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J/AJ/151/88  LMC NIR Synoptic Survey. II. Wesenheit relations  (Bhardwaj+, 2016)

Large Magellanic Cloud near-infrared Synoptic Survey. II. The Wesenheit relations and their application to the distance scale. Bhardwaj A., Kanbur S.M., Macri L.M., Singh H.P., Ngeow C.-C., Wagner-Kaiser R., Sarajedini A. <Astron. J., 151, 88 (2016)> =2016AJ....151...88B (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Milky Way ; Surveys ; Stars, variable ; Photometry, VRI ; Photometry, infrared ; Stars, distances Keywords: Local Group - Magellanic Clouds - stars: variables: Cepheids Abstract: We present new near-infrared (NIR) Cepheid period-Wesenheit (P-W) relations in the LMC using time-series observations from the Large Magellanic Cloud NIR Synoptic Survey. We also derive optical+NIR P-W relations using V and I magnitudes from the Optical Gravitational Lensing Experiment. We employ our new JHKs data to determine an independent distance to the LMC of µLMC=18.47±0.07 (statistical) mag, using an absolute calibration of the Galactic relations based on several distance determination methods and accounting for the intrinsic scatter of each technique. We also derive new NIR period-luminosity and Wesenheit relations for Cepheids in M31 using observations from the Panchromatic Hubble Andromeda Treasury survey. We use the absolute calibrations of the Galactic and LMC WJ,H relations to determine the distance modulus of M31, µM31=24.46±0.20 mag. We apply a simultaneous fit to Cepheids in several Local Group galaxies covering a range of metallicities (7.7<12+log[O/H]<8.6 dex) to determine a global slope of -3.244±0.016 mag/dex for the WJ,H relation and obtain robust distance estimates. Our distances are in good agreement with recent TRGB based distance estimates and we do not find any evidence for a metallicity dependence in the NIR P-W relations. Description: We make use of NIR mean magnitudes for 775 fundamental-mode and 474 first-overtone Cepheids in the LMC from Macri et al. 2015, J/AJ/149/117 (Paper I). These magnitudes are based on observations from a synoptic survey (average of 16 epochs) of the central region of the LMC using the CPAPIR camera at the Cerro Tololo Interamerican Observatory 1.5-m telescope between 2006 and 2007. Most of these Cepheid variables were previously studied in the optical V and I bands by the third phase of the Optical Gravitational Lensing Experiment (OGLE-III) survey (Soszynski et al. 2008, J/AcA/58/163; Ulaczyk et al. 2013, J/AcA/63/159). The V and I band mean magnitudes are also compiled in Paper I. The calibration into the 2MASS photometric system, extinction corrections, and the adopted reddening law are discussed in detail in Paper I. Objects: --------------------------------------------------------------- RA (ICRS) DE Designation(s) --------------------------------------------------------------- 05 23 34.6 -69 45 22 Large Magellanic Cloud = NAME LMC --------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 167 1264 Wesenheit magnitudes for Cepheids in the LMC table4.dat 62 113 Fourier-fitted mean magnitudes table5.dat 64 116 Galactic Cepheid Distance Moduli table6.dat 97 103 Calibrated Magnitudes for Fundamental-Mode Galactic Cepheids
