early-type stars

early-type stars

Hot stars of spectral type O, B, and A. They were originally thought, wrongly, to be at an earlier stage of evolution than late-type stars.
References in periodicals archive ?
Morgan and others investigated the distribution in distance of luminous early-type stars along the Milky Way, and the first vestiges of spiral arms became discernible.
The remaining sources include photospheres and winds of the massive and hot early-type stars, cataclysmic variables, active galactic nuclei (AGNs), and such unique objects as the Vela supernova remnant, Cygnus Loop, and Jupiter-Io torus.
As shown in the plot at left, the brightness contrast is roughly [10.sup.-7] to [10.sup.-9] for Earth-like planets around M dwarf stars such as Proxima Centauri or Barnard's star; about [10.sup.-10] for those around Sun-like stars such as Alpha Centauri, Tau Ceti, or Epsilon Eridani; and about [10.sup.-11] for those around intensely bright, early-type stars such as Procyon and Altair.