Abstract
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.
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References
Ahmad, I.A. 1986, Ap.J., 301, 275.
Ahmad, I.A. 1987, Bull. A.A.S., 19, 707.
Kelly, R.L., and Palumbo, L.J. 1973, Atomic and Ionic Emission Lines Below 2000 Angstroms (Washington, D.C.: NRL).
Wright, K.O. 1970, Vistas in Astr., 12, 147.
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Ahmad, I.A. (1987). A “flash spectrum” of cool absorption in 31 CYGNI: A direct observation of the reversing layer?. In: Linsky, J.L., Stencel, R.E. (eds) Cool Stars, Stellar Systems, and the Sun. Lecture Notes in Physics, vol 291. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-18653-0_151
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DOI: https://doi.org/10.1007/3-540-18653-0_151
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