RAT J1953+1859: a dwarf nova discovered through high amplitude QPOs in quiescence
Ramsay, G.; Hakala, P.; Barclay, T.; Wheatley, P.J.; Marshall, G.; Lehto, H.; Napiwotzki, R.; Nelemans, G.; Potter, S.; Todd, I.
Citation: Ramsay , G , Hakala , P , Barclay , T , Wheatley , P J , Marshall , G , Lehto , H , Napiwotzki , R , Nelemans , G , Potter , S & Todd , I 2009 , ' RAT J1953+1859: a dwarf nova discovered through high amplitude QPOs in quiescence ' Monthly Notices of the Royal Astronomical Society , vol 398 , no. 3 , pp. 1333-1338 .
We report the discovery of an accreting binary, RAT J1953+1859, made during the RApid Temporal Survey (RATS) on the Isaac Newton Telescope. It showed high amplitude (0.3 mag) quasi-periodic oscillations on a time-scale of ∼20 min. Further observations made using the Nordic Optical Telescope showed it to be ∼4 mag brighter than in the discovery images. These photometric observations, together with radial velocity data taken using the William Herschel Telescope, point to an orbital period of ∼90 min. These data suggest that RAT J1953+1859 is a dwarf novae of the SU UMa type. What makes RAT J1953+1859 unusual is that it is the first such system to be discovered as a result of high amplitude QPOs during quiescence. This suggests that high-cadence wide-field surveys could be another means to discover cataclysmic variables as a result of their short period variability.
‘The definitive version is available at www3.interscience.wiley.com '. Copyright Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2009.14982.x