Spitzer survey of dust grain processing in stable discs around binary post-AGB stars

Details Spitzer survey of dust grain processing in stable discs around binary post-AGB stars Spitzer survey of dust grain processing in stable discs around binary post-AGB stars

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phdt.........2g&link_type=abstract

PhD Thesis, Institute of Astronomy, K.U.Leuven, Belgium, 183 pages.

Astronomy and Astrophysics

Astronomy

1

Spectroscopy, Agb And Post-Agb, Binaries, Infrared, Circumstellar Matter

Scientific paper

In this work we present the results of a spectral survey of evolved stars, obtained with the IRS spectrograph aboard the Spitzer satellite. We selected 21 Galactic and 4 extragalactic LMC sources from a larger sample of evolved stars, believed to be part of a binary system and surrounded by a stable dusty disc. By combining high-spectral resolution observations with detailed models describing dust properties and disc structure, we found that the infrared spectra indeed confirm the suspected disc hypothesis, and allow us to constrain the disc composition and structure. All stars show features due to oxygen-rich dust species, specifically amorphous and crystalline silicates, with evidence for strong grain processing in the form of crystallinisation and grain growth. Two sample stars, EPLyr and HD52961, have features due to CO2 gas, and the former also shows evidence for a mixed chemistry. Detailed disc modelling indicates that all the discs are circumbinary, with a puffed-up inner rim. In general we found that the discs around these evolved binaries are very similar to the protoplanetary discs seen around YSOs. The origin and evolution of the disc is still unkown, but appears to play a significant role in the further evolution of the entire binary system, since we find evidence for a shortcut of the previous AGB evolution of our sample stars.

Affiliated with

Also associated with

No associations

Rating

Spitzer survey of dust grain processing in stable discs around binary post-AGB stars 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 Spitzer survey of dust grain processing in stable discs around binary post-AGB stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spitzer survey of dust grain processing in stable discs around binary post-AGB stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1110758