Which spectral line does this likely correspond to?
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A star has a measured radial velocity of 100 km/s. If you measure the wavelength of a particular spectral line of Hydrogen as 486.42 nm, what was the laboratory wavelength (in nm) of the line? (Round your answer to at least one decimal place.)
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- Complete the ray diagram age fromThe above spectrum is most plausibly produced by which kind of object? Select one alternative: A planet A planetary nebula A galaxy A star A supernovaA bright red star is moving towards Earth. Which of the choices best completes the following statement describing the spectrum of this star? A(n) ___________ spectrum that is _______ relative to an unmoving star. A. continuous; blueshifted B. continuous; redshifted C. emission; redshifted D. absorption; blueshifted E. absorption; redshifted
- At rest hydrogen has a spectral line at 143 nm if this line is observed at 138nm for the star Sirius how fast is Sirius moving in km/sIf a star has a surface temperature of 20,000 K (2.00 × 104 K), at what wavelength will it radiate the most energy?The white dwarf star Sirius B has a luminosity of 0.025 L⊙. If you were 1 AU from Sirius B, would that star appear brighter or fainter than the full Moon appears from Earth? If Sirius B were substituted for the Sun, what would Earth’s average temperature become? (Earth’s current average temperature is T = 287K)
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- An astronomer observes several stars with different colors. Rank them in order from highest temperature to lowest temperature. 1 is the highest temperature, 2 is the next highest, 3. Third highest, 4. lowest temperature orange-red star bluish-white star yellowish-white star red starGo 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…Proxima Centauri, the star that’s closest to Earth (besides the Sun) is a red dwarf star. It’s peak wavelength is approximately 969 nm. What is its surface temperature? What is its total flux?