Calculate the distance of a star if the stellar spectrum indicates an absolute magnitude of -10.0, and the star has an apparent magnitude of 5.0 as seen from Earth.
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5. Calculate the distance of a star if the stellar spectrum indicates an absolute magnitude of -10.0, and the star has an apparent magnitude of 5.0 as seen from Earth.
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- 7) Calculate the luminosity of a star that has a radius of 4.2Rsumn and a temperature of 5T su SunQ3.2 The supergiant star has a surface temperature of about 2900 K and emits a power of approximately 4 x 1030 W. Assuming that is a perfect emitter and spherical, find its radius. (hint: Area of the sphere is A = 4πr²)Which stars have the longest period of variability? a. RR Lyrae b. Type I (classical) Cepheids c. Type II Cepheids d. main-sequence stars e. All have the same period.
- 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.