Spectroscopic observations of yellow supergiants. I - Radial pulsations of Rho Cassiopeiae

Details Spectroscopic observations of yellow supergiants. I - Radial pulsations of Rho Cassiopeiae Spectroscopic observations of yellow supergiants. I - Radial pulsations of Rho Cassiopeiae

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..914s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Oct. 1986, p. 914-921.

Astronomy and Astrophysics

Astronomy

19

Radial Velocity, Stellar Oscillations, Stellar Spectra, Supergiant Stars, Variable Stars, Light Curve, Line Spectra, Stellar Evolution

Scientific paper

High-resolution Reticon spectra of the F8 Ia-0 supergiant ρ Cas providing lines of differing excitation potential are employed to construct radial-velocity curves which reveal a semiregular pulsation of the atmosphere. Analysis of line-doubling episodes supports the presence of a dominant radial pulsation mode with a period around 500 days, significantly longer than the radial fundamental mode predicted on the basis of Cepheid-like PLC relations for a star evolving to the red supergiant region. Predicted periods for fundamental radial pulsations in stars returning toward the blue supergiant region are comparable to the observed quasi-period.

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