Other
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..999f&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 999-1004.
Other
43
Light Curve, Stellar Oscillations, Supergiant Stars, Variable Stars, Cepheid Variables, Electrophotometry, Harmonic Oscillation, Hertzsprung-Russell Diagram, Radial Velocity, Stellar Color, Stellar Luminosity, Stellar Mass, Ubv Spectra
Scientific paper
Photometry of HD 161796 in 1980 reveals a low-amplitude (0.08 mag in V) sinusoidal variability of period 43d. Photometry of the previous year by Percy and Welch (1981) shows a variability of similar amplitude but with a 62d period, whereas photometry in 1981 showed the star constant to a level of + or - 0.005 mag or less for two months before breaking into oscillation again. It is noted that oscillations are neither built or up nor damped but appear at full amplitude immediately before and after cessation. The two periods observed, with a ratio of 0.69, are interpreted as the fundamental and first overtone modes of radial pulsation. If this is the case, then HD 161796 is unique among known variables in switching modes; in other stars only one mode is present or both are present simultaneously. It is shown that the fairly large radial velocity of HD 161796 is accounted for by ordinary differential galactic rotation. It does not suggest any high-velocity star characteristic.
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