ob stars造句

• As the galactic plane passes through it, Serpens Cauda contains many massive OB stars.
• These appear as very hot OB stars, but only moderately luminous and below the main sequence.
• Ionizing radiation from the massive OB stars has created an H II region which has an hour-glass morphology.
• Four arc minutes distant are two other assumed members of the association, a 10th magnitude B0 giant and an 11th magnitude OB star.
• North of Messier 16, at a distance of approximately 2000 parsecs, is the OB association Serpens OB2, containing over 100 OB stars.
• "' OB stars "'are hot, massive stars of spectral types B that form in loosely organized groups called OB associations.
• The spiral arms are sites of ongoing star formation and are brighter than the surrounding disc because of the young, hot OB stars that inhabit them.
• Ultraviolet astronomy is best suited to the study of thermal radiation and spectral emission lines from hot blue stars ( OB stars ) that are very bright in this wave band.
• It is believed that runaway stars may be caused by supernovae, and there is strong evidence that OB stars ? Columbae, AE Aurigae and 53 Arietis all originated from such explosions in Ori OB1 2.2, 2.7 and 4.9 million years ago.
• Current models suggest that the matter density in the outer regions of the Solar System was too low to account for the formation of such large bodies from the traditionally accepted method of core protoplanetary disc and later had their atmospheres blasted away by radiation from a nearby massive OB star.
• The Cosmic Origins Spectrograph is designed to enable the observation of faint, point-like UV targets at moderate spectral resolution, allowing COS to observe hot stars ( OB stars, white dwarfs, cataclysmic variables and binary stars ) in the Milky Way and to observe the absorption features in the spectra of active galactic nuclei.