Publication details

What’s New with Landstreet’s Star HD 37776 (V901 Ori)?

Authors

MIKULÁŠEK Zdeněk KRTIČKA Jiří SHULTZ M. E. HENRY G. W. PRVÁK Milan DAVID-URAZ A. JANÍK Jan ZEJDA Miloslav ROMANYUK I. I.

Year of publication 2020
Type Article in Proceedings
Conference Proceedings of the Polish Astronomical Society
MU Faculty or unit

Faculty of Science

Citation
Web https://www.pta.edu.pl/proc/v11p46
Keywords Landstreet's Star
Description HD 37776 (V901 Ori, B2 Vp), also known as Landstreet's Star, is possibly the most remarkable magnetic chemically peculiar (mCP) star known. Zeeman Doppler Imaging revealed this young, rapidly rotating star's surface magnetic field to be not only the strongest (about 30 kG) of the He-strong class of hot mCP stars but also by far the most topologically complex. In contrast to the overwhelming majority of mCP stars, which are well described by tilted dipoles, Landstreet's Star's non-axisymmetric surface magnetic field is entirely dominated by high-order spherical harmonics. It is one of the handfuls of stars for which rotational period change has been measured, and over the past two decades of monitoring, the object has demonstrated an unexpected acceleration in its rotation that so far defies explanation. Recently acquired TESS data have provided a photometric data set of unprecedented precision. These data have revealed a highly stable yet multi-featured light curve, making Landstreet’s Star the prototype of hot mCP stars whose light curves are difficult to reproduce using the standard model of chemical/photometric spots modulated by solid-body rotation.
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