Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216..125b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 125-134.
Astronomy and Astrophysics
Astrophysics
16
Binary Stars, Cepheid Variables, Stellar Orbits, Stellar Oscillations, Astronomical Photometry, Orbital Elements, Radial Velocity, Sagittarius Constellation
Scientific paper
Radial velocity observations of W Sgr obtained with the Coravel spectrovelocimeter between 1983 and 1988 are reported. It is shown that the dip broadening due to axial rotation and turbulence is well correlated with the variation of the acceleration of the stellar surface during the pulsation cycle, and that the dip area depends primarily on the effective temperature. Either a regular variation or a two-periods model may explain the period variation of W Sgr over the last century. The variation of the mean value of the pulsation radial velocity curve can be described by orbital motion with P = 1780 + or - 5 days, K = 2.35 + or - 0.47 km/s, and e = 0.52 + or - 0.14.
Babel Jacques
Burki Gilbert
Chmielewski Yves
Mayor Marcel
Waelkens Christoffel
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