X-Ray Flare in HD 27130

R. A. Stern and J. H. Underwood, Jet Propulsion Laboratory; and S. K. Antiochos, Stanford University, guest observers with the Einstein Observatory, write: "The 0.3-6.0-nm x-ray flux from the Hyades binary system HD 27130 underwent a 40-fold increase to 10**24 J/s shortly before 1980 Sept. 20d06h13m UT. This flare decayed with an e-foldlng time of ~ 2500 s. HD 27130 has been determined recently to be a double-lined eclipsing binary with a period of 5.6 days. The primary is a main-sequence G star, while the secondary is probably a K dwarf (R. McClure, private communication). Monitoring of this system for evidence of optical flaring or unusual spectral characteristics would be valuable."