Excitation of trapped oscillations in dwarf-nova accretion disks

Details Excitation of trapped oscillations in dwarf-nova accretion disks Excitation of trapped oscillations in dwarf-nova accretion disks

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47...59y&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 47, no. 1, p. 59-71

Computer Science

Sound

8

Accretion Disks, Dwarf Novae, Oscillations, Periodic Variations, Stellar Composition, Stellar Models, Stellar Structure, Thermal Stability, Trapped Particles, Cataclysmic Variables, Sound Waves, Stellar Luminosity, Viscosity

Scientific paper

As a possible mechanism for quasi-periodic oscillations (QPOs) of dwarf novae during outbursts, axially symmetric radial oscillations of accretion disks are investigated. According to the thermal-instability scenario, the dwarf-nova disk in the decay from outbursts consists of inner, vertically expanded hot regions and outer cool regions. We first show that acoustic waves with a narrow range of frequencies, once excited, can be trapped just inside the transition front between the inner hot and outer cool regions. This contrasts with the usual case of standard-disk configurations in which waves cannot be trapped. We then examine the stability of the disk by adopting the conventional alpha-viscosity, finding that trapped oscillations can grow by viscous and thermal processes, which produce quasi-periodic light variations. The QPO frequency is, however, expected to increase by a factor of approximately 4 as the disk luminosity decreases, which has not yet been observed.

Affiliated with

Also associated with

No associations

Rating

Excitation of trapped oscillations in dwarf-nova accretion disks 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 Excitation of trapped oscillations in dwarf-nova accretion disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excitation of trapped oscillations in dwarf-nova accretion disks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1823986