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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 369 Parameters of the Cepheids
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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- 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)
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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]
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Acknowledgements:
Peter Klagyivik, klagyi(at)konkoly.hu
(End) P. Klagyivik [Konkoly Obs., Budapest], P. Vannier [CDS] 25-Sep-2009