Vega is an A0 V star. Based on this information, which of the following are true
I.Vega has a surface temperature less than the Sun.
II.Vega has a mass that is greater than that of the Sun.
III.Vega is more luminous than the Sun.
IV.Vega is located in the upper left-hand corner in the H-R diagram.
A)I & II
B)II & III
C)II, III, & IV
D)I, II, & III
E)I, II, III, & IV

Question

Vega is an A0 V star. Based on this information, which of the following are true 
I.Vega has a surface temperature less than the Sun.
II.Vega has a mass that is greater than that of the Sun.
III.Vega is more luminous than the Sun.
IV.Vega is located in the upper left-hand corner in the H-R diagram.
A)I & II
B)II & III
C)II, III, & IV
D)I, II, & III
E)I, II, III, & IV

Quizplus · Accepted Answer

Vega is classified as an A0 V star, meaning it is a main-sequence star with a surface temperature of approximately 10,000 K. This temperature is actually hotter than the surface temperature of the Sun, which is around 5,500 K. Therefore, statement I is false.

As a main-sequence star, Vega has a mass that is similar to that of the Sun, so statement II is also false.

However, Vega is more luminous than the Sun, as it is classified as a high-luminosity main-sequence star. Therefore, statement III is true.

Finally, the location of Vega on the H-R diagram would be in the upper left-hand corner of the main sequence, but not necessarily the overall H-R diagram. Although statement IV is likely true, it is not necessarily always true, so we cannot select choice C.

Therefore, the best choice is B, which only includes statement III as true.

Vega Is an A0 V Star