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A-Level Astrophysics > Characteristics of Spectral Classes > Flashcards

Characteristics of Spectral Classes Flashcards

1
Q

What are the colour of O-class stars?

A

Blue

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2
Q

What are the colour of B-class stars?

A

Blue

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3
Q

What are the colour of A-class stars?

A

Blue-white

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4
Q

What are the colour of F-class stars?

A

White

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5
Q

What are the colour of G-class stars?

A

Yellow-white

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6
Q

What are the colour of K-class stars?

A

Orange

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7
Q

What are the colour of M-class stars?

A

Red

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8
Q

How does the colour vary over the different spectral classes?

A

O → F → M

Blue → White → Red

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9
Q

How does the temperature vary over the different spectral classes?

A

O → M

Hotter → Cooler

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10
Q

What is the temperature of O-class stars?

A

25,000K - 50,000K

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11
Q

What is the temperature of B-class stars?

A

11,000K - 25,000K

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12
Q

What is the temperature of A-class stars?

A

7,500K - 11,000K

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13
Q

What is the temperature of F-class stars?

A

6,000K - 7,500K

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14
Q

What is the temperature of G-class stars?

A

5,000K - 6,000K

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15
Q

What is the temperature of K-class stars?

A

3,500K - 5000K

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16
Q

What is the temperature of M-class stars?

A

< 3,500K

17
Q

What are the strongest spectral line absorptions for O-class stars?

A

Helium ions and helium atoms

weak hydrogen

18
Q

What are the strongest spectral line absorptions for B-class stars?

A

Helium atoms and Hydrogen

19
Q

What are the strongest spectral line absorptions for A-class stars?

A

Strongest Hydrogen

some metal ion

20
Q

What are the strongest spectral line absorptions for F-class stars?

A

Metal ions

21
Q

What are the strongest spectral line absorptions for G-class stars?

A

Metal ions and metal atoms

22
Q

What are the strongest spectral line absorptions for K-class stars?

A

Metal atoms

23
Q

What are the strongest spectral line absorptions for M-class stars?

A

Cool enough for molecules to form;

Titanium oxide

24
Q

How do the spectral lines vary over the different spectral classes?

A 
Helium ions
Helium atoms
Hydrogen
Metal ions
Metal atoms
Titanium oxide

A-Level Astrophysics (11 decks)

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