Astrophysics (index)

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 mass and 2 times solar radius. They burn up their Hydrogen (H) in a few hundred million years. They have strong hydrogen Absorption Lines. Characteristics:

whiteConventional color
7500-9500KSurface Temperature
1.7-2.7Radius
1.6-2.9Mass
1.5-2.4Absolute Magnitude (M)(visual)
9-24Luminosity (L)(bolometric)
.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:
Ap Star
Balmer Jump
Balmer-Break Galaxy (BBG)
Be Star
Globular Cluster (GC)
Markarian Galaxy (Mkn)
Star Formation Rate (SFR)
Spectral Class

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