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    Beta Pic-like circumstellar disk gas surrounding HR 10 and HD 85905

    Welsh, B.Y. and Craig, N. and Crawford, Ian and Price, R.J. (1998) Beta Pic-like circumstellar disk gas surrounding HR 10 and HD 85905. Astronomy & Astrophysics 338 (2), pp. 674-682. ISSN 0004-6361.

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    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.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: Sarah Hall
    Date Deposited: 13 Aug 2019 11:59
    Last Modified: 02 Aug 2023 17:53


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