Astrophysics (index)about

A-type star

(A)
(type of star with about 2 times the mass of the Sun)

An A-type star is a star in the A-class, a spectral class for stars of around 2 solar masses and 2 times solar radius. They burn up their hydrogen in a few hundred million years. They have strong hydrogen absorption lines. Characteristics:

whiteconventional color
7500-9500Ksurface temperature
1.7-2.7radius(solar)
1.6-2.9mass(solar)
1.5-2.4absolute magnitude(visual)
9-24bolometric luminosity(solar)
.5-1.2 billion yearsmain-sequence lifetime
.6%abundance

(star type,spectral type)
http://en.wikipedia.org/wiki/Stellar_classification
WaveLFreqPhoton
Energy
  
145nm2.1PHz8.6eVbeginA-type star
290nm1.1PHz4.3eVendA-type star

Referenced by:
Am star
Ap star
Balmer jump
Balmer-break galaxy (BBG)
Be star
globular cluster (GC)
Hyades Cluster
Markarian galaxy (Mkn)
Morgan classification
RR Lyrae variable
star formation rate (SFR)
spectral class
SS 433
velocity-metallicity relation

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