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Astron. Astrophys. 338, 674-682 (1998)


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[FORMULA] Pic-like circumstellar disk gas surrounding HR 10 and HD 85905

B.Y. Welsh 1, N. Craig 2, I.A. Crawford 3 and R.J. Price 3

1 Experimental Astrophysics Group, Space Sciences Laboratory, UC Berkeley, Berkeley, CA 94720, USA
2 Center for EUV Astrophysics, UC Berkeley, Berkeley, CA 94720 USA
3 Department of Physics and Astronomy, University College London, Gower St, London WC1E 6BT, UK

Received 24 June 1998 / Accepted 16 July 1998

Abstract

We present high spectral resolution observations of the absorption lines of CaII and NaI associated with the circumstellar gas disk surrounding the two A-type shell stars HR 10 and HD 85905. Data taken over two four-night periods in January and November 1997 reveal substantial changes in the circumstellar absorption line profiles between successive observations of both stars. Such variable features have both blue and red-shifted velocities up to 50 km s-1 away from the central absorbing component, and are similar to those routinely observed in the [FORMULA] Pictoris system. The sporadic presence of the circumstellar absorption components observed towards both HR 10 and HD 85905 may be explained by the infalling evaporating comet model developed for the [FORMULA] Pictoris system by Beust et al. (1990). We note that variable circumstellar absorption features have also been detected in rapidly rotating A-type stars, such that they may be suffering irregular mass-loss that could give rise to similar circumstellar disks and shells.

Key words: circumstellar matter – stars: individual: fi Pic – stars: individual: HD 85905 – stars: individual: HR 10


© European Southern Observatory (ESO) 1998

Online publication: September 14, 1998

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