Other
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..155g&link_type=abstract
Astrophysical Journal, Part 1, vol. 251, Dec. 1, 1981, p. 155-161. Research supported by the Natural Sciences and Engineering R
Other
45
Deceleration, G Stars, Giant Stars, Late Stars, Stellar Rotation, Turbulence, Angular Velocity, Braking, Emission Spectra, Spectrographs, Stellar Mass
Scientific paper
Measurements of rotation rates and turbulence parameters are presented for five G-type giant stars. Fourier transform analysis was applied to all possible lines in spectra taken between 6122 and 6270 A for the G5 III stars Tau Persei, Beta Leporis, Omicron Ursa Majoris, Beta Corvi and Epsilon Ursa Minoris. Rotation rates, found by comparison of the mean residual transforms of all lines of a given star following removal of instrumental and microturbulence profiles with model transforms, reveal all but Epsilon UMi to be slow rotators, requiring the presence of a rotational brake. Epsilon UMi, with a rotation rate of 27 km/sec, is suggested to be presently undergoing the stage of rapid rotational braking, which will reduce its rotation to about 5 km/sec, whereas the other G giants have already passed through that stage. Macroturbulence is found to be on the order of 7 km/sec in the G giants, which is markedly higher than in K giants and in agreement with the temperature dependence of nonradial oscillations.
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