Stellar classification

Submitted by nikipetrov on 19 April, 2009 - 19:25

In astronomy, stellar classification is a classification of stars based on its spectral characteristics

Class	Temperature^[8] (Kelvin)	Conventional color	Apparent color^[9][10][11]	Mass^[8] (solar masses)	Radius^[8] (solar radii)	Luminosity^[8] (bolometric)	Hydrogen lines	Fraction of all main sequence stars ^[12]
O	≥ 30,000 K	blue	blue	≥ 16 M⊙	≥ 6.6 R_⊙	≥ 30,000 L_⊙	Weak	~0.00003%
B	10,000–30,000 K	blue to blue white	blue white	2.1–16 M⊙	1.8–6.6 R_⊙	25–30,000 L_⊙	Medium	0.13%
A	7,500–10,000 K	white	white to blue white	1.4–2.1 M⊙	1.4–1.8 R_⊙	5–25 L_⊙	Strong	0.6%
F	6,000–7,500 K	yellowish white	white	1.04–1.4 M⊙	1.15–1.4 R_⊙	1.5–5 L_⊙	Medium	3%
G	5,200–6,000 K	yellow	yellowish white	0.8–1.04 M⊙	0.96–1.15 R_⊙	0.6–1.5 L_⊙	Weak	7.6%
K	3,700–5,200 K	orange	yellow orange	0.45–0.8 M⊙	0.7–0.96 R_⊙	0.08–0.6 L_⊙	Very weak	12.1%
M	≤ 3,700 K	red	orange red	≤ 0.45 M⊙	≤ 0.7 R_⊙	≤ 0.08 L_⊙	Very weak	76.45%