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Chemical Abundances of Planetary Nebulae Chapter 3

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Chemical Abundances of Planetary Nebulae Chapter 3

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Questions and Answers

What is the primary use of the He II λ4686 Å line in planetary nebulae?

To estimate the distance to the nebula

To measure the temperature of the central star (CS)

To determine the elemental abundances within the nebula

To quantify the nebular excitation class (EC) (correct)

What is the minimum effective temperature required for the presence of the He II λ4686 Å line?

85 000 K (correct)

50 000 K

70 000 K

60 000 K

Which of the following parameters does NOT influence the excitation class of a planetary nebula?

Elemental abundances

Central star temperature

Nebular excitation level

Distance to the nebula (correct)

What is the range of excitation class (EC) where the He II λ4686 Å line is absent?

EC < 5 Signup and view all the answers

What is the purpose of equations (1) and (2) in Reid & Parker's (2010) classification scheme?

To classify the EC of the nebula Signup and view all the answers

How many classification schemes for the EC are mentioned in the text?

Four Signup and view all the answers

What is the relationship between the [O III]/Hβ line ratio and EC ≥ 5?

The ratio increases with increasing EC Signup and view all the answers

Which of the following is NOT a parameter that influences the EC of a planetary nebula?

Nebular distance from the central star Signup and view all the answers

What is the purpose of the He II λ4686 Å line in Reid & Parker's (2010) classification scheme?

To classify the EC of the nebula Signup and view all the answers

What is the primary factor that determines the excitation level of a planetary nebula?

Central star temperature Signup and view all the answers