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Astron. Astrophys. 321, 888-890 (1997)


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Circumstellar disk variations around [FORMULA] Pictoris

B.Y. Welsh 1, N. Craig 2, S. Jelinsky 1 and T. Sasseen 1

1 Experimental Astrophysics Group, Space Sciences Laboratory, University of California, Berkeley, CA 94720-7450, USA
2 Center for EUV Astrophysics, Space Sciences Laboratory, University of California, Berkeley, CA 94720-5030, USA

Received 10 September 1996 / Accepted 4 November 1996

Abstract

We present high resolution spectral observations of the absorption lines of Ca II and Na I associated with the circumstellar disk surrounding the star [FORMULA] Pictoris. The observations were taken over a four night period in January 1996 and reveal substantial profile variability between successive nights. High velocity absorption features at velocities of +58 km s-1 were observed in the Ca II data, but were not present in the Na I profiles. An unusually high Ca II : Na I ratio of [FORMULA] 150:1 was found for the central, stable [FORMULA] km s-1 component.

Key words: stars: circumstellar matter – stars: fi Pic

Send offprint requests to: bwelsh@ssl.berkeley.edu

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998

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