Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..165n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 1, July 1985, p. 165-168. SNSF-supported research.
Astronomy and Astrophysics
Astrophysics
12
A Stars, Peculiar Stars, Stellar Evolution, Magnetic Dipoles, Silicon, Spectral Line Width, Stellar Magnetic Fields, Stellar Rotation, Stellar Spectra
Scientific paper
Gravities deduced from Geneva photometry are used in connection with published magnetic data, rotational periods, and equivalent widths of silicon lines. The distribution of the obliquity angles appears to be random on the ZAMS but becomes increasingly bimodal as evolution proceeds. No evidence of magnetic braking is found, so that slow rotation is linked with stellar formation only. The equivalent width of Si lines seems constant for stars with a mass greater than 3 solar masses but may decrease with decreasing log g for lower mass stars.
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