Long period variables in the giant elliptical galaxy NGC 5128: the Mira P-L relation at 4 Mpc

Details Long period variables in the giant elliptical galaxy NGC 5128: the Mira P-L relation at 4 Mpc Long period variables in the giant elliptical galaxy NGC 5128: the Mira P-L relation at 4 Mpc

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003msngr.112...43r&link_type=abstract

The Messenger (ISSN 0722-6691), No. 112, p. 43 - 46 (June 2003)

Astronomy and Astrophysics

Astrophysics

1

Elliptical Galaxies, Long-Period Variables

Scientific paper

ISAAC multi-epoch K-band photometry of two fields in the halo of NGC 5128 was used to detect variable stars. We derived periods for most of these variables via Fourier analysis of the K-band light curves and sine-wave fitting. Their magnitudes indicate that they are in the AGB phase and their periods and amplitudes are consistent with being LPVs. The long-period (400≥P≥100 d) large-amplitude (0.5<ΔK<1.5 mag) Mira variables were used to determine the distance of NGC 5128 from a P-L relation. Adopting a LMC distance modulus of 18.50, we derive the distance modulus of 28.1±0.3, corresponding to D = 4.2±0.6 Mpc. In closing, we would like to note that such programs that require numerous (>10) and relatively short (~1.5 h per Field) observations benefit greatly from the availability of service mode observations. All the images were taken in excellent seeing conditions, ranging from 0'.35-0'.65, enabling us to detect variable stars in a giant elliptical galaxy for the first time and construct the first Mira period-luminosity diagram outside the Local Group. The catalogue with light curve parameters and near-IR photometry of all the variable stars is available through Astronomy & Astrophysics (Rejkuba et al. 2003).

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