Alpha Cygni as a radial-velocity variable

Details Alpha Cygni as a radial-velocity variable Alpha Cygni as a radial-velocity variable

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987japa....8...51p&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 8, March 1987, p. 51-56.

Astronomy and Astrophysics

Astrophysics

1

Radial Velocity, Stellar Oscillations, Stellar Spectra, Supergiant Stars, Infrared Spectra, Near Infrared Radiation, Nitrogen, Variable Stars

Scientific paper

One hundred and twentythree radial velocities for α Cyg are derived between December 1977 and October 1982. These photospheric velocities are derived from N I 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 km s-1 observed in present radial velocities of α Cyg is close to the sum of the amplitudes (10.44 km s-1) of all the pulsation periods from 7 to 101 days and is also approximately equal to micro- and macro-turbulent velocities.

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