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Proceedings Paper

DeSSpOt: an instrument for stellar spin orientation determination
Author(s): Anna-Lea Lesage; Magnus Schneide; Günter Wiedemann
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Paper Abstract

We designed and constructed a special instrument to enable the determination of the stellar's spin orientation. The Differential image rotator for Stellar Spin Orientation, DeSSpOt, allows the simultaneous observations of two anti-parallel orientations of the star on the spectrum. On a high resolution ´echelle spectrum, the stellar rotation causes a slight line tilt visible in the spatial direction which is comparable to a rotation curve. We developed a new method, which exploits the variations in these tilts, to estimate the absolute position angle of the rotation axis. The line tilt is retrieved by a spectroastrometric extraction of the spectrum. In order to validate the method, we observed spectroscopic binaries with known orbital parameters. The determination of the orbital position angle is equivalent to the determination of the stellar position angle, but is easier to to detect. DeSSpOt was successfully implemented on the high resolution Coud´e spectrograph of the Th¨uringer Landessternwarte Tautenburg. The observations of Capella led to the determination of the orbital position angle. Our value of 37.2° is in agreement with the values previously found in the literature. As such we verified that both method and instrument are valid.

Paper Details

Date Published: 24 September 2012
PDF: 12 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84463W (24 September 2012); doi: 10.1117/12.925345
Show Author Affiliations
Anna-Lea Lesage, Hamburger Sternwarte (Germany)
Magnus Schneide, Hamburger Sternwarte (Germany)
Günter Wiedemann, Hamburger Sternwarte (Germany)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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