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NAM2012 - All Presentation Details

Record 734 of 756

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Deep optical surveys in search for accreting compact binaries

Author: Sandra Greiss

The University of Warwick


Session: STA2: Binary Stars: Duplicity is Everywhere

Presentation type: Talk      12:00  Friday 30th 11:45-13:00 


White dwarfs, either accreting from non-degenerate companions, or coalescing with a second white dwarf, are thought to be the progenitors of Type Ia supernovae. Our knowledge of the galactic white dwarf population has increased substantially thanks to large sky surveys such as SDSS. However, the understanding of their formation and evolution remains incomplete. It is therefore crucial to expand the known sample of white dwarf binaries, as well as that of related types of compact binaries. Here we focus on The European Galactic Plane Surveys collaboration (EGAPS), a deep optical survey of the entire galactic plane in Ugri and H-alpha. It is an ideal location to detect compact binaries, whether CVs, double-degenerates, or LMXBs, as the density of these systems is highest in the plane, and confusion with background quasars and hot OB stars is suppressed by extinction. In addition, most if not all, accreting binaries are H-alpha emitters, therefore they stand out clearly in colour-space. Slightly away from the Galactic Plane, at lower extinction, lies the Kepler field. It is the target of the most intensive search for transiting planets to date. Despite the fact that the Kepler mission provides the best ever time series photometry, with an enormous impact on all areas of stellar variability, its field lacks deep optical photometry necessary for selecting various classes of targets such as hot, young, or active stars, white dwarfs or subdwarfs, and accreting objects. For this reason, we make use of the available EGAPS observing strategy and pipeline to produce a deep optical survey of the Kepler field in Ugri and H-alpha, down to 21st mag. Here, we present the initial data release of the catalogue and the type of interesting objects which are expected to be discovered in this region.

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