Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..259m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 1, 1985, p. 259-265.
Astronomy and Astrophysics
Astrophysics
24
H Alpha Line, Late Stars, Main Sequence Stars, Stellar Spectra, Variable Stars, Corotation, Emission Spectra, Luminosity, Radial Velocity, Star Clusters, Stellar Mass Ejection, Stellar Rotation, Stellar Winds
Scientific paper
H-alpha emission having a full width at its base of 700 km/s is observed in the main-sequence K star, H II 1883, confirming the report by Stauffer et al. (1984). Both the centroid and the width of the H-alpha emission vary synchronously with the 0.24 day rotation period of this Pleiades star. Based on the ratio H-alpha/H-beta, the absence of forbidden lines, and the inferred gas kinematics, this star must have an extended emission region of order one stellar radius in size. The periodic Doppler shifts of H-alpha probably arise from a wind with oppositely directed streams. If a significant fraction of the high-velocity material escapes from the star it will spin down in less than about 10 myr. This suggests that its remarkable properties may represent a natural, though transient stage in the evolution of late-type stars.
Cohen Ross D.
Duncan Douglas K.
Marcy Geo? W.
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