radius of 37.779 km.What happens on the surface of a neutron star to produce bursts of X rays?
- If neutron stars are hot, why aren't they very luminous?Why the Neutron stars do not collapse further?Calculate the gravitational redshift of radiation of wavelength 550 nm that is emitted from a neutron star having a mass of 5.8 x 1030 kg and a radius of 10 km. Assume that the radiation is being detected far from the neutron star.
- A star has initially a radius of 640000000 m and a period of rotation about its axis of 20 days. Eventually it changes into a neutron star with a radius of only 50000 m and a period of 0.2 s. Assuming that the mass has not changed, find Assume a star has the shape of a sphere. (Suggestion: do it with formula first, then put the numbers in) [Recommended time : 5-8 minutes] (a) the ratio of initial to final angular momentum (Li/Lf) Oa. 1.42E+15 Ob. 19 Oc. 0.0527 Od. 7.06E-16 (b) the ratio of initial to final kinetic energy Oa. 8.18E-23 Ob. 456000 Oc. 2.19E-6 Od. 1.22E+22 52%Why are red dwarfs very dim.RR Lyrae stars have essentially the same luminosity curve, with periods of up to 1 day. False True 47