Issue |
A&A
Volume 430, Number 2, February I 2005
|
|
---|---|---|
Page(s) | 603 - 628 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20041659 | |
Published online | 20 January 2005 |
Variable stars in the bar of the Large Magellanic Cloud: The photometric catalogue *,**,***
1
INAF - Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy e-mail: [gisella.clementini;marcella.maio;angela.bragaglia;eugenio.carretta; paolo.montegriffo]@bo.astro.it
2
INAF - Centro Galileo Galilei & Telescopio Nazionale Galileo, PO Box 565, 38700 S.Cruz de La Palma, Spain e-mail: difabrizio@tng.iac.es
3
INAF - Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy e-mail: gratton@pd.astro.it
4
Pontificia Universidad Católica de Chile, Departado de Astronomía y Astrofísica, Av. Vicuna Mackenna 4860, 782-0436, Macul, Santiago, Chile e-mail: mzoccali@astro.puc.cl
5
Princeton University Observatory, Peyton Hall, Princeton NJ 08544, USA
Received:
14
July
2004
Accepted:
27
September
2004
The catalogue of the Johnson-Cousins and I light curves
obtained for 162
variable stars (135 RR Lyrae, 4 candidate Anomalous Cepheids, 11 Classical Cepheids,
11 eclipsing binaries and 1 δ
Scuti star) in two areas close to the bar of the Large Magellanic Cloud is
presented along with coordinates, finding charts, periods, epochs,
amplitudes, and mean
quantities
(intensity- and magnitude-averaged luminosities) of the variables with full
coverage of the
light variations.
A star by star comparison is made with MACHO and OGLE II photometries based
on both
variable and constant stars in common, and the
transformation relationships to our photometry are provided.
The pulsation properties of the RR Lyrae stars in the sample are discussed in
detail.
Parameters of the Fourier decomposition of the light curves are derived
for the fundamental
mode RR Lyrae stars with complete and regular curves (29 stars).
They are
used to estimate metallicities, absolute magnitudes,
intrinsic
colours, and temperatures of the variable stars, according
to Jurcsik & Kovács ([CITE], A&A, 312, 111), and Kovács & Walker ([CITE], A&A, 371, 579) method. Quantities derived
from the Fourier parameters are compared with
the corresponding observed quantities. In particular,
the “photometric” metallicities are compared with the spectroscopic
metal abundances derived by Gratton et al. ([CITE], A&A, 421, 937) from low
resolution spectra obtained with FORS at the Very Large Telescope.
Key words: stars: fundamental parameters / stars: variables: general / stars: variables: RR Lyrae / galaxies: individual: LMC / techniques: photometric
© ESO, 2005
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