Multiple, short-lived "stellar prominences" on the O giant $ξ$ Persei: a magnetic star?

• DOI: 10.48550/arxiv.1711.02531
• Publication Date: 2017-01-01
• Authors: N. Sudnik; H. F. Henrichs
• Keywords: Solar prominence; Star (game theory)

We present strong evidence for a rotation period of 2.0406 d the O giant $ξ$ Persei, derived from NIV $λ$1718 wind line in 12 yr IUE data. predict that Per has magnetic dipole field, with superposed variable prominences. Favorable dates future measurements can be predicted. also analysed time-resolved He II 4686 spectra campaign 1989 by using same simplified model as before $λ$ Cephei, terms multiple spherical blobs attached to surface, called stellar prominences (Sudnik & Henrichs 2016). These represent transient loops on which we find lifetimes mostly less than 5 h.