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- The absolute magnitude defines how bright a star would be if it was observed from a distance of 10 pc. It depends on the size of the star and the amount of light emitted by the star.
- Absolute magnitude defines the luminosity of a star on a logarithmic scale. Thus calculating absolute magnitude helps us to directly compare different stars.
- The absolute magnitude is given by,
Here L is the luminosity of the star and L0 is the zero-point luminosity and has a value of 3.0128 × 1028 W.
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- 14 Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.) A B C D Star 1 is 10 times more distant than Star 2. The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2. Star 1 is 100 times nearer than Star 2. Star 1 is 100 times more distant than Star 2. E Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other.Question help7) Calculate the luminosity of a star that has a radius of 4.2Rsumn and a temperature of 5T su Sun
- 1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.3- Consider a binary star system in which the two stars are seen to be 1.50" apart. Determine the actual physical separation of those stars (in AU) if this binary system is located 9.50 1.y. from us.31) Star Sirius has an apparent magnitude of -1.47 and an absolute magnitude of 1.41. Estimate the distance to Sirius.
- 33) A star is observed to be having an absolute magnitude of -5.6 and is located at a distance of 159.96 pc. Estimate the apparent magnitude8) A neutron star is found with a radius of 10 km and has a surface temperature of 1,000,000 K. Calculate its luminosity with respect to that of the Sun. nts)12 Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond. The distance to this star is A) 2 parsecs. B C 0.5 parsec. E 5 light-years. (D) 5 parsecs. 0.5 light-year.