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CARBON ABUNDANCES AND MERIDIONAL MIXING IN RAPIDLY ROTATING EARLY-A STARS
DAVID L. LAMBERT, LINDSAY K. McKINLEY and SCOTT W. ROBY
Publications of the Astronomical Society of the Pacific
Vol. 98, No. 608 (October 1986), pp. 927-934
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40678785
Page Count: 8
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Carbon abundances are obtained from lines of C I at 9100 Å for 22 early-A main-sequence stars with projected rotational velocities of up to 180 km s⁻¹. The abundance shows no significant trend with increasing rotation. A preliminary conclusion is that meridional mixing currents do not bring CN-processed material into the atmospheres of these rotating A stars. Several carbon deficient stars are tentatively identified as chemically peculiar A stars. Future surveys should cover a sufficient wavelength interval to permit a spectral classification and a determination of the microturbulence.
Publications of the Astronomical Society of the Pacific © 1986 The University of Chicago Press