Abstract
One hundred and twentythree radial velocities for α Cyg are derived between December 1977 and October 1982. These photospheric velocities are derived from NI lines near 8700 å. Semiregular variations in radial velocities are present with periods of 7 to 20 days. The range of variation of 14.3 kms−1 observed in the present radial velocities of α Cyg is close to the sum of the amplitudes (10.44 kms−1) of all the pulsation periods from 7 to 101 days (Lucy 1976a) and is also approximately equal to micro and macro-turbulent velocities.
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Parthasarathy, M., Lambert, D.L. Alpha Cygni as a radial-velocity variable. J Astrophys Astron 8, 51–56 (1987). https://doi.org/10.1007/BF02714251
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DOI: https://doi.org/10.1007/BF02714251