By Aniket Sule

It is a compilation of difficulties from the foreign Olympiad in Astronomy and

Astrophysics (2007-2012).

**Read or Download A Problem book in Astronomy and Astrophysics PDF**

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**Extra resources for A Problem book in Astronomy and Astrophysics**

**Sample text**

1 Theory 1. 0”. Assume that the orbital period is 100 years, and that the orbital plane is perpendicular to the line of sight. 0”, estimate the mass of each component of the binary system, in terms of solar mass. (I10 - T04 - A) 2. An eclipsing close binary system consists of two giant stars with the same sizes. As a result of mutual gravitational force, stars are deformed from perfect sphere to the prolate spheroid with a = 2b, where a and b are semi-major and semi-minor axes (the major axes are always colinear).

Luminous Blue Variable (LBV) stars greatly vary in visual brightness; however, their bolometric magnitude remains constant. Imagine a LBV star with a black body temperature of 5000 K at its maximum visual brightness, and 30,000 K at its minimum visual brightness. Calculate the ratio of the star radius between both situations above. (I12 - T07 A) 5. 5 times that of our Sun. Give your answer in units of the solar luminosity, assuming the surface temperature of the Sun to be 5800 K. (I07 - T09 - A) 6.

B) Mark the field of view of the camera on the map. (c) Use this information to obtain the physical dimensions of the CCD chip in mm. 2. ) (e) Compare the result with theoretical size of the diffraction disc of the telescope. (f) Seeing of 1” often considered to indicate good conditions. Calculate the size of the star image in pixels if the atmospheric seeing was 1” and compare it with the result from question 1d. 1. 1 around Object 2. On the other hand A shows the same area observed some time earlier.

### A Problem book in Astronomy and Astrophysics by Aniket Sule

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