J/MNRAS/447/3342 Galactic and LMC Cepheids Fourier parameters (Bhardwaj+, 2015)
On the variation of Fourier parameters for Galactic and LMC Cepheids at
optical, near-infrared and mid-infrared wavelengths.
Bhardwaj A., Kanbur S.M., Singh H.P., Macri L.M., Ngeow C.-C.
<Mon. Not. R. Astron. Soc., 447, 3342-3360 (2015)>
=2015MNRAS.447.3342B 2015MNRAS.447.3342B (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Magellanic Clouds ; Stars, variable ;
Photometry, UBVRI ; Photometry, infrared
Keywords: stars: variables: Cepheids - Magellanic Clouds
Abstract:
We present a light-curve analysis of fundamental-mode Galactic and
Large Magellanic Cloud (LMC) Cepheids based on the Fourier
decomposition technique. We have compiled light-curve data for
Galactic and LMC Cepheids in optical (VI), near-infrared (JHKs) and
mid-infrared (3.6 and 4.5µm) bands from the literature and
determined the variation of their Fourier parameters as a function of
period and wavelength. We observed a decrease in Fourier amplitude
parameters and an increase in Fourier phase parameters with increasing
wavelengths at a given period. We also found a decrease in the
skewness and acuteness parameters as a function of wavelength at a
fixed period. We applied a binning method to analyse the progression
of the mean Fourier parameters with period and wavelength. We found
that for periods longer than about 20d, the values of the Fourier
amplitude parameters increase sharply for shorter wavelengths as
compared to wavelengths longer than the J band. We observed the
variation of the Hertzsprung progression with wavelength. The central
period of the Hertzsprung progression was found to increase with
wavelength in the case of the Fourier amplitude parameters and
decrease with increasing wavelength in the case of phase parameters.
We also observed a small variation of the central period of the
progression between the Galaxy and LMC, presumably related to
metallicity effects. These results will provide useful constraints for
stellar pulsation codes that incorporate stellar atmosphere models to
produce Cepheid light curves in various bands.
Description:
We analyse the light curves of fundamental-mode Galactic and LMC
Cepheids in multiple bands using Fourier decomposition techniques.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2a.dat 166 447 *V band Fourier parameters, Galactic Cepheid
table2b.dat 166 351 *I band Fourier parameters, Galactic Cepheid
table2c.dat 166 186 *J band Fourier parameters, Galactic Cepheid
table2d.dat 166 186 *H band Fourier parameters, Galactic Cepheid
table2e.dat 166 186 *Ks band Fourier parameters, Galactic Cepheid
table2f.dat 166 37 *3.6um band Fourier parameters, Galactic Cepheid
table2g.dat 166 37 *4.5um band Fourier parameters, Galactic Cepheid
table3a.dat 166 1832 *V band Fourier parameters, LMC Cepheid
table3b.dat 166 1843 *I band Fourier parameters, LMC Cepheid
table3c.dat 166 473 *J band Fourier parameters, LMC Cepheid
table3d.dat 166 531 *H band Fourier parameters, LMC Cepheid
table3e.dat 166 487 *Ks band Fourier parameters, LMC Cepheid
table3f.dat 166 84 *3.6um band Fourier parameters, LMC Cepheid
table3g.dat 166 84 *4.5um band Fourier parameters, LMC Cepheid
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Note on table2*.dat: Fourier parameters obtained using a sine series Fourier
fit to the Galactic Cepheid light curves in multibands.
Note on table3*.dat: Fourier parameters obtained using a sine series Fourier
fit to the LMC Cepheid light curves in multibands.
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See also:
J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008)
J/AJ/128/2239 : JHKs photometry of 92 LMC Cepheids (Persson+, 2004)
J/ApJ/743/76 : Spitzer photometry of LMC Cepheids (Scowcroft+, 2011)
J/ApJ/759/146 : 37 Galactic Cepheids Spitzer/IRAC photometry (Monson+, 2012)
Byte-by-byte Description of file: table2?.dat table3?.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name (1)
11- 17 F7.5 [d] logP Period
26- 36 F11.3 d t0 Time of maximum light (JD)
38 I1 --- N Optimum order of fit
40- 47 F8.5 --- Sk Skewness parameter in band
49- 56 F8.5 --- Ac Acuteness parameter in band
58- 65 F8.5 --- A1 A1 Fourier parameter in band
68- 74 F7.5 --- phi1 phi1 Fourier parameter in band
77- 83 F7.5 --- R21 R21 Fourier parameter in Band
85- 92 F8.5 --- R31 R31 Fourier parameter in Band
95-101 F7.5 --- phi21 phi21 Fourier parameter in band
104-110 F7.5 --- phi31 phi31 Fourier parameter in Band
112-119 F8.5 --- e_A1 rms uncertainty on A1
121-128 F8.5 --- e_phi1 rms uncertainty on phi1
130-137 F8.5 --- e_R21 rms uncertainty on R21
139-147 F9.5 --- e_R31 rms uncertainty on R31
149-156 F8.5 --- e_phi21 rms uncertainty on phi21
158-166 F9.5 --- e_phi31 rms uncertainty on phi31
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Note (1): The Star ID's are from corresponding catalogues listed in Table 1
for each band.
Star ID's consisting of four numbers are based on the OGLE-III catalogue
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Band F References
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VI G Berdnikov (1995, ASP conf.Ser, 83, 249)
VI L Soszynski et al. (2008, J/AcA/58/163), OGLE LMC-CEP-NNNN;
Ulaczyk et al. (2013, Cat. J/AcA/63/159)
JHKs G Welch et al. (1984ApJS...54..547W 1984ApJS...54..547W);
Laney & Stobie (1992A&AS...93...93L 1992A&AS...93...93L);
Barnes et al. (1997PASP..109..645B 1997PASP..109..645B);
Monson & Pierce (2011, J/ApJS/193/12)
JHKs L Macri et al. (2014, preprint arXiv:1412:1511);
Persson et al. (2004, J/AJ/128/2239)
(U1 = Cl* NGC 7089 SAW V1, U11 = Cl* NGC 7089 SAW V11)
3.6um,4.5um G Monson et al. (2012, J/ApJ/759/146)
3.6um,4.5um L Scowcroft et al. (2011, J/ApJ/743/76)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-May-2017