Doppler Imaging of starspots on young solar analogues is a way to investigate the early history of solar magnetic activity by proxy. Doppler images of young G-dwarfs have yielded the presence of large polar spots, extending to moderate latitudes, along with measurements of the surface differential rotation. The differential rotation measurement for one star (RX J0850.1- 7554) suggests it is possibly the first example of a young G-type dwarf whose surface rotates as almost a solid body, in marked contrast to the differential rotation of other rapidly rotating young G-dwarfs and the present-day Sun. Overall, our Doppler imaging results show that the young Sun possessed a fundamentally different dynamo to today.
@article{arxiv.1310.6517,
title = {Starspots on Young Solar-Type Stars},
author = {Carolyn Brown and Brad Carter and Stephen Marsden and Ian Waite},
journal= {arXiv preprint arXiv:1310.6517},
year = {2015}
}
Comments
2 pages, 1 figure, to appear in the proceedings of the IAUS302 "Magnetic fields throughout stellar evolution"