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    • Keywords


      stars; radial velocities—supergiants—stars; pulsation

    • 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.

    • Author Affiliations


      M. Parthasarathy1 2 David L. Lambert1

      1. Department of Astronomy, University of Texas, Austin, Texas - 78712-1083, USA
      2. Indian Institute of Astrophysics, Bangalore - 560034
    • Dates

  • Journal of Astrophysics and Astronomy | News

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