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Decrease in the orbital period of dwarf nova OY Carinae


Greenhill, JG and Hill, KM and Dieters, S and Fienberg, KS and Howlett, M and Meijers, AJ and Munro, AIS and Senkbeil, CE, Decrease in the orbital period of dwarf nova OY Carinae, Monthly Notices of the Royal Astronomical Society, 372, (3) pp. 1129-1132. ISSN 0035-8711 (2006) [Refereed Article]

DOI: doi:10.1111/j.1365-2966.2006.10920.x


We have measured the orbital light curve of dwarf nova OY Carinae on eight separate nights between 1997 September and 2005 December. The measurements were made in white light using CCD photometers on the Mt Canopus 1-m telescope. The time of eclipse in 2005 December was 168 ± 5s earlier than that predicted by the Wood et al. ephemeris. Using the times of eclipse from our measurements and the compilation of published measurements by Pratt et al., we find that the observational data are inconsistent with a constant period and indicate that the orbital period is decreasing by 5 ± 1 × 10 -12 s s -1. This is too fast to be explained by gravitational radiation emission alone. It is possible that the change is cyclic with a period of ∼35 yr and a fractional period change "P/P = 2.6 × 10 -7. This is probably due to solar-cycle magnetic activity in the secondary. There are also large systematic deviations, with a time-scale of years, from a sinusoidal modulation. © 2006 RAS.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Greenhill, JG (Dr John Greenhill)
UTAS Author:Hill, KM (Dr Kym Hill)
UTAS Author:Dieters, S (Dr Stefan Dieters)
UTAS Author:Fienberg, KS (Mr Kurt Fienberg)
UTAS Author:Howlett, M (Mr Matthew Howlett)
UTAS Author:Meijers, AJ (Dr Andrew Meijers)
UTAS Author:Munro, AIS (Mr Angus Munro)
UTAS Author:Senkbeil, CE (Mr Cliff Senkbeil)
ID Code:40850
Year Published:2006
Web of Science® Times Cited:12
Deposited By:Physics
Deposited On:2006-08-01
Last Modified:2007-03-14

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