Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294l..31c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 294, p. L31-L34
Astronomy and Astrophysics
Astronomy
14
Stellar Envelopes, Infrared Astronomy Satellite, Red Shift, Line Spectra, Absorption Spectra
Scientific paper
We present high-resolution spectra (1.0 km/s FWHM) of the circumstellar Ca K line towards Beta Pictoris obtained on 1997 June 19 and 20. On the former date a strong absorption component was found at a heliocentric velocity of V(helio) = +8 km/s, which is blueshifted by 14 km/s with respect to the main, 'stable', circumstellar component at V(helio) = +22 km/s. To our knowledge, this is the first detection of a blueshifted CaII component with a strength comparable to the more frequently observed redshifted events. On the following night a blueshifted component was still present, but its strength had decreased significantly; in addition, a strong redshifted component had appeared at V(helio) = +54 km/s which was absent on the previous night. The implications of these observations for the evaporating 'comet' model of spectral variations in the Beta Pictoris disk are discussed.
Beust Hervé
Crawford Ian A.
Lagrange Anne Marie
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