Star Type Classification

==Star Types==
Class Image	Class Name	Details
 	Class O 	An O-class (or O-type) star is a stellar classification for stars composed of ionized atoms, especially helium, emitting high amounts of ultraviolet radiation, generally referred to as being blue-violet or dark blue in color. O-type stars in the main sequence tend to be extremely hot (in the neighborhood of 28,000 to 50,000 Kelvin) and bright in terms of absolute magnitude, the "dark" and "violet" descriptors of their name are as such because of the large output of non-visible heat radiation.
 	Class B 	A B-class (or B-type) star is a stellar classification for a hot blue star that is composed of neutral helium and some hydrogen. The temperature is between 10,000 and 28,000 Kelvins, generally referred to as being a blue star.
 	Class A 	An A-class (or A-type) star is a stellar classification for stars composed of strong hydrogen and some ionized metals. The temperature ranges from 7,500 to 10,000 Kelvin, generally referred to as being blue-white or light blue in color.
 	Class F 	A Class F star is white and is made up of hydrogen and ionized metals. Also in the star there is calcium and iron. The temperature in this type of star is between 6,000 and 7,500 K.
 	Class G 	A G-class (or G-type) star is a stellar classification for stars composed of both neutral and ionized atoms of metallic substances, including ionized calcium, emitting in the neighborhood of 5,000 to 6,000 Kelvin, generally referred to as being yellow in color. G-type stars in the main sequence tend to be median in terms of absolute magnitude, and in the "cooler" half of the stellar classification system.
 	Class K 	A K class (also K type or orange star) is a type of star that is made up of neutral metals. The temperature is around 3,500 through 5,000 degrees Kelvin.
 	Class M 	An M-class (or M-type) star is a stellar classification for red star made up of ionized atoms, especially helium. The temperature is cool at 2,500 to 3,500 degrees K.
==Other Stellar Objects==
Class Image	Class Name 	Details
 	Brown Dwarf 	A brown dwarf is a "star" whose mass is too small to have nuclear fusion based on hydrogen to occur at its core (the temperature and pressure at its core are insufficient for hydrogen fusion) though they can fuse deuterium and rarely even lithium. A brown dwarf is not very luminous. Brown Dwarfs typically appear as magenta tinted because of absorption by sodium and potassium atoms of light in the green portion of the spectrum.
 	White Dwarf 	a small very dense star that is typically the size of a planet. A white dwarf is formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula.
 	Neutron Star	A neutron star is a type of stellar remnant that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Such stars are composed almost entirely of neutrons, which are subatomic particles without net electrical charge and with slightly larger mass than protons. Neutron stars are very dense (the average Neutron star contains 500,000 times the mass of the Earth in a sphere with a diameter no larger than that of Brooklyn), very hot and emit vast amounts of deadly radiation.
 	Black Hole 	A black hole is a region of spacetime from which gravity prevents anything, including light, from escaping.
