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Astron. Astrophys. 350, L51-L54 (1999)

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Letter to the Editor

HST/NICMOS2 observations of the HD 141569 A circumstellar disk *

J.C. Augereau 1, A.M. Lagrange 1, D. Mouillet 1 and F. Ménard 1,2

1 Laboratoire d'Astrophysique de l'Observatoire de Grenoble, Université J. Fourier / CNRS, B.P. 53, 38041 Grenoble Cedex 9, France
2 Canada-France-Hawaii Telescope Corporation, PO Box 1597, Kamuela, HI 96743, USA

Received 28 July 1999 / Accepted 22 September 1999

Abstract

We report the first resolved scattered light images of the circumstellar dust disk around the old Pre-Main Sequence star HD 141569 A. The disk seen in HST/NICMOS2 images shapes a bright annulus inclined at [FORMULA] from edge-on. This ring peaks at [FORMULA] AU from the star with a characteristic width of [FORMULA] AU. At [FORMULA]m, the dust grains scatter a total flux density of at least [FORMULA] mJy. Our disk model using the spatial distribution implied by the images does not explain the [FORMULA]m excess and requires an additional grain population closer to the star. Some similarities and differences with the dust annulus surrounding HR 4796 A are pointed out.

Key words: stars: individual: HD 141569 A – stars: circumstellar matter

* Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract No. NAS5-26555.

Send offprint requests to: J.C. Augereau

Correspondence to: augereau@obs.ujf-grenoble.fr

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999
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