$$\begin{array} { | l | c | c | }
\hline { \text { Star } } & \begin{array} { c }
\text { Parallax } \
\text { (sec of arc) }
\end{array} & \begin{array} { c }
\text { Spectral } \
\text { Type }
\end{array} \
\hline 5 \text { Cen } & 0.026 & \text { B2 IV } \
\hline \text { HR 4758 } & 0.05 & \text { G0 V } \
\hline \text { HD 39801 } & 0.005 & \text { M2 I } \
\hline 9 \mathrm { CMa } & 0.4 & \text { Al V } \
\hline
\end{array}$$
-Which star in the table has the largest diameter?

Question

$$\begin{array} { | l | c | c | } 
\hline { \text { Star } } & \begin{array} { c } 
\text { Parallax } \
\text { (sec of arc) }
\end{array} & \begin{array} { c } 
\text { Spectral } \
\text { Type }
\end{array} \
\hline 5 \text { Cen } & 0.026 & \text { B2 IV } \
\hline \text { HR 4758 } & 0.05 & \text { G0 V } \
\hline \text { HD 39801 } & 0.005 & \text { M2 I } \
\hline 9 \mathrm { CMa } & 0.4 & \text { Al V } \
\hline
\end{array}$$
-Which star in the table has the largest diameter?

Quizplus · Accepted Answer

The diameter of a star is related to its spectral type and luminosity. Generally, stars with later spectral types (such as M stars) have larger diameters than earlier spectral types (such as B or G stars). In this table, HD 39801 has the latest spectral type (M2) of all the stars listed, indicating that it is likely to have the largest diameter. Additionally, it is classified as a supergiant (I), which also suggests a large size. Therefore, the answer is C) HD 39801.

-Which Star in the Table Has the Largest Diameter? A)

-Which Star in the Table Has the Largest Diameter?
A)