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J/A+A/341/818       s-Cepheid velocity curves   (Kienzle+, 1999)

Structural Properties of s-Cepheid Velocity Curves. Constraining the location of the ω4=2ω1 resonance. Kienzle F., Moskalik P., Bersier D, Pont F. <Astron. Astrophys. 341, 818 (1999)> =1999A&A...341..818K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Radial velocities Keywords: techniques: radial velocities - stars: oscillations - stars: variables: Cepheids Description: The light curves of the first overtone Pop. I Cepheids (s-Cepheids) show a discontinuity in their φ21 vs. P diagram, near P=3.2day. This feature, commonly attributed to the 2:1 resonance between the first and the fourth overtones (ω4∼2ω1), is not reproduced by the hydrodynamical models. With the goal of reexamining the resonance hypothesis, we have obtained new CORAVEL radial velocity curves for 14 overtone Cepheids. Together with 10 objects of Krzyt et al. (1999, in prep.), the combined sample covers the whole range of overtone Cepheid periods. The velocity Fourier parameters display a strong characteristic resonant behavior. In striking contrast to photometric ones, they vary smoothly with the pulsation period and show no jump at 3.2day. The existing radiative hydrodynamical models match the velocity parameters very well. The center of the ω4=2ω1 resonance is estimated to occur at Pr=4.58±0.04day, i.e. at a period considerably longer than previously assumed (3.2day). We identify two new members of the s-Cepheid group: MY Pup and V440 Per. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 193 16 Fourier parameters of cepheids data.dat 32 715 Individual CORAVEL velocities
See also: J/A+AS/108/9 : Cepheids fundamental parameters I. (Bersier+, 1994) J/A+AS/108/25 : Cepeheids fundamental parameters II. (Bersier+, 1994) J/A+A/305/551 : Chemical composition of the s-Cepheids (Andrievsky+, 1996) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- STAR Star name according to GCVS 10- 17 F8.6 d Period Period 19- 26 F8.6 d e_Period One sigma error Period 28- 29 I2 --- M Number of data points 31 I1 --- N Number of harmonics fitted 33- 37 F5.3 km/s sigma RMS of the residuals 39- 45 F7.3 km/s A0 Gamma velocity 47- 51 F5.3 km/s e_A0 One sigma error gamma velocity 53- 58 F6.3 km/s A1 Amplitude A1 60- 64 F5.3 km/s e_A1 One sigma error amplitude A1 66- 70 F5.3 --- R21 Amplitude ratio A2/A1 72- 76 F5.3 --- e_R21 One sigma error amplitude ratio R21 78- 82 F5.3 --- f21 Phase shift phi2-2*phi1 84- 88 F5.3 --- e_f21 One sigma error phase shift f21 90- 95 F6.3 --- R31 ?=-9.999 Amplitude ratio A3/A1 97-102 F6.3 --- e_R31 ?=-9.999 One sigma error amplitude ratio R31 104-109 F6.3 --- f31 ?=-9.999 Phase shift phi3-3*phi1 111-116 F6.3 --- e_f31 ?=-9.999 One sigma error phase shift f31 118-123 F6.3 --- R41 ?=-9.999 Amplitude ratio A4/A1 125-130 F6.3 --- e_R41 ?=-9.999 One sigma error amplitude ratio R41 132-137 F6.3 --- f41 ?=-9.999 Phase shift phi4-4*phi1 139-144 F6.3 --- e_f41 ?=-9.999 One sigma error phase shift f41 146-151 F6.3 --- R51 ?=-9.999 Amplitude ratio A5/A1 153-158 F6.3 --- e_R51 ?=-9.999 One sigma error amplitude ratio R51 160-165 F6.3 --- f51 ?=-9.999 Phase shift phi5-5*phi1 167-172 F6.3 --- e_f51 ?=-9.999 One sigma error phase shift f51 174-175 I2 h RAh Right Ascension J2000 (hours) (1) 177-178 I2 min RAm Right Ascension J2000 (minutes) (1) 180-183 F4.1 s RAs Right Ascension J2000 (seconds) (1) 185 A1 --- DE- Declination J2000 (sign) (1) 186-187 I2 deg DEd Declination J2000 (degrees) (1) 189-190 I2 arcmin DEm Declination J2000 (minutes) (1) 192-193 I2 arcsec DEs Declination J2000 (seconds) (1)
Note (1): columns added at CDS, values from SIMBAD data-base.
Byte-by-byte Description of file: data.dat
Bytes Format Units Label Explanations
1- 8 A8 --- STAR Star name according to GCVS 10- 20 F11.3 d HJD Heliocentric julian day 22- 27 F6.2 km/s RV Radial velocity 29- 32 F4.2 km/s e_RV One sigma error
Acknowledgements: Francesco Kienzle References: Krzyt, T., Moskalik, P., Gorynya, et al., 1999, (in preparation)
(End) Patricia Bauer [CDS] 23-Oct-1998
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