Star Classification Page 2
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1
2
3
4Spectral Classes
Averag
Averag
Approximat
e
Average
Star
e Mass
Main
e Surface
Radius
Luminosit
Typ
Color
(The
Characteristic
Examples
Temperatur
(The
y (The Sun
e
Sun =
s
e
Sun =
= 1)
1)
1)
Singly ionized
helium lines (H
I) either in
4
over 25,000
10
10
O
Blue
60
15
emission or
K
HIGHEST
Lacertra
absorption.
Strong UV
continuum.
Neutral helium
11,000 -
Rigel
3
3
3
B
Blue
18
7
10
lines (H II) in
25,000 K
Spica
absorption.
Hydrogen (H)
lines strongest
7,500 -
Sirius,
A
Blue
3.2
2.5
80
for A0 stars,
11,000 K
Vega
decreasing for
other A's.
Ca II
Blue
absorption.
6,000 - 7,500
Canopus,
to
Metallic lines
F
1.7
1.3
6
K
Procyon
White
become
noticeable.
Absorption
White
lines of neutral
1.2
to
5,000 - 6,000
metallic atoms
Sun,
G
1.1
1.1
Yello
K
and ions (e.g.
Capella
-1
10
w
once-ionized
calcium).
Orang
Metallic lines,
3,500 - 5,000
0.4
Arcturus,
e to
some blue
K
0.8
0.9
-2
K
10
Aldebaran
Red
continuum.
0.04
Some
under 3,500
molecular
Betelgeuse
(very
M
Red
0.3
0.4
K
bands of
,
Antares
faint)
-4
10
titanium oxide.
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