CARBON ABUNDANCES AND MERIDIONAL MIXING IN RAPIDLY ROTATING EARLY-A STARS

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-proce...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1986-10, Vol.98 (608), p.927-934
Main Authors: LAMBERT, DAVID L., McKINLEY, LINDSAY K., ROBY, SCOTT W.
Format: Article
Language:English
Subjects:
Astronomy
Carbon
Carbon stars
Chemically peculiar stars
Earth, ocean, space
Exact sciences and technology
Normal stars (by class): general or individual
Rotational spectra
Spectroscopic binary stars
Stars
Stellar classification
Stellar rotation
Stellar spectra
Stellar spectral lines
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Summary: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.
ISSN:0004-6280
1538-3873
DOI:10.1086/131846