Statistics – Computation
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..152g&link_type=abstract
Astrophysical Journal, Part 1, vol. 251, Dec. 1, 1981, p. 152-154. Research supported by the Natural Sciences and Engineering R
Statistics
Computation
32
Binary Stars, Fourier Analysis, Spectral Line Width, Stellar Spectra, Stellar Spectrophotometry, White Dwarf Stars, Plasma Turbulence, Spectrum Analysis, Stellar Luminosity, Stellar Rotation
Scientific paper
A Fourier analysis is presented of the line broadening of Procyon, a bright star of spectral type F5-Iv-V which may be useful as a reference star of intermediate spectral type. The 34 lines used in the analysis were observed in spectral regions centered on 6160 and 6250 A, represent eight chemical species and are generally of weak to intermediate strength. The analysis involved the computation of the individual line profiles, the removal of instrumental and thermal microturbulence profiles, and the averaging of the residual transforms. The microturbulence dispersion of the individual profiles are observed to increase rapidly with excitation potential above 3.5 eV, which may be interpreted as a depth effect. The mean residual transform of the 34 lines is best fit with a radial-tangential macroturbulence dispersion of 7.0 + or - 0.1 km/sec, and a projected rotation rate of 2.8 + or 0.3 km/sec.
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