Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141..328n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 2, Dec. 1984, p. 328-340. Research supported by the Swiss National Sc
Astronomy and Astrophysics
Astrophysics
20
A Stars, Peculiar Stars, Stellar Rotation, Astronomical Catalogs, Astronomical Photometry, Periodic Variations, Silicon, Stellar Magnetic Fields
Scientific paper
Photometric periods of silicon stars belonging to clusters and associations as well as to the field are discussed in relation with theories of magnetic braking taking place on the main sequence. It is shown that Si stars do not lose the bulk of their angular momentum during their main-sequence lifetime, but must have lost it before. Any braking mechanism which predicts an e-folding time of the order of, or shorter than, the star's lifetime seems ruled out. The theory of purely hydromagnetic rotational braking is much too efficient to fit the observations (unless under its earlier form proposed by Kulsrud, 1971), while the accretion theory does not fit them either, although it seems more realistic. Preinjection of cosmic rays by means of Ap stars appears doubtful.
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