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Jun-ichi Katahira, Ryuko Hirata, Masaki Ito, Mutsuhiko Katoh, Dominique Ballereau, Jacques Chauville, Period Analysis of the Radial Velocity in Pleione, Publications of the Astronomical Society of Japan, Volume 48, Issue 2, 1 April 1996, Pages 317–334, https://doi.org/10.1093/pasj/48.2.317
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A period analysis of the radial velocities of the shell lines in Pleione (B8e) was performed. We obtained a period of 218.0 days by combining the data in two successive shell phases. The orbital elements derived from the resulting velocity curve are: the eccentricity, e = 0.60; the semi-amplitude, K1 = 5.9 km s−1; the semi-major axis, a1 sin i = 20R⊙ and the mass function, ƒ(M) = 2.4·10−3M⊙. The secondary is most probably a low-mass dwarf, though we retain the possibility of a helium star or white dwarf. After examining the mass-loss rate from helium stars, we concluded that the circumstellar gas around the B8 primary is supplied from the primary, itself.