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Post Info TOPIC: RAT J1953+1859
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RE: RAT J1953+1859
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Title: RAT J1953+1859: a dwarf nova discovered through high amplitude QPOs in quiescence
Authors: Gavin Ramsay (1), Pasi Hakala (2), Thomas Barclay (1,3), Peter Wheatley (4), George Marshall (4), Harry Lehto (2), Ralf Napiwotzki (5), Gijs Nelemans (6), Stephen Potter (7), Ian Todd (8), ((1) Armagh Observatory, (2) Tuorla Observatory, (3) MSSL/UCL, (4) Univ Warwick, (5) Univ Herts, (6) Radboud Univ Nijmegen, (7) SAAO, (8) Queens Univ Belfast)

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 timescale of ~20 mins. 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 mins. 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.

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Blobrana


L

Posts: 131433
Date:
Permalink  
 

Title: RAT J1953+1859: a dwarf nova discovered through high amplitude QPOs in quiescence
Authors: Gavin Ramsay, Pasi Hakala, Thomas Barclay, Peter Wheatley, George Marshall, Harry Lehto, Ralf Napiwotzki, Gijs Nelemans, Stephen Potter and Ian Todd

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 timescale of ~20 mins. 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 mins. 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.

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