Calculate the Eddington limit for star of 10³0 Msun.
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Q: Calculate the size to which the Sun should shrink to become a blackhole.
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Q: What is the maximum luminosity for star of 5.76×1010 Msun.
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A: White Dwarf: A small very dense star. A white dwarf is formed when low mass star has exhausted all…
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A: Given that Hydrogen has a spectral line at λ= 144 nm =10-9m This line is observed at λ'= 168 nm=10-9…
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Q: Find the speed for a star in which this line appears at wavelength 122.5 nmnm.
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Q: Calculate the surface temperature of the star Betelgeuse whose λmax is 850 nm
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A: a) Actual wavelength of Hα line is λactual=656.28 nm observed wavelength λobs=655 nm.
Q: radio lines of neutral Hydrogen (apart from H91α) What does H91α meaning for?
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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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- Show work. For the following: A parsec is a distance equal to 3.26 light years. The speed of light is 2.998 x 10°m/s. A nght year is a unit of distance equal to the distance light travels in one year. The brightest star in the night sky is Sirius, (Not the radio station) is 2.63 parsecs away. (1km30.621miles, 365d-1yr) How many miles away is this star?Consider the image above of the Cassiopeia A (Cas A) supernova remnant. The supernova explosion that caused this remnant was observed on earth about 300 years ago. It is about 3000 pc away. Since that time, the shockwave from the supernova has expanded to form the roughly spherical cloud pictured above. From the center point to the edge of the cloud is about 3 pc. Compute the angular diameter of the Cas A supernova remnant as viewed from Earth. Express your answer in arcminutes.If a binary star system has a 0.1M⊙ star and a 10.0M⊙ star with a measured periastron and apastron of 40 and 80 AUs, respectively, calculate the orbital period in years of the binary star system. Be sure to show all work!
- Consider the following question: How many times bigger than the sun would a cool star (4000K) have to be to give off the same amount of light as a sun-like star (T=6000K, R=1Rsun)?If Betelgeuse is a M2 type star, what is the approximate temperature of the star in K?Question 2: apparent magnitude my 1 = 305.9, b = −44.9 and is d=4.5 kpc from the Sun. a.) The integrated light from the Milky Way globular cluster NGC 104 has an 4.03 mag and absolute magnitude My -9.52 mag. It is located at b.) = = Estimate the amount of extinction between the Sun and 47 Tucanae in magnitudes. What does this value of extinction mean for the amount of attenuation by dust between Earth and NGC 104?.
- A 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.answer for 3Integrate 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)
- (Astronomy) PSR1913+16 Problem II. Using only the Figure, what are the maximum radial velocities as found from the redshift and blueshift, respectively? Note: redshifts have positive radial velocities values in the figure, whereas blueshifts have negative radial velocity values. (Answer in km/s)Go to Question 8 60 Msun I luminosity (solar units) 106 105 104 103 102 10 0.1 10-2 10-3 10-4 10-5 30 Msun 10 Solar Radii Lifetime 10 yrs 1 Solar Radius 0.1 Solar Radius 10-2 Solar Radius 10-3 Solar Radius 30,000 increasing temperature 102 Solar Radi B Centauri Spica 10 Msun Bellatrix MAIN Sirius B Lifetime 108 yrs B Rigel Deneb 6 Msun Achernar SEQUENCE Lifetime 10⁹ yrs WHITE SUPERGIANTS Msun Vega DWARFS Procyon B 103 Solar Radi Sirius Lifetime 1010 yrs A 10,000 Altair Canopus Procyon Sun Arcturus Polaris Lifetime 10¹1 yrs T Ceti 6,000 surface temperature (Kelvin) GIANTS x Centauri A Pollux x Centauri B Eridani F G K Aldebaran Barnard's Star Betelgeuse 61 Cygni A 61 Cygni B Lacaille 9352 0.3 Msun Antares M (It may help you to know that 1 Lsun is 3.8 x 1026 Watts. Use 3.1415 for Pi.) Wolf 359 Proxima Centauri DX Cancri Gliese 725 A Gliese 725 B 0.1 Msun Ross 128 3,000 decreasing temperature The physics of thermally radiating gases relates the luminosity (L), temperature (T) and radius…Calculate the redshift of a star if H-ß line of hydrogen from the star is observed to be 800 nm.