Astrophysics (index)about

main sequence star

(dwarf star)
(star burning hydrogen into helium)

A main sequence star is a star in the phase of burning hydrogen into helium, through the proton-proton chain or the CNO cycle, i.e., the main sequence. Such stars fit on a narrow diagonal region (roughly a line) on an H-R diagram, the region/line also being referred to as the main sequence. For many stars, this is the majority of their fusion lifetime, e.g., billions of years for a star such as the Sun.

(The term main sequence star is also sometimes used in a general way for a star that has or will have a main sequence in its lifetime, even if it is before or after this phase, excluding, for example, brown dwarfs.)

The term dwarf star actually refers to any star that is not a giant star, basically a main sequence star (though white dwarves might be meant as well).

(star type,stellar evolution,H-R diagram)

Referenced by:
A-type star (A)
asymptotic giant branch (AGB)
Algol (Beta Per)
B-type star (B)
bolometric correction
brown dwarf (BD)
cosmic dust
evolutionary track
extra-solar planet
F-type star (F)
51 Pegasi b (51 Peg b)
galactic binary
galaxy main sequence
G-type star (G)
G-dwarf problem
giant star
globular cluster (GC)
hydrogen burning
HR 8799
H-R diagram (HRD)
Hyades Cluster
instability strip
K-type star (K)
Kepler Telescope
Kelvin-Helmholtz mechanism
luminosity class
main sequence fitting
mass-luminosity relation
mass-radius relation
M-type star (M)
O-type star (O)
post-common envelope binary (PCEB)
pre-main-sequence star (PMS)
post main sequence star
proton-proton chain
red giant
red-giant branch (RGB)
Schönberg-Chandrasekhar limit
spectral class
stellar core
stellar evolution
stellar luminosity determination
stellar remnant
substellar object
timescale (t)
turn-off point (TO)
Vogt-Russell theorem
white dwarf
zero-age main sequence (ZAMS)