Other
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99.1277s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Dec. 1987, p. 1277-1287.
Other
12
Line Shape, Periodic Variations, Spectrum Analysis, Stellar Color, Stellar Spectrophotometry, Supergiant Stars, Hot Stars, Radial Velocity
Scientific paper
The authors discuss optical spectra obtained over the decade 1977 to 1986 and find complex variations in radial velocity and in Fe I emission intensity. Power spectra of core velocities of high-excitation N I lines reveal two significant peaks, at 421 days and at 315 days. A bimodal radial pulsation for HR 8752 is inferred. Possible longer periods may involve other modes and/or an orbital period due to the hot companion of the supergiant. Short-term quasi-periodic variability in V and in (B-V) supports the pulsation scenario with its dominant time scale of 420 days. Various observables set the behavior of HR 8752 apart from that of ρ Cas. This may be due to evolutionary or environmental effects, or both.
Lambert David L.
Sheffer Yaron
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