HD144941 is an evolved early-type metal-poor low-mass star with a hydrogen-poor surface. It is frequently associated with other intermediate helium-rich subdwarfs and extreme helium stars. Previous photometric studies have failed to detect any variability. New observations with the K2 mission show complex but periodic variations with a full amplitude of 4 parts per thousand. It is proposed that these are due to an inhomogeneous surface brightness distribution (spots) superimposed on a rotation period of 13.9+/-0.2 d. The cause of the surface inhomogeneity is not identified, although an oblique dipolar magnetic field origin is plausible.
@article{arxiv.1801.10226,
title = {K2 spots rotation in the helium star HD144941},
author = {C. Simon Jeffery and Gavin Ramsay},
journal= {arXiv preprint arXiv:1801.10226},
year = {2018}
}