General astronomy

General astronomy

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General astronomy

Aldebaran (alpha Tau, HR 1457)

Astronomy; General astronomy

A K5 III subgiant (a foreground star in the Hyades). It has a faint M2 V companion. It is now known to be slowly and irregularly variable.

AI Velorum star

Astronomy; General astronomy

A class of dwarf Cepheids. They are all RR Lyrae stars with periods shorter than 0.25 days.

Auger transition

Astronomy; General astronomy

A radiationless quantum jump that occurs in the X-ray region. When a K-electron is removed from an atom and an L-electron drops into the vacancy in the K-shell, the energy released in the latter ...

Ae star

Astronomy; General astronomy

A-type star with emission in one or several Balmer lines.

1) An eclipsing system of at least three components (B8 V, K0, Am). Period of components A and B is about 68.8 hours; period of components A, B, and C is about 1.9 years. Long term observations also ...

Avogadro number (NA)

Astronomy; General astronomy

The number of atoms in 12 grams of carbon 12. The number of atoms in a gram-atom (mass in grams numerically equal to the atomic weight) or the number of molecules in a gram-molecule (mass in grams ...