Statistics – Computation
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320l.139w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. L139-L143. NSERC-supported
Statistics
Computation
40
Absorption Spectra, Cepheid Variables, Harmonic Motion, Oscillations, Scutum Constellation, Stellar Rotation, Cassiopeia Constellation, Computational Astrophysics, Line Spectra, Perturbation Theory, Phase Velocity, Stellar Luminosity
Scientific paper
The authors obtained time-resolved spectral series covering a single photometric period in the region of λ4500 for four rapidly rotating (≡120 km s-1) δ Scuti stars. In all four cases the line profiles show the unmistakable signature of traveling subfeatures already seen in Spica and ζ Ophiuchi, where they have been attributed to high-degree nonradial pulsations. On the simplifying assumption that the subfeatures are periodic and can be ascribed to a nonradial, spherical harmonic motion with l = |m|, and that stellar rotation dominates the acceleration, the authors calculate values of |m| = 8, 14, 16, 16 for 21 Mon, κ2Boo, υ UMa, ο1Eri, respectively.
Fahlman Gregory G.
Walker Gordon A. H.
Yang Sheng
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