Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-06-28
Astrophys.J. 539 (2000) L55-L58
Astronomy and Astrophysics
Astrophysics
To appear in the Astrophysical Journal Letters; 8 pages, 2 figures; coded with AAS latex style
Scientific paper
10.1086/312834
We report on the R-band eclipse mapping analysis of high-speed photometry of the dwarf nova EX Dra on the rise to the maximum of the November 1995 outburst. The eclipse map shows a one-armed spiral structure of ~180 degrees in azimuth, extending in radius from R ~0.2 to 0.43 R_{L1} (where R_{L1} is the distance from the disk center to the inner Lagrangian point), that contributes about 22 per cent of the total flux of the eclipse map. The spiral structure is stationary in a reference frame co-rotating with the binary and is stable for a timescale of at least 5 binary orbits. The comparison of the eclipse maps on the rise and in quiescence suggests that the outbursts of EX Dra may be driven by episodes of enhanced mass-transfer from the secondary star. Possible explanations for the nature of the spiral structure are discussed.
Baptista Raymundo
Catalan Maria S.
No associations
LandOfFree
A spiral structure in the disk of EX Draconis on the rise to outburst maximum 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 A spiral structure in the disk of EX Draconis on the rise to outburst maximum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A spiral structure in the disk of EX Draconis on the rise to outburst maximum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-592291