See also: J/AcA/49/223 : BVI photometry of OGLE LMC Cepheids (Udalski+, 1999) J/ApJS/142/71 : BVRI observations of LMC Cepheids (Sebo+, 2002) J/A+A/404/423 : BVI photometry of Galactic Cepheids (Tammann+, 2003) J/AJ/128/2239 : JHKs photometry of 92 LMC Cepheids (Persson+, 2004) J/A+A/476/73 : Calibration of Cepheid Period/Luminosity relation (Fouque+, 2007) J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008) J/AcA/58/313 : LMC Cepheids in OGLE and MACHO data (Poleski+, 2008) J/ApJ/679/71 : Mid-IR period-luminosity relations (Freedman+, 2008) J/MNRAS/397/933 : LMC type II Cepheids JHKs magnitudes (Matsunaga+, 2009) J/A+A/534/A95 : LMC Cepheids radial velocities (Storm+, 2011) J/ApJ/747/50 : Distance to Cepheids using the Wesenheit function (Ngeow, 2012) J/ApJ/759/146 : Spitzer/IRAC photometry for 37 Galactic Cepheids (Monson+, 2012) J/MNRAS/424/1807 : VISTA Magellanic Cloud Survey. V. Cepheids (Ripepi+, 2012) J/A+A/550/A70 : Galactic and Magellanic Cloud Cepheids distance (Groenewegen, 2013) J/AcA/63/159 : LMC OGLE-III Shallow Survey variable stars (Ulaczyk+, 2013) J/PAZh/39/942 : Galactic classical Cepheids properties (Marsakov+, 2013) J/AJ/149/117 : LMC infrared survey. I. Photometry of Cepheids (Macri+, 2015) J/MNRAS/446/3034 : LMC Type II Cepheids J and Ks light curves (Ripepi+, 2015) J/MNRAS/447/3342 : Galactic and LMC Cepheids Fourier parameters (Bhardwaj+, 2015) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- ID Star ID 10- 11 A2 --- Type Type, Fundamental (FU) or First Overtone (FO) 13- 18 F6.3 [d] logP [-0.141/1.997] Log of the Period 20- 25 F6.3 mag WJHmag [8.908/15.478] Wesenheit WJ,H index (WJ,H=H-1.63(J-H)) 27- 32 F6.3 mag WJKsmag [9.065/15.598] Wesenheit WJ,Ks index (WJ,Ks=KS-0.69(J-KS)) 34- 39 F6.3 mag WHKsmag [9.181/15.866] Wesenheit WH,Ks index (WH,Ks=KS-1.92(H-KS)) 41- 47 F7.3 mag WVJmag [-21.718/15.999]? Wesenheit WV,J index (WV,J=J-0.41(V-J)) 49- 54 F6.3 mag WVHmag [-5.388/16.075]? Wesenheit WV,H index (WV,H=H-0.22(V-H)) 56- 61 F6.3 mag WVKsmag [1.990/15.736] Wesenheit WV,Ks index (WV,Ks=KS-0.13(V-KS)) 63- 69 F7.3 mag WIJmag [-65.743/16.048]? Wesenheit WI,J index (WI,J=J-0.92(I-J)) 71- 77 F7.3 mag WIHmag [-23.044/15.671]? Wesenheit WI,H index (WI,H=H-0.42(I-H)) 79- 84 F6.3 mag WIKsmag [-7.551/15.720]? Wesenheit WI,Ks index (WI,Ks=KS-0.24(I-KS)) 86- 92 F7.3 mag WHVImag [-20.931/15.785]? Wesenheit WHV,I index (WHV,I=H-0.41(V-I)) 94-100 F7.3 mag e_WJHmag [0.039/127.098] Uncertainty in WJHmag (1) 102-108 F7.3 mag e_WJKsmag [0.016/224.996] Uncertainty in WJKsmag (1) 110-116 F7.3 mag e_WHKsmag [0.047/408.082] Uncertainty in WHKsmag (1) 118-123 F6.3 mag e_WVJmag [0.023/54.039]? Uncertainty in WVJmag (1) 125-130 F6.3 mag e_WVHmag [0.015/51.243]? Uncertainty in WVHmag (1) 132-138 F7.3 mag e_WVKsmag [0.012/184.540]Uncertainty in WVKsmag (1) 140-145 F6.3 mag e_WIJmag [0.048/67.941]? Uncertainty in WIJmag (1) 147-152 F6.3 mag e_WIHmag [0.026/55.316]? Uncertainty in WIHmag (1) 154-160 F7.3 mag e_WIKsmag [0.016/188.197]? Uncertainty in WIKsmag (1) 162-167 F6.3 mag e_WHVImag [0.032/51.000]? Uncertainty in WHVImag (1)
Note (1): The uncertainties were calculated by propagating the errors in mean magnitudes.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Star ID 11- 13 A3 --- Source Source of Light Curve (1) 15- 20 F6.3 d Per [1.949/68.464] Period 22- 26 F5.3 mag Jmag [1.773/8.843] Fourier-fitted mean J magnitude, 2MASS 28- 32 F5.3 mag Hmag [1.217/8.235] Fourier-fitted mean H magnitude, 2MASS 34- 38 F5.3 mag Ksmag [1.098/8.021] Fourier-fitted mean KS magnitude, 2MASS 40- 44 F5.3 mag e_Jmag [0.022/0.049] Uncertainty in Jmag (2) 46- 50 F5.3 mag e_Hmag [0.021/0.037] Uncertainty in Hmag (2) 52- 56 F5.3 mag e_Ksmag [0.022/0.068] Uncertainty in Ksmag (2) 58- 62 F5.3 mag E(B-V) [0.039/1.236] Adopted E(B-V) colour excess (3)
Note (1): Source as follows: MP = Monson & Pierce (2011ApJS..193...12M); BTG = Barnes et al. (1997PASP..109..645B); LS = Laney & Stobie (1992A&AS...93...93L); W = Welch et al. (1984ApJS...54..547W). Note (2): The error estimate includes the uncertainties from the Fourier fit and the photometry. Note (3): The color excess E(B-V) values are taken from Tammann et al. (2003, J/A+A/404/423).
