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- W3098999020 abstract "The ON stars are a rare subtype of O stars, of uncertain origin. We report two new, rapidly-rotating ON stars found in data acquired with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST. LS I +61 28 is an ON8.5 Vn dwarf with a projected equatorial rotational velocity of $v_{textrm e}sin{i} simeq 298$ km$;$s$^{-1}$, while HDE 236672 is an ON9 IVn subgiant with $v_{textrm e}sin{i} simeq 253$ km$;$s$^{-1}$ The former is the first rapidly-rotating ON dwarf to be found, and the latter is only the third ON subgiant. The luminosity classes of non-supergiant ON stars appear to be influenced by the axial inclination angle $i$: the rapidly-rotating giants are close to equator-on, while ON dwarfs with lower $v_{textrm e}sin{i}$ values are viewed more nearly pole-on. Combining parallaxes and proper motions from Gaia DR2 with radial-velocity measurements, we investigate the kinematics of non-supergiant ON stars, and infer that the dynamics, rapid rotation, and surface-nitrogen characteristics may all be consequences of binary interaction." @default.
- W3098999020 created "2020-11-23" @default.
- W3098999020 creator A5078510529 @default.
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- W3098999020 date "2020-01-10" @default.
- W3098999020 modified "2023-09-27" @default.
- W3098999020 title "Two New Rapidly Rotating ON Stars Found with LAMOST" @default.
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- W3098999020 doi "https://doi.org/10.3847/1538-4357/ab5b01" @default.
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