Store Chart ble Pictures Shapes SmartArt Screenshot My Add-ins Wilkipedia Name T
ID: 291379 • Letter: S
Question
Store Chart ble Pictures Shapes SmartArt Screenshot My Add-ins Wilkipedia Name The luminosity of a star refers to how much energy it sends out each second. This would be expressed Watts, the unit of Power. The second part of stellar spectra classification refers to a star's luminosity. The luminosity eight: 0, I, I, IlI, IV, v, vI, VII, and VIIl. (Our sun is a G2V star.) The more luminous stars have lower numbers. These more luminous stars tend to have more narrow lines absorption lines (the dark lines) in their spectra. The less luminous stars with the higher luminosity type numbers have more broad absorption lines in their spectra. classes are expressed as roman numerals, and range from zero through Spectra for stars of spectral type A0. A0 la A0 Ib A0 III Image from St. Mary's University http://www.ap.smu.ca/-ishort/ASTR2400/MKSpectra) 5. Is either Betelgeuse or Rigel A more luminous than our sun? If so, which starfs) are more luminous than our sun?Explanation / Answer
5. Yes.
Betelgeuse of the Orion Constellation is more lumionous than our star. The apparent magnitude of sun is -26.74 while that of Betelguese is 0.50. The Solar Luminosity of Betelguese is 150,000 (taking luminosity of Sun as 1).