Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.1306n&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #13.06; Bulletin of the American Astronomical Society, Vol. 33, p.1328
Astronomy and Astrophysics
Astronomy
Scientific paper
We have used infrared, visual, and ultraviolet observations to study the circumstellar environments of all nearby A stars. We have been looking for stars with circumstellar dust disks and/or gas infall/outflow similar to that seen around the proto-planetary system candidate β Pictoris. Among the 62 A stars in our survey, the most interesting object so far is 2 Andromedae (HD 217782). Our ultraviolet spectra revealed the existence of circumstellar as well as interstellar gas along this line-of-sight (d=107.2 pc; l=102.5o). We also detected variable, redshifted Ca II K absorption features in our ground-based visual spectra. These variable circumstellar Ca II absorption features and the presence of Al III and Fe II circumstellar absorption lines in our HST/GHRS spectra of 2 And are similar to those observed in the β Pictoris. However, unlike β Pic, 2 And has no detectable infrared excess in our IRAS dust survey of nearby A stars. In order to better constrain the characteristics and origin of the circumstellar gas, we observed 2 And with FUSE for 20 kiloseconds on 3 and 4 July 2001. Our FUSE spectrum shows a well-exposed continuum longward of 1100 Å \ with a wealth of photospheric, interstellar, and circumstellar absorption lines. We did not detect any broad, strong stellar Al III or O VI emission lines like those seen in the FUSE spectrum of β Pic. This work is supported by NASA grant NAG5-10313 to the College of Charleston and NASA grant NAG5-10312 and NSF grant AST-9819737 to California State University/Fullerton.
Cheng Kwang-Peng
Neff James E.
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