J/MNRAS/504/1 VMC RR Lyrae in LMC (Cusano+, 2021)
The VMC Survey. XLII. Near-infrared period-luminosity relations for RR Lyrae
stars and the structure of the Large Magellanic Cloud.
Cusano F., Moretti M.I., Clementini G., Ripepi V., Marconi M.,
Cioni M.-R.L., Rubele S., Garofalo A., De Grijs R., Groenewegen M.A.T.,
Oliveira J.M., Subramanian S., Sun N.-C., Van Loon J.T.
<Mon. Not. R. Astron. Soc., 504, 1-15 (2021)>
=2021MNRAS.504....1C 2021MNRAS.504....1C (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, infrared
Keywords: stars: variables: RR Lyrae - galaxies: distances and redshifts -
Magellanic Clouds
Abstract:
We present results from an analysis of ∼29000 RR Lyrae stars
located in the Large Magellanic Cloud (LMC). For these objects,
near-infrared time-series photometry from the VISTA survey of the
Magellanic Clouds system (VMC) and optical data from the Optical
Gravitational Lensing Experiment (OGLE) IV survey and the Gaia Data
Release 2 catalogue of confirmed RR Lyrae stars were exploited. Using
VMC and OGLE IV magnitudes we derived period-luminosity (PL),
period-luminosity-metallicity (PLZ), period-Wesenheit (PW), and
period-Wesenheit-metallicity (PWZ) relations in all available bands.
More that 7000 RR Lyrae were discarded from the analysis because they
appear to be overluminous with respect to the PL relations. The
PLKs_ relation was used to derive individual distance to ∼22000
RR Lyrae stars, and study the three-dimensional structure of the LMC.
The distribution of the LMC RR Lyrae stars is ellipsoidal with the
three axis S1=6.5kpc, S2=4.6kpc, and S3=3.7kpc,
inclination i=22±4° relative to the plane of the sky and
position angle of the line of nodes θ=167±7°
(measured from north to east). The north-eastern part of the ellipsoid
is closer to us and no particular associated substructures are
detected and neither any metallicity gradient.
Description:
We have obtained new NIR (Ks-, J-, and Y-band) and optical (I band)
PL, PW, PLZ, and PWZ relations from a sample of RRLs in the LMC using
the VMC, OGLE IV, and Gaia data sets.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 151 22088 List of LMC RRLs analysed in the paper
table2.dat 40 599935 Y, J, and Ks time-series photometry for the
RRLs analysed in this paper
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/351 : VISTA Magellanic Survey (VMC) catalog (Cioni+, 2011)
J/AcA/66/131 : VI light curves of SMC and LMC RR Lyrae (Soszynski+, 2016)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- ID OGLE IV ID or Gaia DR2 ID (1)
15- 26 I12 --- VMC VMC ID
30- 40 F11.8 deg RAdeg Right ascension (J2000)
44- 55 F12.8 deg DEdeg Declination (J2000)
59- 60 A2 --- Pmod Pulsation mode
68- 77 F10.8 d Per Period
81- 90 E10.1 d T0 Epoch of maximum light (2)
93- 97 F5.2 [-] [Fe/H] ?=99 Metallicity
100-104 F5.2 mag AK ?=99 Absorption in the Ks band
108-109 I2 --- N(Ks) Number of epochs in the Ks band
117-118 I2 --- N(Y) Number of epochs in the Y band
123-124 I2 --- N(J) Number of epochs in the J band
129-133 F5.2 mag <Ksmag> Average VMC magnitudes Ks band
139-143 F5.2 mag <Ymag> Average VMC magnitudes Y band
147-151 F5.2 mag <Jmag> Average VMC magnitudes J band
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Note (1): five digit number -OGLE-LMC-RRLYR-) or Gaia DR2 ID (>5 digit number).
Note (2): -2456000 for OGLE sources, -2455197.5 for Gaia DR2 sources.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 I12 --- VMC VMC ID
14 A1 --- Band [KJY] Band
16- 27 F12.6 d HJD Heliocentric Julian date (HJD-2400000)
30- 34 F5.2 mag mag Magnitude in Band
36- 40 F5.2 mag e_mag rms uncertainty on mag
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Acknowledgements:
Felice Cusano, felice.cusano(at)inaf.it
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(End) Patricia Vannier [CDS] 09-Jan-2024