The VMC survey. XXVI. Structure of the Small Magellanic Cloud from RR Lyrae stars. (2018)
Keywords :
surveys - stars variables: RR Lyrae - Magellanic Clouds - galaxies: structure
Abstract:We present results from the analysis of 2997 fundamental mode RR Lyrae variables located in the Small Magellanic Cloud (SMC). For these objects, near-infrared time series photometry from the VISTA survey of the Magellanic Clouds system (VMC) and visual light curves from the OGLE IV (Optical Gravitational Lensing Experiment IV) survey are available. In this study, the multi-epoch Ks-band VMC photometry was used for the first time to derive intensity-averaged magnitudes of the SMC RR Lyrae stars. We determined individual distances to the RR Lyrae stars from the near-infrared period-absolute magnitude-metallicity (PM_Ks_Z) relation, which has some advantages in comparison with the visual absolute magnitude-metallicity (M_V_-[Fe/H]) relation,
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VMC (Cioni et al., 2011A&A...527A.116C, Cat. II/351) is an ongoing
imaging survey of the MS in the Y, J, Ks passbands, centred at
{lambda}=1.02, 1.25 and 2.15um, respectively. It started in 2009 and
observations of the MS were 89 per cent complete as of 2017
September, while the observations of the SMC were 100 per cent
complete. The survey covers the LMC area (~105deg^2^) with 68 tiles,
the SMC (~42deg^2^) with 27 tiles, the MB area (~21deg^2^) with 13
tiles and part of the Stream (~3deg^2^) with two tiles. The VMC
Ks-band observations are taken over 13 separate epochs: 11 times with
an exposure time of 750s (deep epochs) and twice with an exposure
time of 375s (shallow epochs). Additional epochs may be obtained if
observations have to be repeated because the requested sky conditions
are not met.
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- J/A+A/531/A157 : LMC planetary nebulae (VMC Survey II) (Miszalski+, 2011)
- J/MNRAS/424/1807 : VISTA Magellanic Cloud Survey. V. Cepheids (Ripepi+, 2012)
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- J/A+A/554/A33 : VMC Survey. VII. 30 Doradus reddening map (Tatton+, 2013)
- J/MNRAS/437/2307 : VMC survey. VIII. LMC anomalous Cepheid (Ripepi+, 2014)
- J/MNRAS/437/2702 : VMC survey. X. MC Cepheids, RR Lyr & binaries
- J/MNRAS/446/3034 : VMC survey. XIII. LMC Type II Cepheids (Ripepi+, 2015)
- J/MNRAS/449/639 : VMC survey. XIV. SFR in SMC (Rubele+, 2015)
- J/MNRAS/454/839 : VMC survey. XVI. LMC clusters (Piatti+, 2015)
- J/ApJS/224/21 : VMC survey. XIX. Classical Cepheids in SMC (Ripepi+, 2016)
- J/MNRAS/459/1687 : VMC survey. XX. SMC new Cepheids light curves
- J/ApJ/849/149 : VMC survey, XXVII. Young stellar structures in LMC
- J/ApJ/858/31 : VMC survey. XXIX. Star formation in SMC (Sun+, 2018)
- J/A+A/636/A48 : VMC Survey. XXXVII. MC AGB stars (Groenewegen+, 2020)
- J/AcA/66/131 : VI light curves of SMC and LMC RR Lyrae (Soszynski+, 2016)
