The magnetic fields of the helium-weak B stars

Details The magnetic fields of the helium-weak B stars The magnetic fields of the helium-weak B stars

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...53..151b&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 53, Sept. 1983, p. 151-167. Research supported by the national Re

Astronomy and Astrophysics

Astrophysics

111

Abundance, B Stars, Early Stars, Horizontal Branch Stars, Peculiar Stars, Stellar Magnetic Fields, A Stars, Helium, Stellar Evolution, Stellar Temperature

Scientific paper

A survey of magnetic fields in 30 helium-weak B stars, one horizontal-branch B star, and one sdOB star has been conducted. Typical measurement errors for the He-weak stars are in the range of 100-400 gauss, and fields have been detected or confirmed in 12 stars, nine of which are known to belong to the Si and Sr-Ti He-weak spectroscopic subclasses. He-weak stars of these subclasses thus share with Ap stars and the He-strong stars the property of commonly showing detectable magnetic fields. However, the present observations are consistent with the view that the P-Ga He-weak stars are hotter analogs of the (nonmagnetic) Hg-Mn Ap stars, since none of the four P-Ga stars observed show detectable fields. The fraction of He-weak stars showing large fields appears to be larger than for Ap stars but smaller than for He-strong stars.

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