Back نجوم النسق الأساسي من النوع A Arabic Estrella blanca de la seqüència principal Catalan Estrella blanca de la secuencia principal Spanish Sekuentzia nagusiko izar zuri Basque A-tyypin pääsarjan tähti Finnish Étoile blanche de la séquence principale French Estrela branca da secuencia principal Galician Bintang deret utama tipe-A ID Stella di classe A V Italian A型主系列星 Japanese

A-type main-sequence star

See also: Stellar classification § Class A
An artist's impression of Sirius A and Sirius B, a binary star system. Sirius A, an A-type main-sequence star, is the larger of the two.

An A-type main-sequence star (AV) or A dwarf star is a main-sequence (hydrogen burning) star of spectral type A and luminosity class V (five). These stars have spectra defined by strong hydrogen Balmer absorption lines.[1] They measure between 1.4 and 2.1 solar masses (M☉) and have surface temperatures between 7,600 and 10,000 K, meaning they live around 4.3 to 1.6 billion years. Bright and nearby examples are Altair (A7), Sirius A (A1), and Vega (A0). A-type stars do not have convective zones and thus are not expected to harbor magnetic dynamos. As a consequence, because they do not have strong stellar winds, they lack a means to generate X-ray emissions.

  1. ^ "Stellar Spectral Types". hyperphysics.phy-astr.gsu.edu. Retrieved June 19, 2007.

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