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J/A+A/504/959       Amplitudes of single-mode Cepheids      (Klagyivik+, 2009)

Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids and interrelation of amplitudes. Klagyivik P., Szabados L. <Astron. Astrophys. 504, 959 (2009)> =2009A&A...504..959K
ADC_Keywords: Stars, variable ; Photometry, UBVRI ; Photometry, Cousins Keywords: Cepheids - stars: fundamental parameters - astronomical data bases:miscellaneous Abstract: The dependence of amplitude on the pulsation period differs from other Cepheid-related relationships. We attempt to revise the period-amplitude (P-A) relationship of Galactic Cepheids based on multi-colour photometric and radial velocity data. Reliable P-A graphs for Galactic Cepheids constructed for the U, B, V, Rc, and Ic photometric bands and pulsational radial velocity variations facilitate investigations of previously poorly studied interrelations between observable amplitudes. The effects of both binarity and metallicity on the observed amplitude, and the dichotomy between short- and long-period Cepheids can both be studied. A homogeneous data set was created that contains basic physical and phenomenological properties of 369 Galactic Cepheids. Pulsation periods were revised and amplitudes were determined by the Fourier method. P-A graphs were constructed and an upper envelope to the data points was determined in each graph. Correlations between various amplitudes and amplitude-related parameters were searched for, using Cepheids without known companions. Description: Photometric and radial velocity amplitudes and amplitude related parameters of Galactic single mode classical Cepheids are given complemented with indication of spectroscopic [Fe/H] value, binarity and the pulsation mode. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 110 369 Parameters of the Cepheids
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Name of the Cepheid 11- 16 F6.2 deg GLON Galactic longitude 18- 23 F6.2 deg GLAT Galactic latitude 25- 30 F6.3 d Period Pulsation period 32- 36 F5.2 mag <Vmag> Mean apparent V magnitude 38- 42 F5.3 mag AU ? Peak-to-peak amplitude in U band 44- 48 F5.3 mag AB ? Peak-to-peak amplitude in B band 50- 54 F5.3 mag AV ? Peak-to-peak amplitude in V band 56- 60 F5.3 mag AR ? Peak-to-peak amplitude in Rc band 62- 66 F5.3 mag AI ? Peak-to-peak amplitude in Ic Band 68- 71 F4.1 km/s ARV ? Peak-to-peak amplitude of the radial velocity variations (1) 73- 76 F4.1 km/s/mag q ? Amplitude ratio (ARV/AB) 78- 82 F5.3 um.mag m ? m parameter (2) 84- 88 F5.3 --- e_m ? Error of m parameter 90- 94 F5.3 --- k ? k parameter (3) 96-100 F5.3 --- e_k ? Error of k parameter 102-106 F5.2 [Sun] [Fe/H] ? Metallicity 108 I1 --- bin [0/1] Binarity index: 0 = no known companion, 1 = known binary or >1 known companions 110 I1 --- mod [0/1]? Pulsation mode (0 = fundamental, 1 = 1st overtone)
Note (1): corrected for the effect of orbital motion in the case of known spectroscopic binaries Note (2): Characteristic of the wavelength dependence of the photometric UBVR amplitude: A(λ) = m (1/λ) + const. [m=(0.282±0.027)logP+0.440±0.027, λ in µm] Note (3): Characteristic of the wavelength dependence of the photometric UBVRI amplitude: A(λ) = mk (1/λ)k + const. [k=(1.650±0.173)xlogP+0.606±0.172, λ in µm]
Acknowledgements: Peter Klagyivik, klagyi(at)
(End) P. Klagyivik [Konkoly Obs., Budapest], P. Vannier [CDS] 25-Sep-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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