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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 193 16 Fourier parameters of cepheids
data.dat 32 715 Individual CORAVEL velocities
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): columns added at CDS, values from SIMBAD data-base.
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Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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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
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Acknowledgements: Francesco Kienzle
References:
Krzyt, T., Moskalik, P., Gorynya, et al., 1999, (in preparation)
(End) Patricia Bauer [CDS] 23-Oct-1998