Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-22
Astronomy and Astrophysics
Astrophysics
12pages, LaTeX with 26 eps figures using pasj00.cls and 21 JPEG figures, to appear in PASJ Vol. 54, No.3. Preprint in PDF form
Scientific paper
We propose a new method, emission-line eclipse mapping, to map the velocity fields of an accretion disk in position space. Quiescent dwarf novae usually exhibit double-peaked emission line profiles because of disk rotation. Since a part of the disk having a different line-of-sight velocity is successively obscured by a companion in eclipsing systems, they show time-varying line profiles. We calculate time changes of the emission line profiles, assuming Keplerian rotation fields (v_\phi\propto r^(-1/2) with r being the distance from the disk center) and the emissivity distribution of j \propto r^(-3/2). We, then, apply the usual eclipse mapping technique to the light curves at each of 12-24 wavelengths across the line center to map the region with the same line-of-sight velocity. The reconstructed images typically exhibit a `two-eye' pattern for high line-of-sight velocities and we can recover the relation, v_\phi \propto d^(-1/2), on the assumption of the axisymmetric disk, where d is the separation between the two `eyes'. We will be able to probe the Keplerian rotation law, the most fundamental assumption adopted in many disk models, by high-speed spectroscopic observations with 8-m class telescopes.
Makita Makoto
Mineshige Shin
No associations
LandOfFree
Emission-Line Eclipse Mapping of Velocity Fields in Dwarf-Nova Accretion Disk 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 Emission-Line Eclipse Mapping of Velocity Fields in Dwarf-Nova Accretion Disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Emission-Line Eclipse Mapping of Velocity Fields in Dwarf-Nova Accretion Disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-402808