Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..425y&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, May 1987, p. 425-438. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
9
Radial Velocity, Spectral Energy Distribution, Stellar Spectrophotometry, Variable Stars, Line Shape, Spectral Line Width, Stellar Temperature, Temperature Dependence, Temporal Resolution
Scientific paper
Precise differential radial velocities of the sharp-lined Delta Scuti variable Rho Pup (P = 3.37 hours) with a time resolution less than P/15 give a 2 K amplitude of 9.08 km/s for Ca II 8662 A and 8.35 km/s for H I 8750 A. The amplitudes for the Fe I, Si I, and S I velocities are 9.46, 9.23, and 9.41 km/s, respectively. The 2 K/delta m(v) value of 93 km/s per mag is typical of a radial pulsator. The line intensities of the stellar lines vary out of phase with the observed radial velocities, but closer in phase with the light curve. The amplitudes of the variations are between 0.3 percent and 1 percent of the continuum. Most lines are weaker near light maximum and stronger near light minimum. The variations correspond to the changes in spectral type associated with the variations of effective temperature over the pulsation cycle. A simple linear theory is developed in which the temperature dependence of both the stellar continuum opacity and line opacity are calculated.
Bennett Philip
Walker Gordon A. H.
Yang Sheng
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