Questions: Question 4 (1 point) Match each star with the approximate spectral class: The strongest lines are those of ionized helium. The strongest lines are those of neutral metals and 1. A bands of titanium oxide. Lines of ionized calcium are 2. O the strongest in the spectrum; hydrogen lines 3. G show only moderate Balmer lines of hydrogen 4. M are very strong; some lines of ionized metals are present.

Question 4 (1 point) Match each star with the approximate spectral class: The strongest lines are those of ionized helium. The strongest lines are those of neutral metals and 1. A bands of titanium oxide. Lines of ionized calcium are 2. O the strongest in the spectrum; hydrogen lines 3. G show only moderate Balmer lines of hydrogen 4. M are very strong; some lines of ionized metals are present.
Transcript text: Question 4 (1 point) Match each star with the approximate spectral class: The strongest lines are those of ionized helium. $\square$ The strongest lines are those of neutral metals and 1. A bands of titanium oxide. $\square$ Lines of ionized calcium are 2. O the strongest in the spectrum; hydrogen lines 3. G show only moderate Balmer lines of hydrogen 4. $M$ $\square$ are very strong; some lines of ionzed metals are present.
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Solution

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Solution Steps

Step 1: Ionized Helium Lines

The first description mentions that the strongest lines are those of ionized helium. This corresponds to spectral class O.

Step 2: Neutral Metals and Titanium Oxide

The second description indicates that the strongest lines are those of neutral metals and bands of titanium oxide. This is characteristic of spectral class M.

Step 3: Ionized Calcium and Moderate Hydrogen Lines

The third description states that lines of ionized calcium are the strongest, with hydrogen lines showing only moderate strength. This corresponds to spectral class G.

Step 4: Strong Balmer Lines and Ionized Metals

The final description indicates strong Balmer lines of hydrogen and the presence of some ionized metal lines. This is characteristic of spectral class A.

Final Answer:

  • Ionized helium: O
  • Neutral metals and titanium oxide: M
  • Ionized calcium and moderate hydrogen lines: G
  • Strong Balmer lines and ionized metals: A
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