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J/ApJ/832/176        Classical Cepheids in MCs. I. LMC disk        (Inno+, 2016)

The panchromatic view of the Magellanic Clouds from classical Cepheids. I. Distance, reddening, and geometry of the Large Magellanic Cloud disk. Inno L., Bono G., Matsunaga N., Fiorentino G., Marconi M., Lemasle B., da Silva R., Soszynski I., Udalski A., Romaniello M., Rix H.-W. <Astrophys. J., 832, 176-176 (2016)> =2016ApJ...832..176I (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, VRI ; Photometry, infrared ; Reddening ; Stars, distances Keywords: Magellanic Clouds; stars: distances; stars: oscillations; stars: variables: Cepheids Abstract: We present a detailed investigation of the Large Magellanic Cloud (LMC) disk using classical Cepheids. Our analysis is based on optical (I, V; OGLE-IV), near-infrared (NIR: J, H, KS) and mid-infrared (MIR: w1; WISE) mean magnitudes. By adopting new templates to estimate the NIR mean magnitudes from single-epoch measurements, we build the currently most accurate, largest, and homogeneous multi-band data set of LMC Cepheids. We determine Cepheid individual distances using optical and NIR Period-Wesenheit relations (PWRs), to measure the geometry of the LMC disk and its viewing angles. Cepheid distances based on optical PWRs are precise at 3%, but accurate to 7%, while the ones based on NIR PWRs are more accurate (to 3%), but less precise (2%-15%), given the higher photometric error on the observed magnitudes. We found an inclination of i=25.05±0.02(stat.)±0.55(syst.)°, and a position angle of the lines of nodes P.A.=150.76±0.02(stat.)±0.07(syst.)°. These values agree well with estimates based either on young (Red Supergiants) or on intermediate-age (Asymptotic Giant Branch, Red Clump) stellar tracers, but they significantly differ from evaluations based on old (RR Lyrae) stellar tracers. This indicates that young/intermediate and old stellar populations have different spatial distributions. Finally, by using the reddening-law fitting approach, we provide a reddening map of the LMC disk, which is 10 times more accurate and 2 times larger than similar maps in the literature. We also found an LMC true distance modulus of µ0,LMC=18.48±0.10(stat. and syst.)mag, in excellent agreement with the currently most accurate measurement. Description: We cross-matched the LMC Cepheid catalog from OGLE-IV (Soszynski+, 2015AcA....65..297S) with the ALLWISE-Mep catalog, in order to complement our data with MIR ([3.4]um) time-series data. See table 9 for subsamples references. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table9.dat 214 3920 Catalog of optical-NIR-MIR measurements for Large Magellanic Cloud (LMC) Cepheids
See also: I/221 : The Magellanic Catalogue of Stars - MACS (Tucholke+ 1996) II/328 : AllWISE Data Release (Cutri+ 2013) II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009) II/288 : IRSF Magellanic Clouds Point Source Catalog (Kato+ 2007) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) IV/33 : Master Catalogue towards the Magellanic Clouds (MC2) (Delmotte+ 2002) II/228 : DENIS Catalogue toward Magellanic Clouds (DCMC) (Cioni+ 2000) J/A+A/580/A18 : Carina Project VIII. α-element abund. (Fabrizio+, 2015) J/A+A/576/A30 : NIR light-curve templates for classical Cepheids (Inno+, 2015) 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/438/2440 : Fourier analysis of 13095 LMC RR Lyr stars (Deb+, 2014) J/A+A/550/A70 : Galactic & MC Cepheids distance (Groenewegen 2013) J/MNRAS/424/1807 : VISTA Magellanic