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What is the temperature range of a class O star?
25,000 - 50,000 K
What is the temperature range of a class B star?
11,000 - 25,000 K
What is the temperature range of a class A star?
7500 - 11,000 K
What is the temperature range of a class F star?
6000 - 7500 K
What is the temperature range of a class G star?
5000 - 6000 K
What is the temperature range of a class K star?
3500 - 5000 K
What is the temperature range of a class M star?
Less than 3500 K
What colour are class O stars?
Blue
What colour are class B stars?
Blue
What colour are class A stars?
Blue-white
What colour are class F stars?
White
What colour are class G stars?
Yellow-white
What colour are class K stars?
Orange
What colour are class M stars?
Red
What are the prominent absorption lines in class O stars?
He+, He, H
What are the prominent absorption lines in class B stars?
He, H
What are the prominent absorption lines in class A stars?
H, ionised metals
What are the prominent absorption lines in class F stars?
Ionised metals
What are the prominent absorption lines in class G stars?
Ionised and neutral metals
What are the prominent absorption lines in class K stars?
Neutral metals
What are the prominent absorption lines in class M stars?
Neutral atoms, titanium oxide
What is the prominence of hydrogen balmer lines in class O stars?
Weak
What is the prominence of hydrogen balmer lines in class B stars?
Weak, but stronger than in class O stars
What is the prominence of hydrogen balmer lines in class A stars?
Strong
What is the prominence of hydrogen balmer lines in class F stars?
Weak
What is the prominence of hydrogen balmer lines in class G stars?
None
What is the prominence of hydrogen balmer lines in class K stars?
None
What is the prominence of hydrogen balmer lines in class M stars?
None
