Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1057r&link_type=abstract
American Astronomical Society, DPS meeting #30, #23.P10; Bulletin of the American Astronomical Society, Vol. 30, p.1057
Astronomy and Astrophysics
Astronomy
Scientific paper
Spectra of Beta Pictoris were obtained on Dec. 6, 1997 and Dec. 19, 1997, using the Echelle mode of the Space Telescope Imaging Spectrograph (STIS). These data cover the wavelength range from 1459 Angstroms to 2888 Angstroms and exhibit many circumstellar atomic absorption features, including CI and FeII. The CO A-X (0-0,1-0,2-0) bands were also observed, including the bands arising from (13) CO. Preliminary analysis of the CO bands and of the CI 1561 Angstroms and 1657 Angstroms multiplets has been completed. Also analyzed were two lines arising from the metastable (1) D state of the ground configuration of CI, at 1463 Angstroms and 1931 Angstroms. The CI features show the multiple velocity component structure previously observed in HST-GHRS spectra of Beta Pictoris (Jolly et al., A&A 329, 1028 (1998)) and attributed to dissociation of CO evaporating from cometary bodies orbiting the star at different velocities and locations. Velocities and turbulent Doppler widths obtained from the FeII lines were used to aid the modeling of the highly saturated CI multiplets. The CI features show significant variation between the two days of observation; the total column density of ground state C((3) P) is approximately 3-5 x 10(15) cm(-2) . The total column density of C((1) D) is approximately 3-6 x 10(13) cm(-2) .
Debes John H.
Feldman Paul D.
Jolly Alison
Lagrange Anne Marie
McPhate Jason B.
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