Spectral Classification

From USS Wolff Wiki
Revision as of 06:24, 30 December 2014 by TheDrew (talk | contribs) (Created page with "__NOTOC__ Spectral classification is the classification of stars based upon the temperature of the photosphere. Each spectral class is further divided into 10 subclasses, ran...")

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Spectral classification is the classification of stars based upon the temperature of the photosphere. Each spectral class is further divided into 10 subclasses, ranging from 0 (hottest) to 9 (coolest). Stars are also placed into one of six categories based upon luminosity: 1a (luminous supergiants), 1b (less luminous supergiants), II (luminous giants), III (normal giants), IV (subgiants), and V (main sequence and dwarf stars).

For example, Sol is classified as type G2V. This indicates that is a Spectral Class G star of considerable temperature, and that it is a part of the main sequence.

Contents

Spectral Class B Spectral Class A Spectral Class O Spectral Class F
Spectral Class G Spectral Class K Spectral Class M

Spectral Class B

COLOR Blue AST SC B.png
SURFACE TEMP 10,000 - 28,000 K
COMPOSITION Neutral helium, some hydrogen
MASS 18 sols
RADIUS 7 sols
LUMINOSITY 20,000
MAGNITUDE -6
ABUNDANCE 0.13% of stars
LIFETIME 100 Million Years
EXAMPLES Rigel, Alpha Eridani

Spectral Class A

COLOR Light Blue AST SC A.png
SURFACE TEMP 7,500 - 10,000 K
COMPOSITION Strong hydrogen and ionized metals
MASS 3.2 sols
RADIUS 2.5 sols
LUMINOSITY 80.0
MAGNITUDE +1
ABUNDANCE 0.63% of stars
LIFETIME 1 billion years
EXAMPLES Vega, Sirius

Spectral Class O

COLOR Dark blue/violet AST SC O.png
SURFACE TEMP 28,000 - 50,000 K
COMPOSITION Ionized atoms, helium
MASS 60 sols
RADIUS 15 sols
LUMINOSITY 1,400.000
MAGNITUDE -3
ABUNDANCE 0.0000003125% of all stars
LIFETIME 10 million years
EXAMPLES Mintaka, Kalidar, Zeta Puppis

Spectral Class F

COLOR White AST SC F.png
SURFACE TEMP 6,000 - 7,500 K
COMPOSITION Hydrogen and ionized metals, calcium and iron
MASS 1.7 sols
RADIUS 1.3 sols
LUMINOSITY 6.0
MAGNITUDE +3
ABUNDANCE 3.1% of stars
LIFETIME 3 billion years
EXAMPLES Canopus, Procyon

Spectral Class G

COLOR Yellow AST SC G.png
SURFACE TEMP 5,000 - 6,000 K
COMPOSITION Ionized calcium, neutral and ionized metals
MASS 1.1 sols
RADIUS 1.1 sols
LUMINOSITY 1.2
MAGNITUDE +5
ABUNDANCE 8% of stars
LIFETIME 10 billion years
EXAMPLES Sol, Ka'Tula, Capella

Spectral Class K

COLOR Orange AST SC K.png
SURFACE TEMP 3,500 - 5,000 K
COMPOSITION Neutral Metals
MASS 0.8 sols
RADIUS 0.7 sols
LUMINOSITY 0.4
MAGNITUDE +10
ABUNDANCE 13% of stars
LIFETIME 50 billion years
EXAMPLES Arcturus, Aldebaran, Alpha Centauri

Spectral Class M

COLOR Red AST SC M.png
SURFACE TEMP 2,500 - 3,500 K
COMPOSITION Ionized Atoms, helium
MASS 0.2 sols
RADIUS 0.3 sols
LUMINOSITY 0.04
MAGNITUDE +15
ABUNDANCE Abundance
LIFETIME 200 billion years
EXAMPLES Betelgeuse, Proxima Centauri, Wolf 359