Stars Flashcards
(12 cards)
Order of class
OBAFGKM
Class O
Colour, temp and absorption lines
Blue
25,000-50,000
He^+,He,H
Class B
Colour, temp and absorption lines
Blue
11,000-25,000
He,H
Class A
Colour, temp and absorption lines
Blue-white
7,500-11,00
H(strongest), ionised metals
Class F
Colour, temp and absorption lines
White
6,00-7,500
Ionised metals
Class G
Colour, temp and absorption lines
Yellow-white
5,000-6,000
Ionised+neutral metals
Class K
Colour, temp and absorption lines
Orange
3,500-5,000
Neutral metals
Class M
Colour, temp and absorption lines
Red
<3500
Neutral atoms, TiO
Absorption lines only come from
Electrons in hydrogen atoms moving from higher levels to n=2. Energy emitted in all directions so relative intensity decreases
Axis of hertz sprung Russel diagram
50,00-2,500K
15 up to -10
High mass Star is >
8 solar masses
Key features of an intensity time graph for a type 1a supernovae
Peak at -19.3
Peak 20 days after
