Weak magnetic fields of intermediate-mass stars

Details Weak magnetic fields of intermediate-mass stars Weak magnetic fields of intermediate-mass stars

2011-09-30

arxiv.org/abs/1109.6888v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Submitted to Astronomical Notes (proceedings of the 7th Potsdam Thinkshop on "Magnetic Fields in Stars and Exoplanets")

Scientific paper

We present the result of a highly sensitive spectropolarimetric study dedicated to intermediate mass stars. We report the detection of sub-gauss surface magnetic fields on the normal, rapidly-rotating A-type star Vega and on the moderately-rotating Am star Sirius A. These magnetic detections constitute the first evidence that tepid stars that do not belong to the class of Ap/Bp stars can also host magnetized photospheres, suggesting that a significant fraction of stars in this mass regime are magnetic. We present here the observational clues gathered so far to progress towards understanding the physical processes at the origin of this newly identified Vega-like magnetism.

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