Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.6210b&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #62.10; Bulletin of the American Astronomical Society, Vol. 25, p.904
Astronomy and Astrophysics
Astronomy
Scientific paper
Archival high dispersion IUE spectra have been used to search for UV circumstellar absorption features in the protoplanetary system candidate, alpha PsA (Fomalhaut). Recent sub-mm mapping of the region about alpha PsA has indicated a spatially resolved dust disk like that around beta Pic. To determine how closely this object resembles beta Pic, we examined the available IUE data. Previous results by Bruhweiler & Kondo (1981) revealed what was identified as interstellar C I toward this nearby (7 pc) object. Examination of summed spectra with both the Short Wave and Long Wave Prime (SWP & LWP) cameras finds no convincing evidence for circumstellar absorption from the species C I, S I, Mg I, Mg II, Fe II, Fe III, or Al III. Based upon results from infrared and mm wavelengths specifying the aspect for the disk, the IUE observations suggest that, if a gas disk is present, it is thin with a limited scale-height. If the collisionally ionized non-photospheric Al III seen in beta Pic is formed close to the stellar surface, the absence of this species in the UV spectrum of Fomalhaut could imply that, in contrast with beta Pic, no active gaseous disk infall onto the central star is now occurring.
Bruhweiler Fred
Cheng Kwang-Peng
Kondo Yoshihiko
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