(Astronomy) PSR1913+16 Problem I. Are the two stars in PSR 1913+16 pulsars, neutron stars, or a combination of the two?
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(Astronomy)
PSR1913+16 Problem I. Are the two stars in PSR 1913+16 pulsars, neutron stars, or a combination of the two?
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- International Astronomical Union reported on 24 Feb 1987: An object was discovered on Feb. 24.37 UT (position R.A. = 5h35m.8, Decl. = -69 18'), obtained m = 4.8 on Feb. 24.454 UT. This object proved to be the most famous supernova (SN) in the 20th Century and the brightest visible from Earth since 1604. It is classified as a SN of the type Il in the Large Magellanic Cloud (SN1987A). Its brightness peaked in May 1987, with an apparent magnitude of m = 2.8. a) Find the absolute magnitude M of the SN1987A at maximum. Distance of the LMC is 51,400 pc. b) The progenitor (before SN explosion) star was a blue supergiant of the apparent magnitude m = 12.8. How much brighter (in terms of flux density) this SN was at maximum compared to the progenitor star. Find the ratio FSN / EbeforeThe speed of light in vacuum is 300,000 km/s. Suppose that the pulse rate of a pulsar is 0.001 s. Then its size cannot be bigger than about O A. 30,000 km. OB. 300,000 km. OC.3,000 km. O D. 300 km.F2 Which of the following can a black hole not "eat" or consume? #3 E another black hole a planet black holes can eat anything O a cloud of gas and dust O a star F3 $ 4 R F4 Q Search DII % 5 F5 T L ☀ < F6 6 Y ☀ F7 & 7 PrtScn U F8
- The hydrogen Balmer line Hβ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the redshift of this quasar? a. 5 b. 0.5 c. 0.25 d. 4 e. 1944.4As6One of our closest stars is our Sun, duh. If the distance from Earth to our Sun is 1.56e-05 light-years, how quickly is that star travelling away from us? [Note that Hubble's Constant is roughly 70 km/s/Mpc and 1 light-year is roughly 3.07E-7 Mpc.] m/s
-  Q/ b) Vega Star of radius (1.6832) million km emit a) thermal radiation as a black body radiation at temperature of (18500 K). Calculate the Luminosity of this star. [o is Stefan-Boltzmann constant = 5.67 *x 10-5 erg cm-2 K-4 s-1]The area of the event Horizon of a black hole is 4tRg². Use the Schwarzschild metric to verify this. (Please answer in detail or skip)Imagine that you are observing the light from a distant star that is located in a galaxy 100 million lightyears away from you. By analysis of the starlight received, you are able to tell that the image we see is of a 10- million-year-old star. You are also able to predict that the star will have a total lifetime of 50 million years, at which point it will end in a catastrophic supernova. a) How old does the star appear to be to us here on Earth now? b) How long will it be before we receive the light from the supernova event? c) Has the supernova already occurred? If so, when did it occur?