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Star ID 11- 15 F5.2 mag IRSB ?=99.99 [6.68/13.41] Infrared Surface Brightness distance modulus (1) 17- 20 F4.2 mag e_IRSB ?=9.99 [0.02/9.03] Uncertainty in IRSB 22- 26 F5.2 mag MS ?=99.99 [6.76/12.74] Main-Sequence fitting distance modulus (Turner 2010Ap&SS.326..219T) 28- 31 F4.2 mag e_MS ?=9.99 [0.04/0.31] Uncertainty in MS 33- 37 F5.2 mag BW ?=99.99 [6.99/13.62] Baade-Wesselink distance modulus (Groenewegen 2013, J/A+A/550/A70) 39- 42 F4.2 mag e_BW ?=9.99 [0.02/9.56] Uncertainty in BW 44- 48 F5.2 mag Plx ?=99.99 [7.19/11.84] HST Parallax distance modulus (2) 50- 53 F4.2 mag e_Plx ?=9.99 [0.09/0.30] Uncertainty in Plx 55- 59 F5.2 mag WM [7.03/13.62] Weighted Mean distance modulus 61- 64 F4.2 mag e_WM [0.09/0.63] Uncertainty in WM
Note (1): Infrared Surface Brightness (IRSB) method (Fouque et al. 2007, J/A+A/476/73; Storm et al. 2011, J/A+A/534/A95). Note (2): Hubble Space Telescope parallaxes (HST-π) (Benedict et al. 2007AJ....133.1810B; Monson et al. 2012, J/ApJ/759/146; Riess et al. 2014ApJ...785..161R)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Star ID 11- 15 F5.3 [d] logP [0.432/1.835] Log of the Period 17- 22 F6.3 mag JMag [-8.082/-3.654] Absolute J magnitude, 2MASS 24- 29 F6.3 mag HMag [-8.422/-3.919] Absolute H magnitude, 2MASS 31- 36 F6.3 mag KMag [-8.543/-3.927] Absolute K magnitude, 2MASS 38- 42 F5.3 mag e_JMag [0.091/0.630] Uncertainty in JMag (1) 44- 48 F5.3 mag e_HMag [0.091/0.630] Uncertainty in HMag (1) 50- 54 F5.3 mag e_KMag [0.091/0.630] Uncertainty in KMag (1) 56 A1 --- F1 [YN] Flag if Cepheid is used in final period-luminosity (P-L) fit (Y=Yes, N=No) 58- 63 F6.3 mag WJHmag [-8.975/-4.350] Wesenheit WJ,H index (WJ,H=H-1.63(J-H)) 65- 70 F6.3 mag WJKmag [-8.861/-4.116] Wesenheit WJ,K index 72- 77 F6.3 mag WHKmag [-8.776/-3.943] Wesenheit WH,K index 79- 83 F5.3 mag e_WJHmag [0.096/0.631] Uncertainty in WJHmag (1) 85- 89 F5.3 mag e_WJKmag [0.092/0.630] Uncertainty in WJKmag (1) 91- 95 F5.3 mag e_WHKmag [0.097/0.631] Uncertainty in WHKmag (1) 97 A1 --- F2 [YN] Flag if Cepheid is used in final period-Wesenheit (P-W) fit (Y=Yes, N=No)
Note (1): The uncertainties in absolute magnitudes include the errors in mean magnitudes and distance moduli from Table 4 and 5, errors from transformations to 2MASS system and reddening corrections. These errors are propagated to estimate uncertainty for Wesenheit magnitudes.
History: From electronic version of the journal References: Macri et al. Paper I. 2015AJ....149..117M, Cat. J/AJ/149/117 Bhardwaj et al. Paper III. 2016MNRAS.457.1644B Bhardwaj et al. Paper IV. 2017AJ....153..154B Yuan et al. Paper V. 2017AJ....154..149Y
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 22-Mar-2018
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