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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421601.0, MPI für Astronomie / Publikationen_mpia
High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FUOri disc
Authors:Kópá¡l, Á; Ábrahám, P.; Apai, D.; Ardila, D. R.; Grady, C. A.; Henning, Th; Juhász, A.; Miller, D. W.; Moó³r, A.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Monthly Notices of the Royal Astronomical Society
Start Page:1015
End Page:1028
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present the first high spatial resolution near-infrared direct and polarimetric observations of Parsamian 21, obtained with the Nasmyth Adaptive Optics System-CONICA instrument at the Very Large Telescope (VLT). We complemented these measurements with archival infrared observations, such as Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 (WFPC2) imaging, HST/Near Infrared Camera and Multi-Object Spectrometer (NICMOS) polarimetry, photometry with the Spitzer Space Telescope's Infrared Array Camera (IRAC) and Multiband Imaging Photometer (MIPS), spectroscopy with Spitzer's Infrared Spectrograph (IRS), as well as Infrared Space Observatory (ISO) photometry. Our main conclusions are as follows: (1) we argue that Parsamian 21 is probably an FUOrionis-type object (FUor); (2) Parsamian 21 is not associated with any rich cluster of young stars; (3) our measurements reveal a circumstellar envelope, a polar cavity and an edge-on disc; the disc seems to be geometrically flat and extends from approximately 48 to 360 au from the star; (4) the spectral energy distribution (SED) can be reproduced with a simple model of a circumstellar disc and an envelope; (5) within the framework of an evolutionary sequence of FUors proposed by Green et al. and Quanz et al., Parsamian 21 can be classified as an intermediate-aged object. The results published in this paper are based on data collected at the European Southern Observatory in the frame of the programme P073.C-0721(A). E-mail: kospal@konkoly.hu
Free Keywords:techniques: polarimetric; circumstellar matter; stars: individual: Parsamian 21; stars: pre-main sequence; infrared: stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008MNRAS.383.1015K [ID No:1]
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