Pulsational mode-typing in line profile variables. II - rho Puppis and delta Scuti

Details Pulsational mode-typing in line profile variables. II - rho Puppis and delta Scuti Pulsational mode-typing in line profile variables. II - rho Puppis and delta Scuti

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..667c&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 667-673.

Astronomy and Astrophysics

Astrophysics

23

Cepheid Variables, Curve Fitting, Periodic Variations, Stellar Radiation, Variable Stars, Line Shape, Radial Velocity, Velocity Distribution

Scientific paper

The variations of high-resolution line profiles are modeled through the pulsation cycles of two delta Scuti-type variables, rho Puppis and delta Scuti. The results for rho Puppis, which show variations in radial velocity, but not in line shape, are unambiguous: radial pulsation (RP) fits the observations, while nonradial pulsation (NRP) does not fit. For delta Scuti the situation is more complex: although the radial-velocity changes are fitted well by RP, a 30% variation of line width through the cycle requires a small NRP component to the solution. The best fit consists of a two-mode radial/nonradial model having equal periods and a 2:1 velocity amplitude ratio.

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