Journal Article

Detection of a strong transient blueshifted absorption component in the ß Pictoris disc

I. A. Crawford, H. Beust and A. -M. Lagrange

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 2, pages L31-L34
Published in print February 1998 | ISSN: 0035-8711
Published online February 1998 | e-ISSN: 1365-2966 | DOI:
Detection of a strong transient blueshifted absorption component in the ß Pictoris disc

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We present high-resolution spectra (1.0 km s-1 FWHM) of the circumstellar Ca K line towards ß Pictoris obtained on 1997 June 19 and 20. On the former date a strong absorption component was found at a heliocentric velocity of vhelio = +8 km s-1, that is blueshifted by 14 km s-1 with respect to the main, ‘stable’, circumstellar component at vhelio = +22 km s-1. To our knowledge, this is the first detection of a blueshifted Ca ii 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 vhelio = +54 km s-1 which was absent on the previous night. The implications of these observations for the evaporating ‘comet’ model of spectral variations in the ß Pictoris disc are discussed.

Keywords: line: profiles; circumstellar matter; stars: individual: ß Pic

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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