Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-15
Mon.Not.Roy.Astron.Soc.372:1129-1132,2006
Astronomy and Astrophysics
Astrophysics
4 pages 2 figures. MNRAS submitted Final proofread version. Discussion modified with figure showing fits and residuals to mode
Scientific paper
10.1111/j.1365-2966.2006.10920.x
We have measured the orbital light curve of dwarf nova OY Carinae on 8 separate occasions 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 +- 5 s earlier than that predicted by the Wood et al.(1989) ephemeris. Using the times of eclipse from our measurements and the compilation of published measurements by Pratt et al (1999) we find that the observational data are inconsistent with a constant period and indicate that the orbital period is decreasing by 5+-1 X 10^-12 s/s. This is too fast to be explained by gravitational radiation emission. It is possible that the change is cyclic with a period greater than about 80 years. This is much longer than typical magnetic activity cycles and may be due to the presence of a third object in the system. Preliminary estimates suggest that this is a brown dwarf with mass about 0.016 Msun and orbital radius >= 17 AU.
Dieters Stefan
Fienberg K.
Greenhill John G.
Hill Kym M.
Howlett M.
No associations
LandOfFree
Decrease in the orbital period of dwarf nova OY Carinae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Decrease in the orbital period of dwarf nova OY Carinae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decrease in the orbital period of dwarf nova OY Carinae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-254517