What do the blue shifted spectral lines of the star Sirius tell you - ProProfs Discuss
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What do the blue-shifted spectral lines of the star Sirius tell you about it?



A. It has a transverse velocity that is toward US.
B. Its surface temperature is higher than that of the Sun.
C. It has a radial velocity that is toward US.
D. It has a radial velocity that is away from US.
E. It has a transverse velocity that is away from US.

This question is part of Astronomy Test #2
Asked by Smatrypants, Last updated: Dec 18, 2018

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3 Answers

C. Matz

Traveler and writer by profession.

C. MatzCollege student, Graduation, Orlando
College student, Graduation, Orlando

Answered on Dec 18, 2018

Many people are probably not aware of the names of stars unless they actually study the stars or they are a scientist. Sirius is probably the brightest star in the night sky. Another bright star is called the Canopus, but it is only the second brightest compared to the Sirius.

This star was discovered long ago because there are records of it in early times. Many explorers used the Sirius star in order to navigate and find their way to their destination. There are blue-shifted spectral lines on the star.

These lines tell you that this star has a radial velocity that is toward us. Radial velocity refers to the location of the object in reference to the person or item.

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G. Roland

G. RolandProfessor, Austin
Professor, Austin

Answered on Aug 27, 2018

The answer to this is C. It has a radial velocity towards us. If in case you are not familiar with Sirius yet, this is known to be the brightest star that we can see in our night sky at present time. It has a companion that is known as Sirius B. There are some people who are more familiar with Sirius by its other name, the Dog Star.

The fact that it has a high magnitude makes it easily visible when you look up at night. Just imagine how clear it would be when you are at the beach and there are almost no establishments nearby. You will be able to enjoy the night sky in its full glory.

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smatrypants

Smatrypants

Answered on Aug 28, 2017

It has a radial velocity that is toward us.
 Reply

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