First science results with a new, inexpensive liquid crystal polarimeter module for the DAO 1.8m telescope

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Proceedings titleStellar polarimetry : from birth to death
Series titleAIP Conference Proceedings; no. 1429
ConferenceStellar Polarimetry: From Birth to Death, June 27–30, 2011, Madison, WI, USA
Pages240243; # of pages: 4
AbstractA new polarimeter module has been built for the Dominion Astrophysical Observatory's (DAO) 1.8m Plaskett telescope for a hardware cost, including spare components, of approximately CDN$5,000. Implemented as a plug-in addition to the telescope's existing Cassegrain spectrograph, the device is being used to obtain medium resolution (R ≈ 10;000) circular spectropolarimetry of stars in an approximately 280Å wide wavelength region centered on the Hβ line. The intermediate resolution of the spectrograph permits stellar longitudinal magnetic field measurements to be made with both single or multiple strong metallic lines as well as the Hβ line. The instrument's dual-beam design together with fast switching of the liquid crystal wave plate (up to 100 Hz) synchronized with charge shuffling on the CCD is used to significantly reduce instrumental effects and achieve high precision polarimetric measurements. In this paper we present the first new science results obtained with the instrument. These include the discovery of a strong magnetic field and co-rotating magnetosphere in the helium-weak star HD176582, the detection of several new magnetic stars, and a study of the observed (and occasionally very large) differences in stellar longitudinal magnetic fields as measured with the Hβ line and metallic lines.
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AffiliationNational Science Infrastructure; National Research Council Canada
Peer reviewedYes
NPARC number21269042
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Record identifier01576917-e7d5-46d8-9378-eab5bffcd3d0
Record created2013-12-02
Record modified2016-05-09
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