A “flash spectrum” of cool absorption in 31 CYGNI: A direct observation of the reversing layer?
We report the discovery of narrow absorption lines due to low temperature ions, äpparantly in the “reversing layer” of the supergiant component of a zeta Aur type binary. We have measured the radial velocities and equivalent widths of thirteen of these lines near ingress and egress and find a three sigma upper limit on the rotational velocity of the supergiant along the line of sight of 6 km/s.
KeywordsRadial Velocity Rotational Velocity Equivalent Width Systemic Velocity Local Interstellar Medium
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