early-type star


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early-type star

n
(Astronomy) astronomy any massive hot star of spectral type O, B, or A. Compare: late-type star
[C20: from the mistaken belief that hot and old stars evolved into cool young stars]
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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.
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.