- 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. They measure between 1.4 and 2.1 solar masses (M☉) and have surface temperatures between 7,600 and 10,000 K. 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.
- Vindemiatrix (stars.astro.illinois.edu)
VINDEMIATRIX (Epsilon Virginis). Just over the line into third magnitude (2.83) and third brightest in the constellation Virgo following first magnitude Spica (the Alpha star) and Porrima (Gamma), Vindemiatrix still wound up with Bayer’s Epsilon designation.