Question

1. A star has a parallax of 0.324 arcseconds and apparent magnitude in V-band m= +1.55. Later observations reveal that the “star” is actually a close binary, with members star 1 and star 2. Star 1 is found to have mı = +1.83. (a) Find the apparent magnitude of star 2, m2. [2 marks] (b) What is the ratio of the V-band flux received from star 1 to that received from star 2? (c) Find the distance to the system (in parsec). (d) Find the absolute magnitudes of stars 1 and 2, and of the binary (i.e. the original “star”). (e) The bolometric corrections for the stars are BC1 = -0.09 and BC2 = -0.22. What are their bolometric luminosities (in solar units, L.)?

Answer 1

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