Other
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..576f&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Jan. 15, 1981, p. 576-582.
Other
41
Stellar Oscillations, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Light Curve, Milky Way Galaxy, Radial Velocity, Stellar Luminosity, Stellar Magnitude, Stellar Motions, Ubv Spectra
Scientific paper
The 89 Herculis demonstrated light and color curves similar to the 68(d) pulsation based on the BVRI and radial velocity observations during 1977, 1978, and 1979. A well-developed light curve in 1978 was suddenly replaced by low-amplitude fluctuations with greater changes in radial velocity; no light curve was measured in 1979, except for random fluctuations. Nonradial pulsation may account for these changes; large color effects suggested by Gillett, Hyland, and Stein (1970) from infrared results were observed, but radial velocities over 60 yr do not confirm Humphreys and Ney (1974) that 89 Herculis may be a binary. The space motion of this star resembles that of a typical high-velocity planet directed outward radially through the Galaxy at 130 km/s; however, it cannot be explained how Herculis could attain normal population abundances and have a well-determined M(v) = -6.8, which is more luminous than any other halo population star.
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