Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4916c&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #49.16; Bulletin of the American Astronomical Society, Vol. 34, p.1187
Astronomy and Astrophysics
Astronomy
Scientific paper
The A5 star β Pictoris is a possible young planetary system with the best-studied circumstellar disk. Our visible and ultraviolet observations of 2 Andromedae indicated that this A3 star has ``β Pictoris-like'' gas infall. We present the far-ultraviolet spectrum (905 -- 1195 Å)\ of 2 And we obtained with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer (FUSE). Unlike β Pic, 2 And's FUSE spectum does not show strong chromospheric emission lines from C 3 and O 6. However, 2 And's FUSE spectrum contains many non-photospheric lines that allow us to probe the circumstellar gas. For example, between 1120 and 1140 Å,\ we detected several Fe 3 absorption lines arising from hyper-fine levels of ground state, which cannot arise in the interstellar medium and can be used as diagnostics of the circumstellar gas. We also detected circumstellar Fe 2, Cr 3, and Mn 3 lines that are sufficiently strong to allow circumstellar gas velocity determinations.
Cheng Kwang-Peng
Neff James E.
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