Authors: V Ripepi M I Moretti G Clementini M Marconi M R Cioni J B Marquette P Tisserand
Publish Date: 2012/03/10
Volume: 341, Issue: 1, Pages: 51-56
Abstract
The Vista Magellanic Cloud VMC PI MR Cioni survey is collecting K S band time series photometry of the system formed by the two Magellanic Clouds MC and the “bridge” that connects them These data are used to build K S band light curves of the MC RR Lyrae stars and Classical Cepheids and determine absolute distances and the 3D geometry of the whole system using the Kband period luminosity PLK S the period–luminosity–color PLC and the Wesenhiet relations applicable to these types of variables As an example of the survey potential we present results from the VMC observations of two fields centered respectively on the South Ecliptic Pole and the 30 Doradus star forming region of the Large Magellanic Cloud The VMC K S band light curves of the RR Lyrae stars in these two regions have very good photometric quality with typical errors for the individual data points in the range of ∼002 to 005 mag The Cepheids have excellent light curves typical errors of ∼001 mag The average K S magnitudes derived for both types of variables were used to derive PLK S relations that are in general good agreement within the errors with the literature data and show a smaller scatter than previous studies
Keywords: