A massive helium star with a sufficiently strong magnetic field to form a magnetar

RectSpec_HD45166_Shenar2023.tar.gz :

Normalised LNA, FEROS, HERMES, and ESPADONS spectra associated with Shenar et al. 2023, Science (in press).

MJDs are provided in the file ObsDates.txt 

RVs_HD45166_Shenar2023.tar.gz:

RVs measured for the two components of HD 45166

zeeman2.1.f:

The Zeeman code, described in Landstreet 1988, AJ. 326, 967 (1988) and Wade et al. 2001, A&A, 374, 265

HERMES_raw_qWR.tar.gz: 

Raw HERMES fits files (dates are given in headers)

LC_TESS_qWR.tar.gz:

Reduced TESS light curves shown in Fig S7