Question

A star has a spectrum with lines indicating the presence of ionized helium. This star should be classified as a(n) _____ type star.
O
A
G
M

Answer 1

It should be o,not 100% sure tho

Answer 2

Answer:

A star has a spectrum with lines indicating the presence of ionized helium. This star should be classified as a(n) O type star.

Explanation:

Helium is a noble has. Its formation and ionization requires high temperature which is possible only in core of stars. Stars classified based on temperatures. Type O stars have very high temperatures (more than 30,000 K). At these temperatures, Helium gets ionized. Thus, the spectrum of O-type stars indicates the presence of ionized helium more than the neutral.