Answer to Question #76559 in Astronomy | Astrophysics for Rohit Kumar

Question

1. a) Compare the brightness of the stars Sirius B and Sun using the data given in Table
1.3 of Unit 1.
b) Express the distances of the stars Sirius A and Antares from the Earth in light years.
2. a) The zenith distance of a star at latitude 60° N is 25°. Calculate its declination.
b) Explain the horizon coordinate system with the help of a diagram.
c) The local time at Allahabad is 5 PM. Calculate the local time at New Delhi at that time.
3. a) Explain the nebular model of the solar system.
b) Show that the magnitude of the tidal force experienced on the Earth due to the Moon depends on the latitude.
4. a) The absolute visual magnitude of a star is 6.5 and for its temperature, the bolometric correction is − 0.3. Calculate the absolute bolometric magnitude and the luminosity of the star.
b) What is H-R diagram? Discuss the characteristic features of stars located in any two distinct regions of the H-R diagram.
c) Explain how fusion reactions are made possible in the stars.

Answer 1

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