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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 (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:
FileName Lrecl Records Explanations
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
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.
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
Bytes Format Units Label Explanations
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
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 ------------------------------------------------------------------------------- Band F References ------------------------------------------------------------------------------- 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); Laney & Stobie (1992A&AS...93...93L); Barnes et al. (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)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 26-May-2017
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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