Long Period Variables in NGC 5128: I. Catalogue

Abstract

The first variable star catalogue in a giant elliptical galaxy NGC 5128 (Centaurus A) is presented. Using multi-epoch observations with ISAAC at the VLT we have detected 1504 red variables in two halo fields covering 10.46 arcmin square. For the variables with at least 10 good measurements, periods and amplitudes were determined using Fourier analysis and non-linear sine-curve fitting algorithms. The final catalogue contains 1146 long period variables with well established light curve parameters. Periods, amplitudes, JsHKs photometry as well as individual Ks-band magnitudes are provided for all the variables. The distribution of amplitudes ranges from 0.3 to a few magnitudes in the Ks-band, with a median value around 0.7 mag. The amplitudes, mean magnitudes and periods indicate that the majority of variables belong to the class of long period variables with semiregular and Mira variables. Exhaustive simulations were performed in order to assess the completeness of our catalogue and the accuracy of the derived periods.

arXiv comment14 pages, 14 figures; Some figures are highly compressed. For a full resolution version see http://www.eso.org/~mrejkuba/cenA_LPVs_cat.ps This is a complete version of the article to appear in the electronic version of A&A. A&A accepted

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• Long Period Variables in NGC 5128: II. Near-IR properties
• Age Gradients Throughout the Galaxy with O-Miras
• Simulating the recent star formation history in the halo of NGC 5128
• Long-period variables in NGC147 and NGC185
• The outermost stellar halo of NGC 5128 (Centaurus A): Radial structure
• Pulsation properties of C stars in the Small Magellanic Cloud
• Ubiquitous Time Variability of Integrated Stellar Populations
• Ground-based variability surveys towards Centaurus A: worthwhile or not?