Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.2502r&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #25.02; Bulletin of the American Astronomical Society, Vol. 34, p.1145
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a study of gas in several young circumstellar (CS) disk systems, using UV absorption spectroscopy with HST-STIS and FUSE. The systems observed are Beta Pictoris, AB Aurigae, 51 Ophiuchi, HD 100546, and HD 163296. This study focusses on molecular gas abundances and star-grazing planetesimals, and shows that the characteristics of the CS gas can aid in the evolutionary classification of disk systems. CS molecular gas abundances, which have been the subject of considerable recent controversy, may also provide information on the composition of extrasolar planetesimals. Important results on the individual systems are listed below. The primordial disk system AB Aurigae is surrounded by a diffuse envelope of gas and dust, a remnant of the molecular cloud that collapsed to form the star. Carbon monoxide and CI are observed in the Beta Pic debris disk; when compared to the lack of molecular hydrogen gas, this indicates that the CO gas is produced by evaporation of icy, comet-like planetesimals. Volatile-depleted or metal-rich CS gas is seen infalling toward the star in spectra of 51 Oph; this gas is likely produced by vaporization of star-grazing planetesimals. Analysis of the transitional disk systems HD 100546 and HD 163296 shows extraordinary hot, dense molecular hydrogen near these stars.
Bouret Jean-Claud
Deleuil Magali
Feldman Paul D.
Lecavelier Des Etangs Alain
Roberge Aki
No associations
LandOfFree
Ultraviolet Spectroscopy of Circumstellar 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 Ultraviolet Spectroscopy of Circumstellar Disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultraviolet Spectroscopy of Circumstellar Disks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1889683