| Issue |
A&A
Volume 406, Number 1, July IV 2003
|
|
|---|---|---|
| Page(s) | 75 - 85 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20030683 | |
| Published online | 17 November 2003 | |
Long period variables in NGC 5128*,**
I. Catalogue
1
European Southern Observatory, Karl-Schwartzschild-Strasse 2, 85748 Garching, Germany e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
,This email address is being protected from spambots. You need JavaScript enabled to view it.
2
Department of Astronomy, P. Universidad Católica, Casilla 306, Santiago 22, Chile e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Corresponding author: M. Rejkuba, This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
5
March
2003
Accepted:
6
May
2003
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, 
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.
Key words: galaxies: elliptical and lenticular, cD / galaxies: stellar content / stars: variables: general / stars: AGB and post-AGB / galaxies: individual: NGC 5128
Based on observations collected at the European Southern Observatory, Paranal, Chile, within the Observing Programmes 63.N-0229, 65.N-0164, 67.B-0503, 68.B-0129 and 69.B-0292, and at La Silla Observatory, Chile, within the Observing Programme 64.N-0176(B).
Tables 3–8 and Figs. 7–14 together with the complete Sect. 6 are only available in electronic form at http://www.edpsciences.org
© ESO, 2003
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