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18 April 2024 |
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Article overview
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The OmegaWhite Survey for short period variable stars II: An overview of results from the first four years | | Ruxandra Toma
; Gavin Ramsay
; Sally MacFarlane
; Paul Groot
; Patrick Woudt
; Vik Dhillon
; C. Simon Jeffery
; Tom Marsh
; Gijs Nelemans
; Danny Steeghs
; | | Date: |
18 Aug 2016 | | Abstract: | OmegaWhite is a wide-field, high cadence, synoptic survey targeting fields in
the southern Galactic plane, with the aim of discovering short period variable
stars. Our strategy is to take a series of 39 s exposures in the g band of a 1
square degree of sky lasting 2 h using the OmegaCAM wide field imager on the
VLT Survey Telescope (VST). We give an overview of the initial 4 years of data
which covers 134 square degrees and includes 12.3 million light curves. As the
fields overlap with the VLT Survey Telescope Halpha Photometric Survey of the
Galactic plane and Bulge (VPHAS+), we currently have $ugriHalpha$ photometry
for ~1/3 of our fields. We find that a significant fraction of the light curves
have been affected by the diffraction spikes of bright stars sweeping across
stars within a few dozen of pixels over the two hour observing time interval
due to the alt-az nature of the VST. We select candidate variable stars using a
variety of variability statistics, followed by a manual verification stage. We
present samples of several classes of short period variables, including: an
ultra compact binary, a DQ white dwarf, a compact object with evidence of a 100
min rotation period, three CVs, one eclipsing binary with an 85 min period, a
symbiotic binary which shows evidence of a 31 min photometric period, and a
large sample of candidate delta Sct type stars including one with a 9.3 min
period. Our overall goal is to cover 400 square degrees, and this study
indicates we will find many more interesting short period variable stars as a
result. | | Source: | arXiv, 1608.5280 | | Services: | Forum | Review | PDF | Favorites | |
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