=Spectral Type Characteristics=
 Main sequence stars (V)
Spectral Type	Temperature (K)	Absolute Magnitude	Luminosity (in solar luminosities)
O5 	54,000 	-4.5 	200,000
O6 	45,000 	-4.0 	140,000
O7 	43,300 	-3.9 	120,000
O8 	40,600 	-3.8 	80,000
O9 	37,800 	-3.6 	55,000
B0 	29,200 	-3.3 	24,000
B1 	23,000 	-2.3 	5550
B2 	21,000 	-1.9 	3190
B3 	17,600 	-1.1 	1060
B5 	15,200 	-0.4 	380
B6 	14,300 	0 	240
B7 	13,500 	0.3 	140
B8 	12,300 	0.7 	73
B9 	11,400 	1.1 	42
A0 	9600 	1.5 	24
A1 	9330 	1.7 	20
A2 	9040 	1.8 	17
A3 	8750 	2.0 	14
A4 	8480 	2.1 	12
A5 	8310 	2.2 	11
A7 	7920 	2.4 	8.8
F0 	7350 	3.0 	5.1
F2 	7050 	3.3 	3.8
F3 	6850 	3.5 	3.2
F5 	6700 	3.7 	2.7
F6 	6550 	4.0 	2.0
F7 	6400 	4.3 	1.5
F8 	6300 	4.4 	1.4
G0 	6050 	4.7 	1.2
G1 	5930 	4.9 	1.1
G2 	5800 	5.0 	1
G5 	5660 	5.2 	0.73
G8 	5440 	2.6 	0.51
K0 	5240 	6.0 	0.38
K1 	5110 	6.2 	0.32
K2 	4960 	6.4 	0.29
K3 	4800 	6.7 	0.24
K4 	4600 	7.1 	0.18
K5 	4400 	7.4 	0.15
K7 	4000 	8.1 	0.11
M0 	3750 	8.7 	0.080
M1 	3700 	9.4 	0.055
M2 	3600 	10.1 	0.035
M3 	3500 	10.7 	0.027
M4 	3400 	11.2 	0.022
M5 	3200 	12.3 	0.011
M6 	3100 	13.4 	0.0051
M7 	2900 	13.9 	0.0032
M8 	2700 	14.4 	0.0020
L0 	2600 	* 	0.00029
L3 	2200 	* 	0.00013
L8 	1500 	* 	0.000032
T2 	1400 	* 	0.000025
T6 	1000 	* 	0.0000056
T8 	800 	* 	0.0000036
*- not visible to the human eye (for the most part)Giants (III)
Spectral Type	Temperature (K)	Absolute Magnitude	Luminosity (in solar luminosities)
G5 	5010 	0.7 	127
G8 	4870 	0.6 	113
K0 	4720 	0.5 	96
K1 	4580 	0.4 	82
K2 	4460 	0.2 	70
K3 	4210 	0.1 	58
K4 	4010 	0.0 	45
K5 	3780 	-0.2 	32
M0 	3660 	-0.4 	15
M1 	3600 	-0.5 	13
M2 	3500 	-0.6 	11
M3 	3300 	-0.7 	9.5
M4 	3100 	-0.75 	7.4
M5 	2950 	-0.8 	5.1
M6 	2800 	-0.9 	3.3
 Supergiants (I)
Spectral Type	Temperature (K)	Absolute Magnitude	Luminosity (in solar luminosities)
B0 	21,000 	-6.4 	320,000
B1 	16,000 	-6.4 	280,000
B2 	14,000 	-6.4 	220,000
B3 	12,800 	-6.3 	180,000
B5 	11,500 	-6.3 	140,000
B6 	11,000 	-6.3 	98,000
B7 	10,500 	-6.3 	82,000
B8 	10,000 	-6.2 	73,000
B9 	9700 	-6.2 	61,000
A0 	9400 	-6.2 	50,600
A1 	9100 	-6.2 	44,000
A2 	8900 	-6.2 	40,000
A5 	8300 	-6.1 	36,000
F0 	7500 	-6 	20,000
F2 	7200 	-6 	18,000
F5 	6800 	-5.9 	16,000
F8 	6150 	-5.9 	12,000
G0 	5800 	-5.9 	9600
G2 	5500 	-5.8 	9500
G5 	5100 	-5.8 	9800
G8 	5050 	-5.7 	11,000
K0 	4900 	-5.7 	12,000
K1 	4700 	-5.6 	13,500
K2 	4500 	-5.6 	15,200
K3 	4300 	-5.6 	17,000
K4 	4100 	-5.5 	18,300
K5 	3750 	-5.5 	20,000
M0 	3660 	-5.3 	50,600
M1 	3600 	-5.3 	52,000
M2 	3500 	-5.3 	53,000
M3 	3300 	-5.3 	54,000
M4 	3100 	-5.2 	56,000
M5 	2950 	-5.2 	58,000
category:Science
category:Stellar Cartography