If the inner accretion disk around a black hole has a temperature of 1,000,000 K, at what wavelength will it radiate the most energy? What part of the spectrum is this in?
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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: If the hottest star in the Carina Nebula has a surface temperature of 51,000 K, at what wavelength…
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- What is the relationship between the color of a reflection nebula and the color of the star that illuminates it?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)How many times hotter than our sun is the hottest type O star, which has a surface temperature 40,000 K? Number times hotter =
- Barnard's Star is the 2nd closest star to Sol (~ 6 light years). It is moving toward the Earth with a speed of 110 km/s. Calculate the blue shift of light from Barnard's star, defined by AX/X. OA: OB: OC: OD: OE: -3.668x10-4 -4.586x10-4 -5.732x10-4 -7.165x10-4 OF: OG: -8.956x10-4 -1.120x10-3 -1.399x10-3 OH: -1.749x10-3A certain star has a temperature twice that of the Sun and a luminosity 64 times greater than the solar value. What is its radius, in solar units?The three most prominent spectral lines of hydrogen are H-α at 656 nm, H-β at 486 nm, and H-γ 434 nm. If we observe an object with H-α at a wavelength of 700 nm, what wavelength will we observe H-β and H-γ? Is the object moving toward or away from us, and how do you know? Suppose we observe another object with H-α at 585 nm. Is this object moving toward or away from us? Is it moving slower or faster than the first object?
- The hottest star in the Orion Nebula has a surface temperature of 40,000 K. At what wavelength does it radiate the most energy?Studying the spectrum of a star, we see that the Haline (l= 656.285nm) has been shifted to 656.286 nm. Is the star moving towards us or away (explain your answer) How fast is the star moving with respect to us?Why are emission nebulae red ?
- Which of these colors of light passes most easily through interstellar clouds? a Green light b Red light c Blue light d Violet light(Answer don't copy with hand written please)As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 12 times that of the Sun, but a surface temperature 0.5 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is A = 4πr2.