Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115...30b&link_type=abstract
Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 30-38. Research supported by the Swiss National Science Foundation.
Astronomy and Astrophysics
Astrophysics
32
Cepheid Variables, Radial Velocity, Stellar Spectrophotometry, Electrophotometry, Light Curve, Spectral Line Width
Scientific paper
The radial velocities of HD 9250 and HD 14662 were measured 52 and 60 times, respectively, with the spectrophotometer CORAVEL (Baranne et al., 1979) from the Geneva station at the Haute-Provence Observatory (France) between Janunary 1978 and February 1981. From the Gornergrat and Jungfraujoch observatories (Switzerland) between October 1971 and February 1981, HD 9250 was observed 32 times and HD 14662 35 times in the Geneva photometric system. An analysis of these photoelectric measurements in photometry and radial velocity is presented. The width of the CORAVEL dip is found to vary with the pulsation phase; here, the broadening of the photospheric lines reaches a maximum about 0.1 in phase before the minimum radius. It is pointed out that the geometrical effect resulting from the radial pulsation cannot explain this variation. Another broadening mechanism, probably the turbulence, is found to vary with the pulsation phase.
Benz Willy
Burki Gilbert
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