Periodicity and pulsational mode of five bright yellow supergiants

Details Periodicity and pulsational mode of five bright yellow supergiants Periodicity and pulsational mode of five bright yellow supergiants

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..571a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Oct. 1, 1985, p. 571-587. CONACYT-NSERC-supported

Astronomy and Astrophysics

Astronomy

27

Radial Velocity, Stellar Oscillations, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Light Curve, Stellar Luminosity, Stellar Mass

Scientific paper

Five yellow supergiant variables with long semiperiodic variation (P approximately greater than 40 day) have been studied. UBVRI photometry and radial velocities were obtained during the same observing seasons. These observations together with previous data in the literature were used to determine the characteristic time of the variation. Empirical masses, radii and pulsation constants Q were determined. A discussion of the expected values of Q for fundamental radial pulsation in large and massive stars allow a discussion on the pulsation mode of the stars in the sample. Epsilon Aur, V509 Cas and Rho Cas are likely nonradial pulsators, massive (M/solar-M = 15-30) and large (R/solar-R = 250-800). For 89 Her, arguments are offered in favor of a non-pure radial pulsational behavior. For HD161796 a new periodic switch from 43 days in early 1981 to 62 days in 1982 was found. High luminosity (Mv = -8 to -9) and mass (M = 14 to 24 solar mass) are consistent with radial pulsation as suggested by the period switches observed in 1979-1980 and 1981-1982.

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