1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.
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1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.
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- 7) Calculate the luminosity of a star that has a radius of 4.2Rsumn and a temperature of 5T su SunWhich 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.The white dwarf that remains when our Sun dies will be mostly made of A. helium. B. carbon. C. neutrons. D. hydrogen. Is the answer B? Thanks!
- An eclipsing binary will a. be more luminous than a visual binary. b. always be a spectroscopic binary. c. give off most of its light in the infrared. d. show a constant Doppler shift in its spectral lines. e. show two stars with variable proper motion.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.