A-type main-sequence star | Wikipedia audio article
Channel: wikipedia tts
Date: 17/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/A-type_main-sequence_star


00:00:57 1 Spectral standard stars
00:02:56 2 Planets
00:04:47 3 List of stars
00:04:57 4 See also



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SUMMARY
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An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen-burning) star of spectral type A and luminosity class V. These stars have spectra which are defined by strong hydrogen Balmer absorption lines. They have masses from 1.4 to 2.1 times the mass of the Sun and surface temperatures between 7600 and 10,000  K. 
Bright and nearby examples are Altair (A7 V), Sirius A (A1 V), and Vega (A0 V). A-type stars don't have a convective zone and thus aren't expected to harbor a magnetic dynamo. As a consequence, because they don't have strong stellar winds they lack a means to generate X-ray emission.