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Search for Magnetic Fields in Vega, Gamma Geminorum, and Sirius

Published online by Cambridge University Press:  12 April 2016

Masahide Takada-Hidai  and
Jun Jugaku
Masahide Takada-Hidai
Affiliation:
Research Institute of Civilization, Tokai University1117 Kitakaname, Hiratsuka, Kanagawa, 259-12JapanE-mail(Internet):[email protected]@C1.MTK.NAO.AC.JP
Jun Jugaku
Affiliation:
Research Institute of Civilization, Tokai University1117 Kitakaname, Hiratsuka, Kanagawa, 259-12JapanE-mail(Internet):[email protected]@C1.MTK.NAO.AC.JP

Abstract

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Magnetic fields in Vega, ϒ Geminorum, and Sirius are searched by using empirical and theoretical relations of magnetic-field strength to the relative differences between the equivalent widths of each pair of the two Fe II lines near 6150 and 4400 Å. We estimated the possible strengths of their magnetic fields as follows: 0.0 kG or 2.5 – 3.5 kG for Vega, 0 – 2 kG or 2.8 – 3.0 kG for ϒ Gem, and 0.0 kG or ∼ 2(?) – 2.5 kG for Sirius. The empirical relation yields the former value in each star, which is consistent with those determined through polarization measurements, while the theoretical relation the latter with systematically large values.

Type
II. Magnetic Fields: Observations and Theories
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 310 - 314
Copyright
Copyright © Astronomical Society of the Pacific 1993

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