The spectral types of four stars are listed below. Which star has the largest radius
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The spectral types of four stars are listed below. Which star has the largest radius

[From: ] [author: ] [Date: 11-11-29] [Hit: ]
http://en.wikipedia.org/wiki/Stellar_cla…-Why itll be the A5 V, or at least that will give you the mark you deserve.......
The spectral types of four stars are listed below. Which star has the largest radius?

A A5 V

B F5 I

C G8 III

D M0 I

E more information is needed to answer

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M0I

This is a red-giant star, actually, to be precise, it's a red-supergiant (compare to VY Canis Majoris)

It could potentially be F5I, but most likely it's M0I

EDIT:

The I is a classification of the size of the star. You have I II III IV and V. The lower the roman numeral the larger the star. For instance, V means that it is a dwarf or main sequence star, like our Sun which is a G2V. The letter at the beginning is the spectral classification, and M is a red star. The number in the middle ranges from 0 - 9 which describes the position between two spectral classes on the HR diagram. Let's take the example of the Sun. The 2 in G2V means that it is 2/10 of the way to a K spectral class which is the next proceeding class of spectral type.

EDIT:

Oops... I didn't realize E was there. In this case it would be E. Since two stars are super-giants we don't know the exact size.

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Studying means finding the answer, not getting someone else to get it for you.

Its not hard to do a bit of searching to get the information you're looking for:
http://en.wikipedia.org/wiki/Stellar_cla…

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Why it'll be the A5 V, or at least that will give you the mark you deserve.
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