J/A+AS/140/79 Radii of 22 galactic Cepheids (Imbert, 1999)
Determination of the radii of Cepheids.
V. Radial velocities and dimensions of 22 galactic Cepheids
(Determination des rayons de Cepheides. V. Vitesses radiales et dimensions de 22
Cepheides galactiques)
Imbert M.
<Astron. Astrophys. Suppl. Ser. 140, 79 (1999)>
=1999A&AS..140...79I 1999A&AS..140...79I
ADC_Keywords: Stars, variable ; Radial velocities
Keywords: stars: Cepheids - stars: fundamental parameters -
techniques: radial velocities
Abstract:
We present radial velocity data for 22 galactic Cepheid stars obtained
with Coravel spectrometer. Continuous observation over several years
has enabled us to obtain 852 individual velocities covering all the
phases of the pulsation. The mean number of measurements per star is
39, ranging from 20 to 113. For each star radial velocity versus phase
diagrams have been fitted by analytical relation, and the stellar
radius variation has been derived by integration of this relation over
the whole period. Using recent ubv photometry of the literature and
velocity curves, we have calculated the radii of the stars using a
method based on the Baade-Wesselink concept. For these 22 Cepheids we
give a linear logarithmic period-radius relation with a range of 2,4
to 45 days.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
object.dat 29 22 Sample of the Cepheids observed
table1.dat 63 850 Observed radial velocities, O-C and phases
table1.tex 188 586 LaTeX version of table1
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Byte-by-byte Description of file: object.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the Cepheid star
11- 20 F10.7 d Per [1.3/45.1] Period (1)
22- 29 F8.6 d e_Per ? Uncertainty in Per (1)
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Note (1): From Table 2 in the paper.
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 18 A8 "DD/MM/YY" Obs.date UT date of observation
20- 24 A5 "h:m" Obs.time UT time of observation
26- 36 F11.3 d HJD Heliocentric Julian date
38- 44 F7.3 km/s RV [-65/108] Observed radial velocity
46- 51 F6.2 km/s O-C [-11/36] Observed-calculated radial velocity
53- 58 F6.3 --- Phase [-1.72/2.231] Phase
60- 63 F4.2 km/s e_RV [0.11/1.86]? Standard error of RV
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Acknowledgements:
M. Imbert <maurice.imbert(at)observatoire.cnrs-mrs.fr>
(End) Patricia Bauer [CDS] 14-Sep-1999