VISTA variability survey of Local Group Galaxies
PI:
Martin Groenewegen
Scientific Aim:
The primary aim of this survey is to observe 4 Local Group Galaxies
(Fornax, NGC 6822, IC 1613 and WLM) 50 times over a 3 year period down
to point-source magnitudes of about K= 18.8 and Z= 21.5
(15sigma, Vega system) in a single observation. This will enable
the detection of all cepheids and AGB Mira variables in those galaxies
(and RR Lyrae in Fornax). In addition, the brightest variable
main-sequence stars and eclipsing binaries will be detected. This
survey will provide a unique database of variable objects. The primary
science driver is to understand the pulsational properties of the RR
Lyrae, cepheids and AGB variables and to link these to the (spatially
resolved) Star Formation History of these galaxies. The secondary
science goals include the analysis of other classes of pulsational
variables and the selection of detached eclipsing binaries for
follow-up studies.
Other uses include the analysis of the galaxies' colour-magnitude
diagram (the co-added data with reach 5sigma limiting magnitudes of
about K= 22.1 and Z= 24.6), study of the galactic foreground
population, including proper motion studies, and quasar variability.
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