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Astron. Astrophys. 346, 441-452 (1999)


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The circumstellar environment of IRAS 05327+3404

E.A. Magnier 1,2, L.B.F.M. Waters 1,3, P.J. Groot 1, M.E. van den Ancker 1, Y.-J. Kuan 4,5 and E.L. Martín 6,7

1 Astronomical Institute "Anton Pannekoek" and CHEAF, Kruislaan 403, 198 SJ Amsterdam, The Netherlands
2 Astronomy Dept. 351580, University of Washington, Seattle, WA 98195, USA
3 SRON Laboratory for Space Research Groningen, P.O. Box 800, 9700 AV Groningen, The Netherlands
4 Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan
5 Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 1-87, Nankang, Taipei, Taiwan
6 Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
7 Astronomy Dept., 601 Campbell Hall, University of California at Berkeley, CA 94720, USA

Received 20 February 1998 / Accepted 21 August 1998

Abstract

We continue our study of the young stellar object associated with IRAS 05327+3404. We have determined the spectral type of the central star to be K2. We show that the star is most likely seen directly, not via a reflection, and that the extinction is only [FORMULA] mag. The spectral energy distribution shows the presence of large amounts of circumstellar material. Near-IR and optical observations of the reflection nebula also demonstrate the presence of circumstellar material, and show the material to be arranged in a disk with a relatively wide central hole of [FORMULA]33o opening angle. The central hole and a CO outflow are co-aligned, and are roughly aligned with the ionized outflow. Several surprising aspects remain: Although the system has a strong ionized outflow, there is little or no evidence of active accretion in the form of UV excess, veiling, or strong high-Balmer line emission. Also, the spectral energy distribution is very wide, and suggests that the original birth cloud had a large rotational velocity. We propose that the relative isolation of the system from other star formation activity may explain the relatively large circumstellar disk for a system with a well-exposed central star.

Key words: stars: circumstellar matter – stars: evolution – stars: formation – stars: mass-loss – stars: pre-main sequence

Send offprint requests to: Eugene A. Magnier

Correspondence to: gene@astro.uva.nl

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999

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