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 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:
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RA (ICRS) DE Designation(s)
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05 23 34.6 -69 45 22 Large Magellanic Cloud = NAME LMC
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File Summary:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): The uncertainties were calculated by propagating the errors in mean
magnitudes.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): Source as follows:
MP = Monson & Pierce (2011ApJS..193...12M 2011ApJS..193...12M);
BTG = Barnes et al. (1997PASP..109..645B 1997PASP..109..645B);
LS = Laney & Stobie (1992A&AS...93...93L 1992A&AS...93...93L);
W = Welch et al. (1984ApJS...54..547W 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).
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Byte-by-byte Description of file: table5.dat
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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 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
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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 2007AJ....133.1810B; Monson et al. 2012, J/ApJ/759/146; Riess et al.
2014ApJ...785..161R 2014ApJ...785..161R)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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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)
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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.
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History:
From electronic version of the journal
References:
Macri et al. Paper I. 2015AJ....149..117M 2015AJ....149..117M, Cat. J/AJ/149/117
Bhardwaj et al. Paper III. 2016MNRAS.457.1644B 2016MNRAS.457.1644B
Bhardwaj et al. Paper IV. 2017AJ....153..154B 2017AJ....153..154B, Cat. J/AJ/153/154
Yuan et al. Paper V. 2017AJ....154..149Y 2017AJ....154..149Y
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 22-Mar-2018