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Star data from the Stars web-site Graphic from the Astralia telescope web-site

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Assignment 2 (Exploring the Universe)



To See Other Assignments in the Exploring the Universe Series: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |

Introduction to the Night Sky

Question1

a) Compare and contrast the colours of Arcturus, Regulus, Spica and Delta Virginis.
b) Identify the separate components of the binary gamma Virginis. As usual make a sketch of what you see indicating orientation, date, time and location from which your observation was made.

Answer (a)

Star	ID	Details
Spica	1	A binary star where both primary and secondary are B class and are very close together. The primary is a hot 22,400K and is therefore, observationally blue in colour.
Regulus	2	This B class star has a very fast rotational speed making it oblate in shape. The poles radiate at 15,400K and the equator at 10,200K giving it it's blue-white colour
Arcturus	3	A K class star with a surface temperature of 4,290K. Although it shines some 113 times brighter than the Sun much of its radiation energy is in the infrared.
Delta Verginis	4	The coolest of the 4 featured stars, this M class star is big with a radius of 61 times that of the Sun. The low surface temperature of 3,720K gives it a red-orange colour.

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