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
TW Hydrae association (TWA)
velocity-metallicity relation

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