J/MNRAS/511/2125 Period changes of 148 Galactic Cepheids (Csornyei+, 2022)
Study of changes in the pulsation period of 148 Galactic Cepheid variables.
Csornyei G., Szabados L., Molnar L., Cseh B., Egei N., Kalup Cs.,
Kecskemethy V., Konyves-Toth R., Sarneczky K., Szakats R.
<Mon. Not. R. Astron. Soc. 511, 2125-2146 (2022)>
=2022MNRAS.511.2125C 2022MNRAS.511.2125C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, bright ; Stars, nearby ; Photometry ;
Optical
Keywords: binaries: general - stars: evolution - stars: oscillations -
stars: variables: Cepheids
Abstract:
Investigating period changes of classical Cepheids through the
framework of O-C diagrams provides a unique insight to the evolution
and nature of these variable stars. In this catalogue, we present the
O-C diagrams and period change rates derived for 148 Galactic
Classical Cepheids variables, along with the exact period values of
these stars for a given date as determined by the O-C diagrams. The
catalogue also contains photometric data adopted from Gaia EDR3 and
the David Dunlap Observatory Cepheid Database, which were used for the
study, and the results obtained from the statistical modelling of the
individual O-C diagrams. We find that a significant fraction of the
Cepheids show period fluctuations, which appear on the O-C diagrams as
quasi-periodic waves, which could be modelled and described through
the statistical framework. For completeness, we also included all
photometric data collected from various previous publications and
survey that were used for the research.
Description:
The O-C diagrams presented in this catalogue were calculated and
analysed using the standard procedures described in Sterken
(2005ASPC..335....3S 2005ASPC..335....3S). To measure the significance and amplitude of
the fluctuations, we fitted and compared different complexity models
on the O-C diagram using F-test. The code used for this study can be
found at https://github.com/Csogeza/O-C_extract. All the data used for
this study are openly available, however for reproducibility and
accessibility we include these along the catalogue.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 117 141 Main summary file of obtained period change rates,
exact period values and photometric properties
table2.dat 40 141 Results of the F-tests conducted on the O-C diagram
with different models, fluctuation amplitudes
table3.dat 28 231 Photometry obtained at Piszkestet Observatory
(for 14 stars)
table4.dat 72 13792 Table of obtained O-C diagrams (for 148 stars)
table5.dat 60 1267855 Photometric time series used for this study
(for 147 stars)
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration 2020)
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 GCVS name of Cepheid
11- 20 F10.7 d P(O-C) Period assumed for O-C diagram
22- 34 F13.4 --- EpP(O-C) Reference epoch for O-C diagram
36- 47 F12.9 d P1 Period determined for JD2459591.5
49- 60 F12.9 0.01d/yr dP/dt Period change rate
62- 72 F11.9 0.01d/yr e_dP/dt Period change rate error
74- 79 F6.3 mag Gmag Gaia EDR3 G magnitude
81- 85 F5.3 mag BP-RP Gaia EDR3 BP-RP colour
87- 91 F5.3 mag E(B-V) Assumed reddening
93- 97 F5.3 mag e_E(B-V) Reddening error
99-104 F6.3 [-] log10(Eps) ? Eddington-Plakidis period fluctuation
parameter
106-110 F5.3 mas Plx Gaia EDR3 parallax
112-117 F6.4 mas e_Plx Gaia EDR3 parallax error
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name GCVS name of Cepheid
11- 18 F8.2 --- F-lp F-statistic of first model pair (1)
20- 26 F7.2 --- F-lw F-statistic of second model pair (2)
28- 33 F6.2 --- F-pw F-statistic of third model pair (3)
35- 40 F6.3 d Ampl ? O-C amplitude of found fluctuation
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Note (1): F-statistic value obtained for the comparison of a linear and a
parabolic model for the O-C diagram fitting
Note (2): F-statistic value obtained for the comparison of a linear and a
parabolic+sinusoidal wave model for the O-C diagram fitting, where the
parabolic function and the modulation are optimized simultaneously
Note (3): F-statistic value obtained for the comparison of a parabolic and a
parabolic+sinusoidal wave model for the O-C diagram fitting, where the
parabolic function and the modulation are optimized simultaneously
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name GCVS name of Cepheid
10- 20 F11.3 d JD Julian date of observation
22- 28 F7.4 mag Vmag Bessel V magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name GCVS name of Cepheid
11- 22 F12.4 d HJD Heliocentric Julian date
24- 29 I6 --- Epoch Epoch of O-C point (1)
31- 38 F8.4 d O-C O-C value at epoch
40- 46 F7.4 d e_O-C O-C error
48- 72 A25 --- Source Source of photometry
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Note (1): As obtained assuming the Period and Reference Epochs listed
in table1.dat.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name GCVS name of Cepheid
11- 24 F14.6 d HJD Heliocentric Julian date
26- 39 F14.10 mag Vmag V-band magnitude (1)
41- 60 A20 --- Source Source of photometry
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Note (1): or differential or instrumetal magnitude.
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Acknowledgements:
Geza Csornyei, csornyei.geza(at)csfk.org
(End) Patricia Vannier [CDS] 24-Jan-2022