Cloud Survey. V. Cepheids (Ripepi+, 2012) J/AcA/61/285 : VI light curves of Galactic Bulge Cepheids (Soszynski+, 2011) J/A+A/534/A95 : LMC Cepheids radial velocities (Storm+, 2011) J/AJ/142/61 : RGB stars in LMC outer disk (Carrera+, 2011) J/ApJ/743/76 : Spitzer photometry of LMC Cepheids (Scowcroft+, 2011) J/ApJ/715/277 : Insights into the Cepheid distance scale (Bono+, 2010) J/MNRAS/397/933 : LMC type II Cepheids JHKs magnitudes (Matsunaga+, 2009) J/ApJ/679/71 : Mid-IR period-luminosity relations (Freedman+, 2008) J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008) J/A+A/476/73 : Calibration of Cepheid Per/Lum relation (Fouque+, 2007) J/AJ/128/2239 : JHKs photometry of 92 LMC Cepheids (Persson+, 2004) J/A+A/411/361 : VI photometry of extra-galactic Cepheids (Kanbur+, 2003) J/ApJS/142/71 : BVRI observations of LMC Cepheids (Sebo+, 2002) J/AcA/51/317 : OGLE DIA. Catalog of LMC and SMC images (Zebrun+, 2001) J/AcA/50/307 : OGLE LMC BVI photometry (Udalski+, 2000) J/AcA/49/543 : OGLE LMC + SMC Cepheids VI photometry (Pietrzynski+, 1999) J/AcA/49/223 : BVI photometry of OGLE LMC Cepheids (Udalski+, 1999) Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 17 A17 --- ID Stellar identifier (1) 19- 20 A2 --- Mod Stellar mode ("FO"=first overtone: 1645 instances; "FU"=fundamental mode; 2275 instances) 22- 29 A8 --- Set Sub-sample Cepheid belongs to (2) 31- 40 E10.4 d Per [0.2/99.2] Period 42- 50 E9.3 mag Imag [0/99.9] Mean I band intensity transformed into mags (3) 52- 60 E9.3 mag Vmag [0/20.3] Mean V band intensity transformed into mags (3) 62- 71 E10.4 mag Jmag [0/104] Mean J band intensity transformed into mags 73- 79 E7.1 mag e_Jmag [0/10]? Error in Jmag 81- 90 E10.4 mag Hmag [9/102] Mean H band intensity transformed into mags 92- 98 E7.1 mag e_Hmag [0.006/10]? Error in Hmag 100-109 E10.4 mag Ksmag [0/101] Mean Ks band intensity transformed into mags 111-117 E7.1 mag e_Ksmag [0/10]? Error in Ksmag 119-131 E13.7 deg RAdeg Right Ascension in decimal degrees (J2000) 133-146 E14.7 deg DEdeg Declination in decimal degrees (J2000) 148-157 E10.4 mag w1mag [8.5/16.3]? Mean WISE W1 (3.35um) band intensity transformed into mags 159-165 E7.1 mag e_w1mag [0.003/0.3]? Error in w1mag 167 A1 --- f_w1mag Flag on w1mag (4) 169-171 I3 --- o_w1mag [3/211]? Number of epochs available in w1mag 173-181 E9.3 mag DM [17.3/19.1]? Distance modulus (5) 183-189 E7.1 mag e_DM [0.003/0.1]? Error in DM 191-198 E8.1 mag E(B-V) [-0.3/1.1]? The (B-V) color excess (5) 200-206 E7.1 mag e_E(B-V) [0.002/0.05]? Error in E(B-V) 208-214 E7.1 --- chi2 [0.1/4100]? The Χ2 of the reddening-law fit
Note (1): The Harvard Variable catalog ID for the first ten Cepheids, and the OGLE ID for all the others in the OGLE catalog. Note (2): As defined in Table 1. Sample as follows: 2MASS = Skrutskie+ 2006, VII/233 (1108 instances) CPAP = CPAPIER; Macri+, 2015, J/AJ/149/117; <[MNK2015] DDD.ddddd+DD.ddddd> in Simbad (116 instances) IRSF = IRSF/SIRIUS Survey; Kato+ 2007, II/288 (2353 instances) P04 = Persson+, 2004, J/AJ/128/2239 (66 instances) VMC = Vista Survey for the Magellanic Clouds; Cioni+ 2011A&A...527A.116C (11 instances) VMC/CPAP = (169 instances) VMC/IRSF = (97 instances) Note (3): Where 0.0 = not observed. Note (4): Flag as follows: Y = w1mag was obtained by performing the Fourier-fit. N = w1mag was obtained by adopting the error-weighted mean of the observed magnitudes. Note (5): Obtained by adopting the reddening-fit method.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Feb-2017
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